Weekly Connection Loss to PLCs
| Event Year: | 2004 | Reliability: | Confirmed |
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| Country: | Switzerland | ||
| Industry Type: | 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. |
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| Impact: | Loss of control on the production facility. |
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| 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. | ||