System Operands (SI) (SL) (SB) (SDW)

#

Description

Turns ON when:

Turns OFF when:

Reset by:

SB 0

Always 0

Never

Always

SB 1

Always 1

Always

Never

SB 2

Power-up bit

Power-up occurs, for 1 scan

Note that SB2 is limited to 800 instances per program. You can use SB2 to drive MBs and use those in your program. If you are using Enhanced Vision, note that XBs are initialized at powerup.

SB 3

1 second pulse

This is a squarewave of 1 second duration, with a 50% duty cycle

SB 4

Divide by zero

SB 5

Outputs short circuit

SB 6

Keyboard is active

SB 7

100 mS pulse

SB 8

Battery low (1=low)

The PLC continually monitors the battery. When the battery is low for a minimum of  5 second, SB 8 is set to 1.

Before checking SB 8 wait a minimum of 5 seconds after turning on the controller.

Reset at power-up

SB9

RAM failure :Bit value is not 0 or 1

Battery needs to be replaced, or RAM has failed

Battery and RAM are functioning

Reset by user:

via info, or Communication

SB 10

Float Error

By OS when the result of a float operation is an illegal float value.

Error code is in SI440.

By user, or at power-up.

SB 11

User Stack Overflow

SB 13

ON at Rising Edge of SB3 (1sec pulse)

Turns ON when SB3, 1 second pulse, rises

OS

SB 14

Calculate current controller temperature (not supported by V120/130/350)

By user.

When SB 14 turns ON, the value in SI 14, Current Controller Temperature updates.

By OS

OS

SB 15

ON at Rising Edge of SB7 (100 mS pulse)

Turns ON when SB7, 100mS second pulse, rises

OS

#

Description

Turns ON when:

Turns OFF when:

Reset by:

SB 16

Touchscreen Active

Touchscreen is actually being touched

Note that the touch property must be assigned to a variable. If this property is assigned, touching the variable activates it, causing it to be marked by the blinking cursor.

The screen is not being touched.

OS

SB 17

Enable/Disable Touch-screen indication, Message Board function

User turns ON to enable a message to be handwritten on the touch-screen with a stylus

User turns it off.

User

SB 22

Enable Virtual Keypad

(Relevant only to Standard Vision + Touchscreen, not Enhanced))

• ON by default in Touchscreen-only models (V290). Causes a Virtual Touchscreen to be shown on screen when the user touches a display entry variable. .

• In Touchscreen + HMI keypad models (V280), user turns ON to enable Virtual keypad. When ON, the normal alphanumeric keypad is suspended.

• Off by default in all models with physical; keypad

• May be turned OFF by user.

User/ OS

#

Description

Turns ON when:

Turns OFF when:

Reset by:

SB 26

Exiting OS Draw Mode (ON for 1 cycle after OS draw)

OS Draw Mode means that the controller's Operating System takes control of the LCD screen:

• During Info Mode

• When a Display is entered

• When the Virtual Keypad (touch-screen models) is displayed

• When 'Symbols' are displayed during Keypad Entry.

Turns ON for a single cycle when SB 28 turns OFF. This happens at the following times:

• When the PLC exits Info Mode.

• Rises the cycle after a Display is entered.

• When Virtual Keypad mode exits.

• After 'Symbols' are displayed during Keypad Entry.

At all other times

OS

SB 27

Enter Display without active Keypad Entry Variables
If SB 27 is ON when a Display is shown:

• The user cannot navigate through the variables using the Enter or Right-arrow keys.

• No Keypad Entry Variable will be marked by the blinking cursor. In this case, a variable may be activated by:

• Touch (V280 only)--assuming it has been assigned the Touch property.

• By writing the variable ID # into SI 250, either via Info or Online mode.

By program

By program

SB 28

LCD controlled by OS (OS drawing)

OS Draw Mode means that the controller's Operating System takes control of the LCD screen:

• During Info Mode

• When a Display is entered

• When the Virtual Keypad (touch-screen models) is displayed

• When 'Symbols' are displayed during Keypad Entry.

• ON when the PLC is in Info Mode.

• ON when 'Symbols' are displayed during Keypad Entry.

• Rises when a Display is entered.

• In V290, which uses a virtual screen keyboard, SB 28 is always ON.

• PLC exits Info Mode

• After a Display is entered.

OS

SB 29

Current keypad entry sets SB 30 (HMI keypad entries complete)
Turn SB 29 ON after data is keyed into any variable, enabling the user to skip keying in data for all of the variables on-screen.  

Also refreshes all Display variables on-screen

By program

By program

OS

SB 30

HMI keypad entries completed  
When a variable is active, pressing the Enter button on the keypad signals that the user has finished entering the value.

Note ♦ Turning this SB OFF, via SB31, enables the variables to be reactivated.

Turns ON when:

• Turns ON when:

• When the Enter button has been pressed for each Variable, SB 30 turns ON.

• By program

• By SB29, by program

Turns OFF when:

• SB31 turns ON

• When PLC is initialized

OS

SB 31

Refresh current LCD screen display variables

Turning this ON reloads the display, initializing all Keypad Entry variables.

OS

SB 32

HMI keypad entry in progress

OS

SBs 33 and 34 function when an HMI Display that calls a subroutine is loaded/unloaded from the display screen.

Note ♦ ASCII String Display: In cases where a Display contains a Display ASCII String Variable, and the linked subroutine contains the Display String 'trigger' MB, you can reset this MB when the Display unloads by using the falling edge of SB 34.

SB 33

Load Display with linked Call Subroutine

 - Use this SB to initialize operands in the HMI subroutine.

 - Do not link this SB to a positive or negative transitional contact.

When a Display containing a Call Subroutine starts loading, SB 33 turns ON for a single scan cycle the first time the linked subroutine runs.

OS

SB 34

UnLoad Display with linked Call Subroutine

When a Display containing a Call Subroutine starts unloading, SB 34 turns ON for a single scan cycle the last time the linked subroutine runs.

OS

#

Description

Turns ON when:

Turns OFF when:

Reset by:

SB 35

OnLine Test Point

During OnLine mode, Single Scan, when more than 1 instance of OnLine Test Point is activated (receives RLO).

One or none instances are activated

Note that the presence of function keys is model-dependant.

