ProSoft Technology MVI56E-MNETC - Page 125

MVI56E-MNETC/MNETCXT ♦ ControlLogix Platform Reference
Modbus TCP/IP Client Enhanced Communication Module - Client/Server User Manual
ProSoft Technology, Inc. Page 125 of 172
September 20, 2018
Pass-Through Block 9959 from Module to Processor
Word Offset
Description
Length
0
0
1
1
9959
1
2
Number of word registers in Modbus data set
1
3
Starting word address for Modbus data set
1
4 to 53
Modbus data set
50
54 to 103
Bit mask for the data set. Each bit to be considered with the
data set will have a value of 1 in the mask. Bits to ignore in
the data set will have a value of 0 in the mask.
50
104 to 248
Spare data area
145
249
9959
1
Pass-Through Block 9970 from Module to Processor (Function 99 request)
Word Offset
Description
Length
0
0
1
1
Read block ID: 9970
1
2
1
1
3
0
1
4 to 248
Spare data area
245
249
Write block ID: 9970
1
The ladder logic copies and parses the received message, and controls the
processor as expected by the Client device. The processor responds to the
formatted pass-through blocks with a write block.
Response Blocks 9956, 9957, 9958, 9959, 9960, 9961, or 9970 from Processor to Module
Word Offset
Description
Length
0
9956, 9957, 9958, 9959, 9960, 9961, or 9970
1
1 to 249
Spare data area
247