ProSoft MVI69E-MBS - Pass-Through Formatted Block for Function 23 (9961)

MVI69E-MBS ♦ CompactLogix Platform Reference
Modbus Serial Enhanced Communication Module User Manual
ProSoft Technology, Inc. Page 141 of 154
June 28, 2017
7.4.17 Pass-through Formatted Block for Function 23 (9961)
Block 9961: Pass-Through Formatted Block for Function 23
Block 9961: Request from Module to Processor
Offset
Description
0
Read Block ID: 9961
1
Write Block ID: 9961
2
Number of word registers in Modbus data set
3
Starting address for Modbus data set
4 to (n+1)
Data (Length in words = n - 2)
Where n = 60, 120, or 240 depending on the Block Transfer Size parameter.
The ladder logic is responsible for parsing and copying the received message
and performing the proper control operation as expected by the Master device.
The processor must then respond to the pass-through control block with an
output image write block with the following format.
Block 9961: Response from Processor to Module
Offset
Description
0
Write Block ID: 9961
1 to n
Spare (Length in words = n - 2)
This informs the module that the command has been processed and can be
cleared from the Pass-Through queue.