Technical data

MODBUS Functions • 167
Internal Variables
WAGO-I/O-SYSTEM 750
ETHERNET TCP/IP
Register address 0x102A (MODBUS Address 404139, with a word count of 1)
Designation Modbus TCP Connections
Access read
Description Number of TCP connections
Register address 0x1030 (MODBUS Address 404145, with a word count of 1)
Designation Configuration MODBUS/TCP Timeout
Access read / write
Default 0x0000
Description This is the maximum number of milliseconds the buscoupler will allow a
ModbusTCP connection to stay open without receiving a Modbus request.
Upon timeout, idle connection will be closed. Outputs remain in last state.
Default value is 0 (timeout disabled).
Register address 0x1031 (MODBUS Address 404146, with a word count of 3)
Designation Read the MAC-ID of the controller
Access read
Description This register gives the MAC-ID, with a length of 3 words
Register address 0x2030 (MODBUS Address 408241, with a word count of upto 65)
Designation Description of the connected I/O modules
Access Read modules 0 ... 64
Description Length 1-65 words
These 65 registers identify the controller and the first 64 modules present in a
node. Each module is represented in a word. Because item numbers cannot
be read out of digital modules, a code is displayed for them, as defined
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
Examples:
4 Channel Digital Input Module = 0x8401
bit 1514131211109876543210
code 100001000000000 1
hex 8 4 0 1
2 Channel Digital Output Module = 0x8202
bit 1514131211109876543210
code100000100000001 0
hex 8 2 0 2