#

Description

Turns ON when:

Turns OFF when:

Reset by:

SB 40

Key: # 0  

Key is pressed/held down

Key is released

OS

SB 41

Key: # 1

SB 42

Key: # 2  

SB 43

Key: # 3  

SB 44

 Key: # 4

SB 45

Key: # 5

SB 46

Key: # 6

SB 47

Key: # 7

SB 48

Key: # 8

SB 49

Key: # 9

SB 50

Plus/Minus

SB 51

Left Arrow

SB 52

Right Arrow

SB 53

ENTER

SB 54

<i> (ON when in Info mode, may be turned ON in order to enter Info, via Remote Access or user program)

SB 55

Up

SB 56

Down

SB 57

ESC

SB 58

F1

SB 59

F2

SB 60

F3

SB 61

F4

SB 62

F5  

SB 63

F6

SB 64

F7

SB 65

F8

SB 66

F9

SB 67

F10

SB 68

F11

SB 69

F12

SB 70

F13

SB 71

F14

SB 72

F15

Note that the presence of function keys is model-dependant.

#

Description

Turns ON when:

Turns OFF when:

Reset by:

SB 73

Disable HMI cursor blinking (Turn ON to disable blinking)

By user program

By user program

By user program

#

Description

Turns ON when:

Turns OFF when:

Reset by:

SB 75

Download Complete, PLC and HMI applications

When Download is finished, Turns ON for single scan ; PLC can then run application

The scan after Download ends

OS

#

Description

Turns ON when:

Turns OFF when:

Reset by:

SB 76

Keypad Entry: Focus (V130)

If SB 76 is OFF after Keypad Entry, the user must use the arrow keys to move to the next variable in the Variable Tab Order

If SB 76 is ON, the user moves to the next variable by pressing the Enter button twice:

 - Once to 'approve' the value

 - Once to jump to and open the next variable for data entry.

To enable the user to press Enter once, to both jump to and to automatically open the next variable for data entry, turn ON both SB76 and  SB108 (Press "Enter" 1x)
Note that the user can press ESC to exit keypad entry mode.

By user

By user

By user, or at Power-up

Each port is linked to an SB indicating modem communication status. These can be used as a condition to sending new messages.

#

Description

Turns ON when:

Turns OFF when:

Reset by:

SB 77

Modem 'Busy': COM Port 1

Port is busy transmitting or receiving

Port is free

OS

SB 78

Modem 'Busy': COM Port 2

SB 79

Modem 'Busy': COM Port 3

Each port is linked to 2 SBs indicating COM Port/Modem initialization status following COM Init.

Both SBs are initialized to OFF by the OS, at Power-up and at the beginning of COM Init process. When COM Init is complete, one is ON, the other OFF.

#

Description

SB 80

Modem Initialized: COM Port 1

Example: COM Port 1

SB 81

COM Port/Modem Initialization Failed: COM Port 1

SB 80

SB 81

SB 82

Modem Initialized: COM Port 2

0

0

After Power-up, before COM Init

SB 83

COM Port/Modem Initialization Failed: COM Port 2

0

1

Modem Initialization attempt failed, Modem is not initialized

SB 84

Modem Initialized: COM Port 3

1

0

Modem Initialization attempt succeeded, Modem is initialized.

SB 85

COM Port/Modem Initialization Failed: COM Port 3

1

1

Not possible

Each port is linked to an SB indicating modem connection status. These can be used in conjunction with SBs 132-137, which indicate indicating whether incoming or outgoing data is flowing through the port, to troubleshoot problems as shown in the Help topic Modem Troubleshooting.

#

Description

Turns ON when:

Turns OFF when:

Reset by:

SB 86

Modem Connection Status: COM Port 1

PLC receives 'Connect' string from modem

• Hang-up

• PLC receives string 'No Carrier'

• PLC receives break signal

OS, at Power-up

SB 87

Modem Connection Status: COM Port 2

SB 88

Modem Connection Status: COM Port 3

See Help topic Detecting short-circuited end devices

#

Description

Turns ON when:

Turns OFF when:

Reset by:

SB 91

I/O Exp. Module--Command buffer is full

ON when commands cannot be sent to the I/O module.

OFF when commands can be sent to the I/O module.

#

Description

Turns ON when:

Turns OFF when:

Reset by:

SB 100

GPRS modem connected

• Call Remote device begins.

• GPRS incoming call is answered.

• End Session succeeds.

• Disconnect from Network succeeds.

OS

#

Description

Turns ON when:

Turns OFF when:

Reset by:

SB 104

Enable MODBUS over GPRS COM 1

Must be set by user, before the MODBUS Configuration

User

User

SB 105

Enable MODBUS over GPRS COM 5

SB 106

Enable MODBUS over GPRS COM 6

#

Description

Turns ON when:

Turns OFF when:

Reset by:

SB 102

MODBUS Read long: Transpose 16 bits of 32-bit long

By User program

• By default

• By User Program

User

#

Description

Turns ON when:

Turns OFF when:

Reset by:

SB 108

Press "Enter" 1x (V130)

If BOTH SB76 and SB108 are ON, after entering a keypad value, the user needs to press Enter only once, to approve the value, and to automatically jump to and open the next variable for data entry.

Note that the user can press ESC to exit keypad entry mode.

By user

By user

By user

When a user enters a value via keypad, by default pressing the Left/Right arrows jumps between the keypad entry fields. To use the Up/Down arrows instead, set SB 109 to 1.

#

Description

Turns ON :

Turns OFF :

Reset by:

SB 109

V130 only.
Arrow keys tab between keypad entry fields: 0 = Left/Right, 1= Up/Down

User Program

Default.

User Program

User

#

Description

Turns ON when:

Turns OFF when:

Reset by:

SB 110

Draw: Out of Range

The OS attempts to draw a line or pixel outside of the legal limits of the controller's LCD.

At the beginning of every cycle

OS

When this is ON, the Virtual Keypad is disabled but the physical Keypad is enabled (V560)

#

Description

Turns ON :

Turns OFF :

Reset by:

SB 111

V560 only.
Disable Virtual Keypad

User Program

Default.

User Program

User

#

Description

Turns ON :

Turns OFF :

Reset by:

SB 112

On-Board USB port detected

OS

Each one of the V130 keypad keys 2 to 9 are marked with both letters and numbers. For example, Key 2 is marked with the numeral 2, and by the letters abc. By default, at keypad entry, the a single keypress enters '2', two key presses enter 'a', three enter 'b', and so on.
 In order to cause the letter 'a' to be selected by a single keypress, turn SB 115 ON. This reverses the number-letter order to letter number, and in the case of Key 1, reverses number-symbol to symbol-number.

