TCP Raw Send/Receive

These functions are located on the COM>TCP/IP>TCP menu. Use them to send a vector of raw data to a remote Vision, broadcast the data to the entire network, or receive a stream of data and write it to a vector of registers.  

The number of bytes a message can comprise varies according to Vision model:

 

TCP Raw is a master/slave protocol. In addition to other TCP/IP elements, the master application contains a TCP Connect function.

Send

  1. Configure Ethernet in your application by building a net that comprises the following elements:

  1. Com>TCP/IP> Card Init function.

  2. Com>TCP/IP>Socket Init function, set to TCP_RAW.

 

 

  1. Include a TCP\IP: TCP Connect function.

  2. Configure a TCP RAW Send function to determine the data to send to a specific PLC.
     

 

 

Note ♦

Use a Send condition; do not place it directly on the left Ladder rail.

Parameter Name

Purpose

Sending Socket

The PLC sends the data through this socket. Select a socket that is initialized to UPD_RAW

Source Start Address

Start address of the vector containing the data

Vector Length

Determines the vector length

Status

Shows the status of the message that is sent

Value      Message

1            Data Sent Successfully

-1             Illegal Socket (not 0-3)

-2             Data length is longer than Ethernet buffer

-3             Illegal operand

-4             Socket not initialized

-5             Protocol not TCP

-6            Send failed

Scan

The Scan function enables a PLC to receive data from a specified remote PLC and write it to a vector of registers.

  1. Configure the application in the PLC that receives the data by building a net that comprises a Card Init function and a Socket Init function, set to UDP_RAW.

  2. Configure a UDP RAW Scan function to receive the data.

Note ♦

In most applications, Scan should be active all the time. To accomplish this, place the Scan function in the main routine, directly on the left Ladder rail.

 

 

Parameter Name

Purpose

Socket

This is the socket that receives the data. This socket must be initialized  to TCP_RAW

Destination Start Address

Start address of the vector to which the received  data is written

Vector Length

The number of bytes received. Is reset by OS when the element activates.

Data Arrived

Use this to monitor message status

Status

 

Shows the status of the message that is received:

Value      Message

o              Data Received Successfully

-1            Card not initialized, or link fail

-2             Illegal Socket

-3             Socket not initialized

-4             Protocol not TCP

-5             Illegal operand

-6            Data length is longer than Ethernet buffer d