Read Or Write Data To Or From A Block Transfer Module Via A Message Instruction; Read Data From A Block Transfer Module - Rockwell Automation Allen-Bradley ControlNet 1734-ACNR User Manual

D-4 Control 1771 I/O Over ControlNet
Read or Write Data To or
From a Block Transfer
Module Via a Message
Instruction
Reads 16-bit integers (INTs) from the module and stores them in int_buffer_read. (Only include the msg_write.EN tag and associated instruction if
you also send a block transfer write message to the same module.)
msg_read.EN
/
Publication CNET-UM001C-EN-P - November 2005
Use this procedure to transfer data to or from a module that requires block
transfers. Use an INT buffer in the message and move the data into or out of
the buffer as needed because DINTs can increase the program scan.

Read Data From a Block Transfer Module

1. To read data from a block transfer module, enter the following rung of
ladder logic:
msg_write.EN
/
This table describes the tags used in this message
Table D.1 Tag Description
Tag Name:
msg_read
Type - Block Transfer Read
Message Control
Description: Data Type:
block transfer MESSAGE
read message
MSG
msg_read ...
Scope:
name_of_controller
(controller)
EN
DN
ER