Technical data

240 • Fieldbus Communication
MODBUS Functions
WAGO-I/O-SYSTEM 750
BACnet/IP Controller
Examples:
4 Channel Digital Input Module = 0x8401
bit 15 1
4
1
3
1
2
1
1
10 9 8 7 6 5 4 3 2 1 0
code 1 0 0 0 0 1 0 0 0 0 0 0 0 0 0 1
hex 8 4 0 1
2 Channel Digital Output Module = 0x8202
bit 1
5
1
4
1
3
12 11 10 9 8 7 6 5 4 3 2 1 0
code 1 0 0 0 0 0 1 0 0 0 0 0 0 0 1 0
hex 8 2 0 2
Register address 0x2031 (MODBUS Address 408242, with a word count of up to 64)
Designation Description of the connected busmodules
Access read modules 65 ... 128
Description Length 1-64 words
These 64 registers identify the 2nd block of I/O modules present (modules
65 to 128). Each module is represented in a word. Because item numbers
cannot be read out of digital modules, a code is displayed for them, as de-
fined below:
Bit position 0 ! Input module
Bit position 1 ! Output module
Bit position 2-7 ! not used
Bit position 8-14 ! module size in bits
Bit position 15 ! Designation digital module
Register address 0x2032 (MODBUS Address 408243, with a word count of up to 64)
Designation Description of the connected I/O modules
Access read modules 129 ... 192
Description Length 1-64 words
These 64 registers identify the 3rd block of I/O modules present (modules
129 to 192). Each module is represented in a word. Because item numbers
cannot be read out of digital modules, a code is displayed for them, as de-
fined below:
Bit position 0 ! Input module
Bit position 1 ! Output module
Bit position 2-7 ! not used
Bit position 8-14 ! module size in bits
Bit position 15 ! Designation digital module