#

Description

Turns ON :

Turns OFF :

Reset by:

SB 115

V130 only. Reverse key letter/number order

User Program

Default.

User Program

User

#

Description

Turns ON :

Turns OFF :

Reset by:

SB 112

On-Board USB

Set to "1" when PLC contains a built-in USB port

OS

OS

SB 113

USB cable - Connected to PC

set to "1" when connected

OS

OS

When you save a Trend to an SD card, each time you start and stop the save, another segment is added to the .utr file.

#

Description

Turns ON :

Turns OFF :

Reset by:

SB 116

SD Trends to SD: Set to Overwrite .utr

User application

User application

User

Use these to control the display of Trend segments on the HMI screen. Use the inverted contact of SB119 as a condition.

SB 117

SD Trends: Jump to next segment

User application

User application

User

SB 118

SD Trends: Jump to previous segment

User application

User application

User

SB 119

SD Trends: System busy - Draw Trend is gathering data

User application

User application

User

SBs 120-125 register the signals that each port receives from the DTR and DSR pins of a serial communication cable.

The DTR SBs 120, 122, and 124 are also used by the OS to control the DTR signal during RS485 serial communications, and during GPRS communications using the Sony Ericsson GPRS modem.

#

Description

Turns ON when:

Turns OFF when:

Reset by:

SB 120

DTR COM Port 1 (signal output from PLC)

DTR signal present

DTR signal absent

OS, may also be reset by user

SB 121

DSR COM Port 1 (signal input to PLC)

DSR signal present

DSR signal absent

OS

SB 122

DTR COM Port 2 (signal output from PLC)

DTR signal present

DTR signal absent

OS, may also be reset by user

SB 123

DSR COM Port 2 (signal input to PLC)

DSR signal present

DSR signal absent

OS

SB 124

DTR COM Port 3 (signal output from PLC)

DTR signal present

DTR signal absent

OS, may also be reset by user

SB 125

DSR COM Port 3 (signal input to PLC)

DSR signal present

DSR signal absent

OS

Each port is linked to 2 SBs indicating when incoming or outgoing data is flowing through the port. To troubleshoot problems, use these in conjunction with the Modem Connection Status SBs 86-88, as shown in the topic Modem Troubleshooting.

#

Description

Turns ON when:

Turns OFF when:

Reset by:

SB 132

COM Port 1, Data Transmission

During data send

When data is not being sent

OS

SB 133

COM Port 2, Data Transmission

SB 134

COM Port 3, Data Transmission

SB 135

COM Port 1, Data Receive

During data reception

When data is not being received

OS

SB 136

COM Port 2, Data Receive

SB 137

COM Port 3, Data Receive

#

Description

Turns ON :

Turns OFF :

Reset by:

SB 140

Remote Access - Read Only

User application
When ON, PLC ignores requests from Remote Access and Remote Operator

User application

User

Note ♦

The Vision700 controller series comprises a built in Ethernet port, and many of the Ethernet system operands listed below do not apply to the V700.

Please check the topic Vision700 - Using Ethernet for complete information.

#

Description

Turns ON when:

Turns OFF when:

Reset by:

Comments

SB 141

Ethernet: Card Exists

Ethernet card is found

No Ethernet card is installed

When the Ethernet: Card Initialization FB runs, the PLC checks whether an Ethernet card is installed.

SB 142

Ethernet: Card Initialized

Ethernet card initialization succeeds

Ethernet card initialization fails

SB 143

Ethernet: Socket 0 Initialized

Socket 0 initialization succeeds

Socket 0 initialization fails

SB 144

Ethernet: Socket 1 Initialized

Socket 1 initialization succeeds

Socket 1 initialization fails

SB 145

Ethernet: Socket 2 Initialized

Socket 2 initialization succeeds

Socket 2 initialization fails

SB 146

Ethernet: Socket 3 Initialized

Socket 3 initialization succeeds

Socket 3 initialization fails

SB 147

Ethernet: Socket 0 Connected

Connection established via Socket 0

Socket 0 is free

SBs 147-150 turn ON when:

• Link exists

• Ethernet Card initialization complete

• Socket initialization complete

• Hardware TCP/IP Socket state is Connection Established

SB 148

Ethernet: Socket 1 Connected

Connection established via Socket 1

Socket 1 is free

SB 149

Ethernet: Socket 2 Connected

Connection established via Socket 2

Socket 2 is free

SB 150

Ethernet Status: Socket 3 Connected

Connection established via Socket 3

Socket 3 is free

SB 151

Ethernet Link: Communication established

A link exists (cable plugged in)

No link exists (cable disconnected)

This refers to the physical Ethernet cable

SB 152

Ethernet Link: 10baseT

When a 10baseT link is detected, during data transmit/ receive.

When a 10baseT link is not detected, during data transmit/ receive.

SB 153

Ethernet Link: 100baseT

When a 100baseT link is detected, during data transmit/ receive.

When a 100baseT link is not detected, during data transmit/ receive.

SB 154

Ethernet: data collision

More than one device is transmitting data over the Ethernet network

One or no devices are transmitting data over the Ethernet network

SB 155

Ethernet: Socket 0 Send in Progress

Data is being transmitted via Socket 0

Data is not being transmitted via Socket 0

SB 156

Ethernet: Socket 1 Send in Progress

Data is being transmitted via Socket 1

Data is not being transmitted via Socket 1

SB 157

Ethernet: Socket 2 Send in Progress

Data is being transmitted via Socket 2

Data is not being transmitted via Socket 2

SB 158

Ethernet: Socket 3 Send in Progress

Data is being transmitted via Socket 3

Data is not being transmitted via Socket 3

SB 159

Enable Unicast, Socket 0

Turn ON (ON by default) to enable Socket 0 for Unicast

Turn OFF  to disable Socket 0 for Unicast

SB 162

Link failed after card was properly initialized

Turns ON if link falls after Card Init

Use SB 168 to automatically re-establish the link.

SB 163

Connection is  Closed (Socket 0)

By OS, when connection is  closed

SB turns ON when Close Connection is performed. This is after Transmit / Receive buffers are empty or 1-second timeout has passed. Socket is initialized.

