WAGO 750-341 Manual page 155

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6.5.2 Diagnostic Functions
The following registers can be read to determine errors in the node:
Register address 0x1020 (MODBUS Address 404129)
Designation
Access
Description
Register address 0x1021 (MODBUS Address 404130)
Designation
Access
Description
WAGO-I/O-SYSTEM 750
ETHERNET TCP/IP
To stop the watchdog after it is started, write the value 0x0AA55 or
0X55AA into it the Simply Stop Watchdog register (0x1008).
Set the watchdog for a timeout of 10 minutes. Function code 3 (Read
Multiple Registers) will be use to reset the watchdog time.
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).
LedErrCode
read
Declaration of the Error code (see section 3.1.8.4 for error code definitons)
LedErrArg
read
Declaration of the Error argument (see section 3.1.8.4 for error code
definitons)
) in the Coding Mask register (0x1001)
MODBUS Functions
Internal Variables
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