WAGO 750 Series Manual page 123

Examples:
Set the watchdog for a timeout of 1 second. Function code 5 (Force Single
Coil) will be use to reset the watchdog time.
Set the watchdog for a timeout of 10 minutes. Function code 3 (Read Multiple
Registers) will be use to reset the watchdog time.
WAGO-I/O-SYSTEM 750
ETHERNET TCP/IP
1. Write 0x000A (1000ms /100 ms) in the Watchdog Timer register
(0x1000).
(5-1)
2. Write 0x0010 (2
3. Modify the value of the Watchdog-Trigger register (0x0003) to start the
watchdog.
4. At this point, the fieldbus master must continuously use function code 5
(Force Single Coil) within the specified time to reset the watchdog timer.
If time between requests exceeds 1 second, a watchdog timeout error
occurs.
To stop the watchdog after it is started, write the value 0x0AA55 or
0X55AA into it the Simply Stop Watchdog register (0x1008).
1. Write 0x1770 (10*60*1000 ms / 100 ms) in the register for time overrun
(0x1000).
(3-1)
2. Write 0x0004 (2
3. Modify the value of the Watchdog-Trigger register (0x0003) to start the
watchdog.
4. At this point, the fieldbus master must continuously use function code 3
(Force Single Coil) within the specified time to reset the watchdog timer.
If time between requests exceeds 10 minutes, a watchdog timeout error
occurs..
To stop the watchdog after it is started, write the value 0x0AA55 or
0X55AA into it the Simply Stop Watchdog register (0x1008).
) in the Coding Mask register (0x1001)
) in the Coding Mask register (0x1001)
Fieldbus Communication
MODBUS Functions
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