SB 164

Connection Closed (Socket 1)

By OS, when connection is  closed

SB 165

Connection Closed (Socket 2)

By OS, when connection is  closed

SB 166

Connection Closed (Socket 3)

By OS, when connection is  closed

SB 167

Ethernet Critical error

Turns ON at critical error

OS reads Ethernet  card registers to SI 300 - 427, then re-initializes the card. User must reset PLC

SB 168

Enable "Link lost" auto recover

Automatically retry link

Do not automatically retry (default)

SB 168 should be turned ON at power-up.

It is OFF by default to preserve backwards compatibility with applications created previous to OS 4.70 B14.

If SB 168 is ON, when the Ethernet link fails, the OS saves the Ethernet parameters and resets:

   • SB 142 Card Initialized

   • SBs 143-146 Socket initialized (Sockets 0-3)

   • SBs 147-150 Socket connected (Sockets 0-3)

When the Ethernet link is reestablished, the O/S performs CARD INIT and SOCKET INIT for all 4 sockets according to the saved parameters.

SB 169

Automatic reconnect requested, in progress (Socket 0)

At Ladder

TCP - Used as internal flags by O/S in order to perform auto reconnect (user parameters SI 107 – 110)

SB 170

Automatic reconnect requested, in progress (Socket 1)

SB 171

Automatic reconnect requested, in progress (Socket 2)

SB 172

Automatic reconnect requested, in progress (Socket 3)

SB 173

Automatic reconnect requested (Socket 0)

SB 174

Automatic reconnect requested (Socket 1)

SB 175

Automatic reconnect requested (Socket 2)

SB 176

Automatic reconnect requested (Socket 3)

#

Description

Turns ON :

Turns OFF :

Reset by:

SB 178

Profibus Card Detected

OS

When SBs180-182 turns ON, the STX, ETX, or checksum of the received message was incorrect.

SB

Description

Turns ON when:

Turns OFF when:

180

COM1 Received Message Invalid, STX/ETX/Checksum (V570, 290-C,130)

Received message is invalid

Another message is received

181

COM2 Received Message Invalid, STX/ETX/Checksum (V570, 290-C,130)

182

COM3 Received Message Invalid, STX/ETX/Checksum (V570, 290-C,130)

• Standard Vision Division
  Controllers in this division can only support a single modem. You can connect a modem to any COM port. However, note that SB 184 TX Success and SB 185 TX Failed indicate message transmission status regardless of the actual COM port connected to the modem.

• Enhanced Vision Division
  Controllers in this division can support a modem on each COM port. Each port is linked to a Succeed and Fail SB:
  COM1: SB 184 and SB 185, COM2: SB186 and SB 187, COM3: SB 188 and SB 189.

Each port has a Succeed and Fail SB. When the Send process begins from a particular COM port, for each and every message, both the Succeed and Fail SB turn OFF.

If the message is sent successfully, the bit turns ON, indicating the success or failure of that message.

If the message fails, when TimeOut is exceeded or because the modem reports an error, the bit remains OFF.

Operands that are linked by the user to SMS FBs may be found in the topic SMS Operands.

SB

Description

Turns ON when:

Turns OFF when:

184

SMS: Transmission Succeeded, COM1 (ACK)

Transmission succeeds

Transmission begins

185

SMS: Transmission Failed, COM1 (NACK)

Transmission fails

186

SMS: Transmission Succeeded, COM2 (ACK)

Transmission succeeds

187

SMS: Transmission Failed, COM2 (NACK)

Transmission fails

188

SMS: Transmission Succeeded, COM3 (ACK)

Transmission succeeds

189

SMS: Transmission Failed, COM3 (NACK)

Transmission fails

Use these together with SI 198 and 199 to write incoming SMS messages to a vector of operands. This does not affect the function of the SMS message function blocks.

#

Description

Turns ON when:

Turns OFF when:

Reset by:

SB 198

SMS Arrived, Record the Received SMS Message Length in SI 198

If SB 199 is set, , SB 198 is set when a message is received

User Program

User Program

SB 199

Save SMS to Memory Vector

User Program

#

Description

Turns ON when:

Turns OFF when:

Reset by:

SB 217

SD Card Present

An  SD Card is in the slot, and is formatted to FAT32

SD Card is not found, or is incorrectly formatted

OS

SB 218

SD Card Write Enabled

Write is enabled:  the card's write-protect lock is off

Write is disabled: the card's write-protect lock is on

OS

SB 219

SD FIFO Empty (SD Card may be Ejected)

• Power-up

• No SD Card is in Slot

• No SD requests exist

There are no SD requests pending, such as Data Table Copy/Log, Alarms, or from Info Mode

OS

#

Description

Turns ON when:

Turns OFF when:

Reset by:

SB 249

Black Background.
Applicable when a system screen such as Alarm or Info does not stretch across the entire screen.

(Relevant for Enhanced Vision only)

By user.
Takes effect when screen is refreshed.

By user.

By user.

To learn how to use these operands to communicate data, check the topic Limit Keypad Entry.

#

Description

Turns ON when:

Turns OFF when:

Reset by:

SB 250

Keypad entry within limits
(Relevant for Standard Vision and non touch-screen models: V120, V230,V260)

Turns ON for one scan when the entered value is within the Min/Max limits set in the variable's parameters.

      • The current Display is either re-called or changed,

or

      • At the beginning of the next program cycle.

SB 251

Keypad entry exceeds limits
(Relevant for Standard Vision and non touch-screen models: V120, V230,V260)

Is ON when the entered value is within the Min/Max limits.

 Note ♦ When this SB is ON, the blinking cursor remains on the active variable even after the user presses Enter..

      • The current Display is either re-called or changed,

or

      • At the beginning of the next program cycle.

These SBs relate only to the EX-RC1 I/O expansion adapter.

#

Description

Turns ON when:

Turns OFF when:

SB 252

EX-RC1, Control Bus COMM LED

Controlled by user. SB 252 controls the green LED Bus COMM on the EX-RC1

 By user

SB 253

EX-RC1 - I/Os COM Error

Turns ON at communication failure between EX-RC1 – I/Os

When communication is established between  EX-RC1 – I/Os

SB 254

EX-RC1: Reset all outputs

Turn SB ON to reset all outputs. Controlled by user.

By user

#

Description

Turns ON when:

Turns OFF when:

Reset by:

SB 279

Send SMS messages in ASCII format

User Program

Should be turned ON at power-up, before Com Init.

User Program

User Program

#

Description

Turns ON when:

Turns OFF when:

Reset by:

SB 280

Force Message Display on Cell Phone

User Program

Should be turned ON at power-up, before Com Init.

