What is the maximum total load I can run in a PM866?
I Have a PM866 running with cyclic load at 60% and total load at 100%. Up to now, it seems I have no problem. Can I rum my plant in this situation? What is the consequences?
Asked 6 months ago
Answers
1
Cyclic load cannot exceed 70% (the firmware will ”auto break” your applications if needed)
Total load is cyclic load + internal tasks + networking. One of the most contributing internal task is modulebus scanning, a setting that should be made with care. 0ms=as fast as possible.
ABB recommend running the modulebus twice as fast as the fastest modulebus dependent application. If task is 250ms, set modulebus to 125ms.
The rest is network communication with other controllers and OPC servers.
ABB recommend not exceeding 90% total load. Overload may cause network issues (missed communication, uncertain or bad OPC quality, etc).
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