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MVI69E-MBS ♦ CompactLogix™ Platform
Reference
Modbus Serial Enhanced Communication Module
User Manual
ProSoft Technology, Inc.
Page 147 of 159
8.4.15 Pass-through Formatted Block for Function 5 (9958)
Block 9958: Pass-Through Formatted Block for Function 5
Block 9958: Request from Module to Processor
Offset
Description
0
Read Block ID: 9958
1
Write Block ID: 9958
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 9958: Response from Processor to Module
Offset
Description
0
Write Block ID: 9958
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.