User Program

User Program

#

Description

Turns ON when:

Turns OFF when:

Reset by:

SB 300

Reset PLC

Note that SB24 performs Reset + Init.

By program or Remote Access

Reset is run

OS

#

Description

Turns ON when:

Turns OFF when:

Reset by:

SB 303

Backup Security in Memory (values stored for SB 314 Block PC access to PLC, SI[253] Info Password value, SI [50] Info Mode press time)

By program or Remote Access

Reset is run

OS

#

Description

Turns ON when:

Turns OFF when:

Reset by:

SB 310

Buzzer
Turn this ON to sound a buzzer Buzzer included only in Touch-screen only models

By user

By user

User

SB 311

Buzzer - Screen Touch
Turn this ON to cause a keypad touch (both HMI keypad and Virtual keypad) to sound a buzzer in relevant models

By user,

ON by default in V290/280

By user

User

#

Description

Turns ON when:

Turns OFF when:

Reset by:

SB 314

Blocks PC access to PLC (VisiLogic, RA, etc. )

By user

By user

(Default)

User

SB 324

SD: Open File (Read to SD)
(Status messages in SI 67)

When Ladder function SD File: Open successfully activates a file for Read

When Ladder function SD File: Close finishes closing an open file and SB 327 (EOF) turns ON

OS. At Power-up and at SD File: Close

SB 325

SD File: Read Chunk in Progress (a Chunk is 512 bytes long)

When the Ladder function SD: Get Next File Chunk is reading a chunk into a vector

When the Ladder function SD: Get Next File Chunk has finished reading the chunk

OS. At Power-up

SB 326

SD Read File: End Of File (EOF, entire file has been read)

When the When the Ladder function SD: Get Next File Chunk reads the final Chunk

When the last chunk has been read, and when Ladder function SD File: Close start

OS. At Power-up and at SD File: Close

SB 327

SD: Open File (Write to SD)
(Status messages in SI 67)

When Ladder function SD File: Open successfully activates a file for Write on a SD card

SB 328

SD File: Write Chunk in Progress (a Chunk is 512 bytes long)

When the Ladder function SD: Get Next File Chunk is writing a chunk into a vector

SB329

SD Write File: End Of File (EOF, entire file has been read)

When the When the Ladder function SD: Get Next File Chunk writes the final Chunk

Each COM port is linked to an SB that monitors communication signal breaks. Note

#

Description

Turns ON when:

Turns OFF when:

Reset by:

SB 330

Break from External Device, COM Port 1

PLC receives break from external device

PLC has finished processing tasks related to break.

If no messages are received after the break, the PLC resets the SB after 5 seconds.

Each message received causes the PLC to wait for 40 seconds before resetting the SB.

OS

SB 331

Break from External Device, COM Port 1

SB 332

Break from External Device, COM Port 1

Each COM port is linked to an SB indicating GPRS communication status. These can be used as a condition to sending new messages.

#

Description

Turns ON when:

Turns OFF when:

Reset by:

SB 334

GPRS 'Active': COM Port 1

Port is transmitting or receiving GPRS signals

Port is free

OS

SB 335

GPRS 'Active': COM Port 2

SB 336

GPRS 'Active': COM Port 3

#

Description

Turns ON when:

Turns OFF when:

Reset by:

SB 340

Log to SD in Progress

Row is being copied from DT to SD Card

When copy is complete

OS

SB 341

Copy Data Table  from PLC to SD in Progress

Entire Data Table is being copied from DT to SD Card

When the Write process is complete

OS

SB 342

Copy Data Table  from SD to PLC in Progress

Entire Data Table is being copied from  SD Card to DT

When the Write process is complete

SB 340

Log to SD in Progress

Row is being copied from DT to SD Card

When copy is complete

OS

SB 341

Write Data Table from PLC to SD in Progress

Entire Data Table is being copied from DT to SD Card

When the Write process is complete

OS

SB 342

Read Data Table from SD to PLC in Progress

Entire Data Table is being copied from  SD Card to DT

When the Write process is complete

OS

SB 343

File Report in Progress

While Report process is in progress

When the Report is complete

OS

SB 344

Write delimited line to SD in Progress

While line is being written

When the Write process is complete

OS

SB 345

email: Send in Progress

Use to avoid communication conflicts and ensure that the e-mail function is free before sending an e-mail

Turns ON when the e-mail function is activated. Turns OFF when the message has been sent to the server.

OS

SB 346

SD Data Block 0 Busy

When a Write or Read utility is being run on a Data Block

When no utility is running

OS

SB 347

SD Data Block 1 Busy

SB 348

SD Data Block 2 Busy

SB 349

SD Data Block 3 Busy

#

Description

Turns ON when:

Turns OFF when:

Reset by:

SB 352

SD: Enable writing Alarm History to SD

Turned ON by user.

Causes the PLC to write entire Alarm History to the SD Card

Off by default. PLC stores Alarm History to memory.

At Power-up, or by user

SB 358

SD: Delete File in Progress

ON when function is busy

OFF when function is not busy

OS

SB 359

SD: File Info function in Progress

ON when function is busy

OFF when function is not busy

OS

SB 366

SD Clone in Progress
Note that the process can take from several seconds to several minutes.

Turns ON when a Clone file is being created OR installed

Turns OFF :

 • When Cloning process is complete

 • Power up

 • SB 217 SD Card Present turns ON

OS

#

Description

Turns ON when:

Turns OFF when:

Reset by:

SB 500

User RAM overlap warning

When the application requests more memory than the PLC currently has free:

• Function Blocks memory requirements may have exceeded free memory.

• Data Table requirements exceed free memory.

• During DT Write: If the value of the pointer to DT is greater than the number of DT lines

Requirements fall with memory capacity

• PLC initialization

• When a password is assigned to a VisiLogic project

#

Description

Turns ON when:

Turns OFF when:

Reset by:

SB 399

Ladder utility failure

A Ladder utility fails to function. When SB399 is ON, the number of the failed utility is found in SI 26

At Power-up

User Program

#

Description

Turns ON when:

Turns OFF when:

Reset by:

SB 501

Retain Inputs Forced Value after power failure

Set SB 501at power-up to retain the state of inputs that are forced to 0 or 1 when the power is turned off.

Reset SB 501at power-up to initialize forced  inputs

By User

By User

User, or when PLC is initialized

#

Description

Value

Comments

SI 0

Scan Time, Resolution: Units of 1 mSec

Updated by the controller at the end of every scan.

