Pass-Through Formatted Block For Function 23 (9961) - ProSoft Technology CompactLogix MVI69E-MBS User Manual

MVI69E-MBS ♦ CompactLogix™ Platform
Modbus Serial Enhanced Communication Module

8.4.17 Pass-through Formatted Block for Function 23 (9961)

Block 9961: Pass-Through Formatted Block for Function 23
Block 9961: Request from Module to Processor
Description
Offset
Read Block ID: 9961
0
Write Block ID: 9961
1
Number of word registers in Modbus data set
2
Starting address for Modbus data set
3
Data (Length in words = n - 2)
4 to (n+1)
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
Description
Offset
Write Block ID: 9961
0
Spare (Length in words = n - 2)
1 to n
This informs the module that the command has been processed and can be cleared
from the Pass-Through queue.
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Reference
User Manual
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