ProSoft Technology MVI69E-MBS - Manual (Page 145)

MVI69E-MBS ♦ CompactLogix Platform Reference
Communication Module User Manual
ProSoft Technology, Inc. Page 145 of 162
January 6, 2014
Block 9959: Request from Module to Processor
Offset Description
0 Read Block ID: 9959
1 Write Block ID: 9959
2 Length in words
3 Data address
4 to 28 Modbus Data
29 to 53 Bit mask to use with the data set. Each bit to be considered with the data set has
a value of 1 in the mask. Bits to ignore in the data set has a value of 0 in the
mask.
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 Master device.
The processor must then respond to the pass-through control block with a write
block with the following format.
Block 9959: Response from Processor to Module
Offset Description
0 Write Block ID: 9959
1 to (n-1) Spare
This informs the module that the command has been processed and can be
cleared from the pass-through queue.
7.4.17 Pass-through Formatted Block for Function 22
Block 9960: Pass-through Formatted Block for Function 22
Block 9960: Request from Module to Processor
Offset Description
0 Read Block ID: 9960
1 Write Block ID: 9960
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.