A scan is a complete execution of the controller's entire program: reading inputs, executing the Ladder program, updating the outputs, running the HMI program,and processing communications.

Scan time depends on the size and complexity of the application. Check the topic Program Sequencing: Modules, Subroutines, Labels & Jumps.

SI 6

Current key pressed

SI 7

LCD Contrast Control

0=Minimal Contrast

50=Medium Contrast

100=Maximal Contrast

Relevant for V120, V130, V280, V290.

LCD contrast is set for V230, V260 via potentiometer.

SI 8

Unit ID (Network)

The ID # 1 is assigned by default.

To learn how to use this operand, check the topic Assigning a Unit ID number

SI 9

LCD Backlight intensity

0 - 0ff

1 - On (low intensity) (V230 only)

2 - On (max. intensity) - Default

Note that this is relevant for CSTN displays only.

SI 14

Current controller temperature (not supported by V120/130/350)

• Includes decimal point. For example, if the value is 245, the actual value is 24.5.

• The value in SI14 is only updated when SB 14 is turned ON by the user.

#

Description

Value

Comments

26

Ladder Utility Failure Indication

Check table below

When SB 399 is ON, and any Ladder utility fails, SI 26 contains the utility number. Any time a utility fails, SI 26 is overwritten.

Note that resetting SB 399 initializes SI 26.

Strings: to NUM

145

Strings: remove

146

Strings: insert

147

Strings: left

148

Strings: right

149

Strings: middle

150

Strings: find_in_str

151

COM: Set PLC  Network ID

152

Strings: Timer to ASCII

153

HMI: Refresh HMI Display

154

Data Tables: Read/Write Column

155

Reserved

156

SD: Write DT to SD .udt

158

SD: Log DT row to SD

159

Email

160

Alarms: Clear History Buffer

161

COM: Send TCP RAW

162

COM: Scan TCP RAW

163

SD: Set SD Password

164

String: Replace STR A with STR B

165

SD: Save Trend to SD

166

SD: Stop Trend to SD

167

SD: Read from .udt SD to DT

168

Immediate: Frequency Measurement based on HSC

169

Reserved

170

Immediate: Stop Frequency Measurer

171

Immediate: Reset HSC

172

COM: CANopen: Map register bytes

173

SD: Read SD.udt to Data Table

174

CAN J1939: Config

175

CAN J1939: Activate cyclic send

177

CAN J1939: Send pgn

178

Data Tables: Read row

179

Data Tables: Write row

180

COM: TCP/IP: Ping

181

SD: Read SD Block (udb) to Operand Vector

182

SD: Write from Operand Vector to SD Block (udb)

183

SD: Create Block

184

SD: File Read: Open

185

S SD: File Read: Next Chunk

186

SD: File Read: Close

187

CAN J1939: Request PGN Data

188

COM: Df1 Scan

189

COM: SNMP Trap

190

SD: Create Delimited Line

191

SD Write: open file

192

SD Write: read file

193

SD Write: close file

194

SD: Write Delimited Line

195

SD Folder Report: Number of Files

196

SD File: Delete file

197

SD: Write DT to SD .udt

198

SD: Log DT row to SD

199

SD Files: File Info

200

SD Data Tables: Search .udt for key

201

COM: Telegram parser

202

COM: CANLayer2 ScanEx

203

COM: Set SNMP community name

204

Backup security operands

205

SD: Safely Remove

206

SD: Clone

207

COM: DNS Resolver

208

Data Tables: Delete Rows

209

SD: Rename SD File

210

#

Description

Value

Comments

SI 30

Current second

0-59

According to RTC

SI 31

Current time

24 hour clock:

14:59 = 1459

SI 32

Current date

12/07 = 12th of July

SI 33

Current year

2007=2007

SI 34

Current day of week

1-7

SI 35

Current hour

0-23

SI 36

Current minute

0-59

SI 37

Current day of month

30 = 30th day of month

SI 36

Current Month

1-12, where 1 corresponds to January.

#

Description

Value

Comments

SI 40

Touchscreen is being touched- X coordinates

If the screen is touched, SI 40 shows the current location on the X axis.

When the screen is not touched, SI 40 = -1

SI 41

Touchscreen is being touched-Y coordinates

If the screen is touched, SI 41 shows the current location on the Y axis.

When the screen is not touched, SI 41 = -1

#

Description

Value

Comments

SI 42

Active Keypad Entry variable

Number of currently active variable

You can write a number to activate a different variable

#

Description

Value

Comments

SI 45

Numeric Key Entry Out of Limit - Counter of Attempts

Counts the number of failed attempts to enter a value, such as a password

Enhanced Vision only

If a Legal Entry bit is defined, SB 94 does not turn ON if the entered value is out of range. The keypad stays on screen until a legal value is entered.

You can use SI 45 in conjunction with a Compare function to exit the variable.

#

Description

Value

Comments

SI 46

Refresh HMI Buttons, Frame, Text

Units 10 msec, redraws these items in current display to reflect changes

#

Description

Value

Comments

SI 49

Select Touch Keyboard Type

0, 1, 257

See the topic Vision Controller Divisions, Special Issues, Virtual Keypads: Enhanced Touchscreen Models

#

Description

Value

Comments

SI 50

INFO delay time

Default by O/S (every power up) = 4 seconds

• Units: seconds

• Legal values: 0, 3 to 20

• If you force or store '0' into equal Zero INFO is disabled

• For V290 Touching the <i\> key on the touch screen starts Info Mode Touching a legal Ladder application variable clears the INFO time

SI 51

Info Mode, Serial COM Monitor: # of messages not displayed

Number of messages not displayed. Initialized every time the Monitor is entered

When entering the monitor, the display must synchronize with the actual messages in real time. This SI contains the number of messages that are not displayed before synchronization is complete.

#

Description

Value

Comments

SI 58

email: Limit File Attachment Size

1=1024 bytes

• Power-up default is 1

• Maximum per attachment = 10 (10 MB)

Note that the file size must not be changed while the Send is in Progress.

#

Description

Value

Comments

SI 59

Send e-mail: Increase Timeout

resolution=10 ms

In some applications, such as those relying on slower cellular routers, the Send e-mail process may require added time. Use this to add that time.

