Weekly Connection Loss to PLCs

Event Year: 2004 Reliability: Confirmed
Country: Switzerland
Industry Type: Other

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.


Loss of control on the production facility.

Action Description: The modules were exchanged and upgraded to the most recent firmware version after confirmation with Siemens. The problem has been solved by this.