ProSoft Technology MVI69E-MBTCP - Manual (Page 141)

MVI69E-MBTCP ♦ CompactLogix Platform Reference
Modbus TCP/IP Enhanced Communication Module User Manual
ProSoft Technology, Inc. Page 141 of 150
May 20, 2015
Block 9959: Response from Processor to Module
Offset Description
0 Write Block ID 9959
1 to n Spare
7.4.16 Pass-Through Formatted Block for Function 23 (9961)
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 53 Modbus Data
54 to (n-1) Spare
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 client device.
The processor must then respond to the Pass-Through control block with an
output image write block with the following format. This informs the module that
the command has been processed and can be cleared from the Pass-Through
queue.
Block 9961: Response from Processor to Module
Offset Description
0 Write Block ID 9961
1 to n Spare (Length in words = n - 2)
7.4.17 Pass-Through Block for Function 99 (9970)
Block 9970: Request from Module to Processor
Offset Description
0 Read Block ID 9970
1 Write Block ID 9970
2 1
3 0
4 to (n-1) Spare data area
Where n = 60, 120, or 240 depending on the Block Transfer Size parameter.