#

Description

Value

Comments

SI 63

Maximum number of Trend files that can be saved (read-only)

0-64

The maximum amount of Trend files (*.udt files) in a single folder is 64. The value in SI 63 shows the number of remaining *.utr files; if 5 *.utrt files exist, SI 64 = 59

• Initialized at Power-up

• Updated when:SB 217 is ON and SB 341 turns ON

SI 64

Maximum number of DT files that can be saved (read-only)

0-64

The maximum amount of Trend files (*.udt files) in a single folder is 64. The value in SI 64 shows the number of remaining *.udt files; if 5 *udt files exist, SI 64 = 59

• Initialized at Power-up

• Updated when:SB 217 is ON and SB 341 turns ON

#

Description

Value

Comments

SI 66

SD Card Status Messages

This SI is a bitmap; a bit turns ON to indicate status.

• All bits OFF – No errors

• Bit 1 – Read: End Of File indication

• Bit 2 – Can't open file

• Bit 3– Error while writing to a file

• Bit 4 – Error while reading from a file

• Bit 5 – Failed to close a file

• Bit 6 – SD is full

• Bit 7 – Path not found

• Bit 14 - Turns ON when SD is inserted into slot and PLC runs checks, turns OFF when SB 217 turns ON

• Initialized at Power-up.

• While the application is running, the user application must reset the bits.

#

Description

Value

Comments

SI 67

SD Card, Read Files: Status

Value

0= No error

1= No SD card in Slot

2= Vector is not long enough to contain data (may be at upper address limit of that  data type)

3= Path to SD file not found

4=Another file is currently open

5 = File is closed

6 = Busy: previous request in progress

7 = File Open Error

8 = Read Error

9 = File Close error

SI 67 reports status for the following SD File utilities:

• Read SD File: Open

• Read Next File Chunk

• Read SD File: Close

SI 68

SD Card, Write Files: Status

Value

0 = No error

1 = No SD card in Slot

2 = Vector is not long enough to contain data (may be at upper address limit of that  data type)

3 = Path to SD file not found

4 = Another file is currently open

5 = File is closed

6 = File Open error

7 = Write Error

14 = File Close error

SI 68 reports status for the following SD File utilities:

• Write SD File: Open

• Write Next File Chunk

• Write SD File: Close

#

Description

Value

Comments

SI 69

SD Card: File Open Time (may signal file fragmentation)

Time required to open SD files, in units of 10mSec.

Each time a file is opened, the OS updates this value.

A typical first write (open + write) =approx. 500mSec, typical first read (open + read)= approx. 60mSec

Over time, this may increase due to file fragmentation.

If the time becomes to great, the card should be reformatted

Reset at Power-up and when SD card is removed.

#

Description

Value

Comments

SI 160

SD Trend 1 status

This SI is a bitmap; a bit turns ON to indicate status when the function Start Saving Trend to SD runs.

• All bits OFF – No errors

• Bit 4 – Start Saving Trend is in progress for another Trend

• Bit 7 – This Trend does not exist (may result when an MI is used to provide the Trend number, and the value points to a non-existent Trend)

• Bit 8 – Start Saving Trend is in progress for this Trend

• Bit 9 – Start Saving Trend failed

SI 161

SD Trend 2 status

SI 162

SD Trend 3 status

SI 163

SD Trend 4 status

SI 164

SD Trend 5 status

SI 165

SD Trend 6 status

SI 166

SD Trend 7 status

SI 167

SD Trend 8 status

#

Description

Value

Comments

SI 330

SD: Write DT from PLC to SD - Total Amount of Data to be Copied (blocks of 512 bytes)

When the application runs the function Copy Data Table to SD, SI 330 shows the total number of  blocks of data to be copied from the PLC.

Initialized at Power-up

SI 331

SD: Write DT from PLC to SD - Remaining Amount (blocks not yet copied)

Shows how many blocks of data remain to be copied.

The value increases by 1 each time a block is copied.

Initialized:

• When the PLC begins to copy a new block of data to the SD card

• At Power-up.

SI 332

SD: Read DT SD to PLC - Total Amount of Data to be Copied (blocks of 512 bytes)

When the application runs the function Copy Data Table to PLC, SI 332 shows the total number of blocks of data to be copied from the SD.

Initialized at Power-up

SI 333

SD: Read DT from SD to PLC - Remaining Amount (blocks not yet copied)

Shows how many blocks of data remain to be copied.

The value increases by 1 each time a block is copied.

Initialized:

• When the PLC begins to copy a new block of data from the SD card

• At Power-up.

#

Description

Value

Comments

SI 72

FLASH Storage Bitmap (V570, 290-C)

A bit is on when data is present

Bit 0 = Data backup from RAM to FLASH

Bit 1 = Upload data (.vlp in PLC can be uploaded)

Bit 2-7 = Internal

Bits 8-15 =  String storage

The SI is updated by the OS after every download.

FLASH informations is divided into sections. The status the bits shows if data is stored in these sections.

Relevant to V570, V290-C.

#

Description

Value

Comments

SI 74

Alarms Utility, General Status

A bit is on when data is present

Initialized at power-up

Bit 0 = Alarm Version in OS does not match VisiLogic version

Bit 1 = No Alarms defined

Bit 2 = Internal error

Bit 8 =  History buffer full

#

Description

Value

Comments

SI 75

Operand assignment error

0 = no error

Any other value = Error

Number of functions assigned operands that are of illegal address or type.

Relevant to V570, V290-C.

#

Description

Value

Comments

SI 76

Number of Alarms currently in History Buffer

Shows the number of Alarms in the PLC memory buffer

Each COM Port is linked to 2 SIs; their values and messages are indicated below.

SI 80

Modem Status: COM 1

SI 81

Error Code: COM 1

SI 82

Modem Status: COM 2

SI 83

Error Code: COM 2

SI 84

Modem Status: COM 3

SI 85

Error Code: COM 3

SI

Description

Value

100

Maximum Time Delay between characters (units 2.5ms) MODBUS +  Modem

When MODBUS (Serial) is configured, the MODBUS function checks SI 100. If SI 100 = 1, a time interval of up to 2.5 msecs is permitted between characters, if SI 100 contains 2, the permitted interval is 5 msecs ( n x 2.5 =interval).

Note that:
- The power-up value is 1,
-  the application must update SI 100 before the MODBUS configuration is activated.

Note ♦

The Vision700 controller series comprises a built in Ethernet port, and many of the Ethernet system operands listed below do not apply to the V700.

Please check the topic Vision700 - Using Ethernet for complete information.

#

Description

Value

Comments

SI 101

TCP/IP retries base time out

• Legal values are 2 to 50, units of 100 msec (1 stands for 100 msec etc.)

