Weekly Connection Loss to PLCs
- Event Year
- 2004
- Reliability
- Confirmed
- Country
- Switzerland
- Industry
- Other
Description
Occasional communication connection loss to the PLC hindered the smooth running of the temperature monitoring system. The affected Siemens PLC (CP343-1) needed to be power cycled to restore its operation. The frequency has been about once a week without any regularity. Current suspect is a malformed packet accepted by the PLC, but this has never been confirmed.
Impact
Loss of control on the production facility.