WAGO 750 Series Manual page 122

116 • MODBUS Functions
Internal Variables
Register address 0x100A (MODBUS Address 404107)
Designation
Access
Default
Description
All register data is in word format.
Alternative watchdog
read / write
0x0000
This register provides an alternate way to activate the watchdog timer.
Proceedure: Write a time value in register 0x1000; then write a 0x0001 into
register 0x100A. With the first MODBUS request, the watchdog is started.
The watchdog timer is reset with each Modbus/TCP instruction. If the watch
dog times out, all outputs are set to zero. The outputs will become
operational again, after communications are re-established.
WAGO-I/O-SYSTEM 750
ETHERNET TCP/IP