• Default value is 200 msec.

•  Same value is for ALL 4 sockets

•  Requires CARD INIT

• Illegal value request will be rejected (no change)

SI 102

Retries count

• Legal values are from 1 to 50

• Default value is 6

• Illegal value request will be rejected (no change)

SI 103

 TCP/IP Connection Keep Alive (Socket 0)

Units of 100 msec

Note- When value is ‘0’, the function is disabled

Enables the PLC to disconnect if there is no communication from the connected device.

• When TCP/IP connection is established (SI 145-148 = 6) check data transport (SDW 14 – 21).

•  If no data transport occurred during the defined time – perform ‘Socket Init’.

• Data Transport counter is SDW 38

SI 104

TCP/IP Connection Keep Alive (Socket 1)

SI 105

TCP/IP Connection Keep Alive (Socket 2)

SI 106

TCP/IP Connection Keep Alive (Socket 3)

SI 107

TCP/IP Keep Client (Master) Connection  (Socket 0)

Units of 100 msec

Note- When value is ‘0’, the function is disabled

Enables the PLC to reconnect the connect when there is no communication from the connected device for the defined time.

• Note that the value per socket should be higher the regular “keep alive” (SI 103 – 106)

• Counter of the operation in SDW 45

SI 108

TCP/IP Keep  Client (Master)Connection  (Socket 1)

SI 109

TCP/IP Keep  Client (Master)Connection  (Socket 2)

SI 110

TCP/IP Keep  Client (Master)Connection  (Socket 3)

SI 140

Ethernet Send has failed, per socket ( bitmap)

Bit is ON when Send is not successful

Bitmap:

| UDP S3 | UDP S2 | UDP S1 | UDP S0 | TCP S3 | TCP S2 | TCP S1 | TCP S0 |

SI 141

Ethernet Socket 0: Protocol Type

• 0=PC application (default)

• 1=MODBUS

(Read-only)

Sockets are set to Protocol Type 0 by default. Activating MODBUS Configuration changes the  Protocol Type to 1.

SI 142

Ethernet Socket 1: Protocol Type

SI 143

Ethernet Socket 2: Protocol Type

SI 144

Ethernet Socket 3: Protocol Type

Parameter

Function

SI Value

Message

S1 145

Socket 0: Status

 0

 Initialized to UDP, status: Closed

SI 146

Socket 1: Status

 2

 Initialized to TCP, status: Listen

SI 147

Socket 2: Status

 14

 Initialized to UDP, status: Ready

SI 148

Socket 3: Status

 15

 Initialized to UDP, status: Engaged in Transmit/Receive

#

Description

Value

Comments

SI 184

Installed Com Port

Indicates which port is installed: 0-none, 1-serial, 2-eth,4-profibus

SI

Description

Value

185

GSM Signal Quality (V120/230/260/280/290-BW)

• The value is written during COM Init of the GSM modem. The value is updated whenever the user uses the GSM Signal Quality FB.

• A value of -1(FFFF) signifies a modem error. This may be due to a weak signal; try repositioning the antenna. If this has no effect, check the modem.

188

GSM Signal Quality COM2 (V570, 290-C)

191

GSM Signal Quality COM3 (V570, 290-C)

#

Description

Value

Comments

SI 205

Hardware Configurations

Select the active configuration storing a value in SI 205. The application will run according to the selected Config without error.

When you store the value, the controller will reboot and will use the selected hardware configuration.
Note: You can only store the index numbers that are actually associated with a configuration. If, for example you have defined only 4 configurations, and you store the number 7, the application will not run.

#

Description

Value

Comments

SI 244

V1040, X Coordinates, Num Keypad/Alarm screen

Enter the X value to alter the location of these elements on the screen.

Values remain until changed by user

SI 445

V1040, Y Coordinates, Num Keypad/Alarm screen

Enter the Y value to alter the location of these elements on the screen.

Values remain until changed by user

SI 246

 (V1210/V1040 only) Improve Display of Complex HMI Element. 1- 30

If an HMI element shows many lines of text or contains other complex data, parts of the element might not be drawn on the HMI screen. To resolve this issue, you can start by entering 2 into SI 246 and then gradually increasing the value until the issue resolves. The maximum legal limit is 30.

SI 249

Last Active Keypad Entry Variable

Contains the ID number of the last active variable.

SI 250

Currently active keypad entry, read/write

Currently active keypad entry, read/write.

When either SB 250' Keypad Entry Within Limits' or SB251 'Keypad Entry Exceeds Limits' turn ON,  the index number of the variable is stored here. As you navigate between variables, as for example with the right-left arrow keys, SI 250 will show only the numbers of variables that have not been completed.

Note ♦ A value of -1 indicates that, in this particular display, the user has pressed Enter for all the Keypad Entry variables in the Display.

SI 251

Previous HMI Display Number

SI 252

Current HMI Display Number

To see a list of Displays in a project together with their Display numbers, select HMI Information from the View menu.

SI 253

Password: Info Mode

Note that at every power-up, the default password to Info Mode, 1111, is restored. To maintain a different password after power-up, use SB 2-Power-up as a condition to store the desired password value into SI 253.

The password may also be modified by accessing the controller via VisiLogic, then running On-line Test mode and changing the value. This value will be erased at power-up.

SI 274

COM1, Received Message Counter

Counts received messages, increments after message is validated.

Initialized by OS at power-up

SI 275

COM2, Received Message Counter

SI276

COM3, Received Message Counter

Note ♦

These SIs record the number of packets received or transmitted per socket. They apply to all Ethernet communications.

#

Description

Value

Comments

SI 301 - 308

Ethernet: Rx Packet Length

• Initialized at power-up

• Number of received packets is updated each time a message is received by the socket

 The number of packets received per socket is stored in these integers as follows:

• Socket 1: SI 301

• Socket 2: SI 302

• Socket 3: SI 303

• Socket 4: SI 304

in controllers offering more than 4 sockets, such as V700

• Socket 5: SI 305

• Socket 6: SI 306

• Socket 7: SI 307

• Socket 8: SI 308

SI 311 - 308

Ethernet: Tx Packet Length

• Initialized at power-up

• Number of transmitted packets is updated each time a message is received by the socket

 The number of packets transmitted per socket is stored in these integers as follows:

• Socket 1: SI 311

• Socket 2: SI 312

• Socket 3: SI 313

• Socket 4: SI 314