Hi everyone,
I would like to implement an Exception Task on a WAGO CC100 (751-9402) to handle a watchdog timeout in my application.
This is my first time working with Exception Tasks, so any guidance or best practices would be greatly appreciated.
Application Goal
In the event of a watchdog timeout, I need the controller to immediately place the plant in a safe state by:
- Energizing a trip relay
- De-energizing an undervoltage relay
This is part of the protection system for a solar power plant, and it is critical that these outputs are driven reliably if the main application stops executing.
Questions
- Does the WAGO CC100 require any specific configuration to enable or support Exception Tasks for watchdog handling?
- Is creating a System Event under Task Configuration in CODESYS the correct way to implement this?
- Are there any limitations or recommendations regarding which outputs can be controlled from an Exception Task?
- Has anyone successfully used this approach on the CC100 for fail-safe actions?
- What about digital outputs? If I set it to TRUE it will work?
What I Have Done
In CODESYS, I created a System Event inside Task Configuration and linked it to the watchdog exception event (see attached image).
Is this the correct approach?
Any examples, documentation references, or practical advice would be very helpful.
Thank you.
