- Check the module with an error. Check the supervision events via the Web HMI for a faulty hardware module.
- Inspect the merging unit visually.
- Inspect the merging unit visually to find any physical error causes.
- If you can find some obvious physical damage, contact ABB for repair or replacement actions.
- Check whether the error is external or internal.
- Check that the error is not caused by external origins.
- Remove the wiring from the merging unit and test the input and output operation with an external test device.
- If the problem remains, contact ABB for repair or replacement actions.