Loadcell Hardware Configuration

Parameter

Type

Function

In use

Select 'In Use' to enable the loadcell for the application.

Note ♦ A loadcell marked 'in use' can be suspended according to application conditions via the Advanced Calibration function Enable/Disable loadcell.  This may be done to shorten the application's calibration time.

Resolution

MI

Selecting High enables you to link the input value to one or 2 MIs, Normal to an MI. Note that you can process 2 MIs values as 'long' integers as explained in the Help topic Special Function 'Long' Integers.

LC Input Value(s)

MI

When the application runs, these registers contain the weight value input to the controller from the I/O LCx.

The LC values are automatically linked to successive MIs according to the Number of Input Values and Resolution you select. Take care not to overwrite these MIs during the application.

Selections:

• One value, Resolution = Normal: the LC value is linked to 1 MI.

• One value, Resolution = High : the LC value is linked to 2 successive MIs.

• Two values , Resolution = Normal: the LC value is linked to 2 successive MIs.

• Two values, Resolution = High: the LC value is linked to 4 successive MIs.

The default representation mode for the first value is Net Weight, and Gross Weight for the second.

Excitation

AC is the default, recommended Excitation method. You may select the DC option if your application requires.

Hardware
Status Messages

MI

Provides a bitmap showing the status of the module.

Bit#

Description

Turns ON when:

Turns OFF when:

0

Scale motion
Only relevant if Motion Band is included in application and activated

Scale is in motion

• At Power-up

• When Scale is steady

1

Input Value Range
Linked to I/O module's Out of Range LED indicator

Input value is out of range
Possible causes:

• 1 or more signal wires are disconnected

• A/D input voltage is out of range

Input value is in range

2

Input Value Validity

Input Value is invalid
Possible causes:

• Channel is temporarily disabled, via the Disable all other Loadcells command

• Bit is ON at Power-up until the first input value is received from the loadcell

Input Value is valid

3

Loadcell Calibration Status

When less than 2 points are calibrated

At least 2 points are calibrated

4

Input Power Supply Status
Linked to I/O module's Out of Range LED indicators

No Power

Power Supply OK

• When the input power is not supplied, the indicators blinks rapidly

Note ♦  Bits 6 & 7 are linked to Outputs 0 & 1, located on the I/O module. Bit 6 is related to Output 0, Bit 7 to Output 1.

Bits 6 & 7 can be used to monitor the setpoint output's status from within the Ladder application.

The I/O module itself controls the setpoint function of the outputs. The module turns the outputs ON and OFF when the current loadcell input value reaches setpoint. Since the function is based in the firmware of the expansion module, when the output's status changes as a result of reaching/departing from setpoint, the status change is not registered by the Ladder application.

Examples

• When setpoint output 1 is assigned to load cell channel 0, Bit 7 of load cell 0 status will indicate the state of output 1.

• When setpoint output 0 is assigned to load cell channel 2, Bit 6 of load cell 2 status will indicate the state of output 0.

6

Setpoint Status, Output 0

Output 0 is ON

Output 0 is OFF

7

Setpoint Status, Output 1

Output 1 is ON

Output 1 OFF

SB91

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..