Safety Watchdog Time Value is 0 ms (F_WD_Time)

What does 11 mean?

The PROFIsafe watchdog time parameter (F_WD_Time) in the safety PLC configuration is set to 0 milliseconds. A zero value is invalid and effectively disables the watchdog, which is critical for monitoring the timeliness of safety communication. Without a functioning watchdog, communication failures or system freezes might go undetected, posing a significant safety risk.

• The F_WD_Time parameter was explicitly set to 0ms during configuration, which is an invalid value for PROFIsafe operation.
• Default setting of 0ms was not updated to a valid, non-zero value during initial safety PLC project setup.
• Error in the PLC programming software or GSDML file resulting in an incorrect default or range for F_WD_Time.
• Project corruption causing the F_WD_Time value to revert to 0ms.

Click steps to track your progress.

1. 1

   Navigate to the PROFIsafe parameters of the safety PLC or associated safety I/O device in the PLC programming software.

2. 2

   Set the F_WD_Time parameter to a valid non-zero value (e.g., 50ms, 100ms, or as recommended by the device manufacturer).

3. 3

   Ensure the F_WD_Time is consistent between the safety PLC and all connected PROFIsafe devices.

4. 4

   Recompile the safety PLC project and download the updated configuration to the safety PLC.

5. 5

   Monitor the safety system for stable operation after implementing the change.