Data Exchange Between Modbus/Tcp Master And I/O Modules; Table 36: Allocation Of Digital Inputs And Outputs To Process Data Words In Accordance With The - WAGO -I/O-SYSTEM 750 Manual

96 Function Description
7.3.3 Data Exchange between MODBUS/TCP Master and I/O
Modules
Data exchange between the MODBUS/TCP Master and the I/O modules is
conducted using the MODBUS functions implemented in the controller by means
of bit-by-bit or word-by-word reading and writing routines.
There are 4 different types of process data in the controller:
• Input words
• Output words
• Input bits
• Output bits
Access by word to the digital I/O modules is carried out in accordance with the
following table:

Table 36: Allocation of Digital Inputs and Outputs to Process Data Words in Accordance with the

Intel Format
Digital inputs/
outputs
Process data
word
Byte
Output can be read back in by adding an offset of 200
MODBUS address.
Data > 256 words can be read back by using the cumulative offset!
All output data greater than 256 words and, therefore located in the memory
range 0x6000 to 0x62FC, can be read back by adding an offset of 1000
(0x1000) to the MODBUS address.
Manual
1.5.0
750-882 Media Redundancy ETHERNET Controller
16. 15. 14. 13. 12. 11. 10.
Bit Bit Bit Bit Bit
15 14 13 12 11
High byte D1
WAGO-I/O-SYSTEM 750
9. 8. 7.
Bit Bit Bit Bit Bit Bit
10 9 8 7 6
(0x0200) to the
hex
6. 5. 4. 3. 2. 1.
Bit Bit Bit Bit Bit
5 4 3 2 1
Low byte D0
hex
0