AC800M Profibus error handling
A system with ACS800 controlled by AC800M via Profibus (CI854, RPBA-01) should have some tolerance for the Profibus communication interference.
In case the controller doesn’t receive the message from slave
- how to delay controller’s communication fault state 500ms? Is it done with CI854 Watchdog time configuration?
- what will be the values of communication variables; will they remain latest values or have zero values?
Thank you.
In case the controller doesn’t receive the message from slave
- how to delay controller’s communication fault state 500ms? Is it done with CI854 Watchdog time configuration?
- what will be the values of communication variables; will they remain latest values or have zero values?
Thank you.
Asked 8 months ago
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Answered 8 months ago
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Hello
- how to delay controller’s communication fault state 500ms? Is it done with CI854 Watchdog time configuration?
Watchdog Time configuration is directly dependant on Baud Rate of Profibus.
If you are considering only a particular CI854 master then you can go for watchdog timer settings matching with baud rate.
If entire CI854 state needs to be changed then it is better to visit web server and there you can set the required parameters.
- what will be the values of communication variables; will they remain latest values or have zero values?
If there is a communication break between Controller and CI then you must always enable web server and record the CEX logs in Create report tab.
There might be influence of electrical signals passing which leads to Communication break.
The values of communication variables will be depending upon the variable attribute that you are moving as a communication variable.
If attributes are retain, then values will become 0 after cold restart if attributes are cold retain then it will take the values given in Initial Value tab.
You can also use Start Value Analyzer Tool to dump all the current/communication values before cold restart of the controller and then you can compare it in the same tool via excel.
- how to delay controller’s communication fault state 500ms? Is it done with CI854 Watchdog time configuration?
Watchdog Time configuration is directly dependant on Baud Rate of Profibus.
If you are considering only a particular CI854 master then you can go for watchdog timer settings matching with baud rate.
If entire CI854 state needs to be changed then it is better to visit web server and there you can set the required parameters.
- what will be the values of communication variables; will they remain latest values or have zero values?
If there is a communication break between Controller and CI then you must always enable web server and record the CEX logs in Create report tab.
There might be influence of electrical signals passing which leads to Communication break.
The values of communication variables will be depending upon the variable attribute that you are moving as a communication variable.
If attributes are retain, then values will become 0 after cold restart if attributes are cold retain then it will take the values given in Initial Value tab.
You can also use Start Value Analyzer Tool to dump all the current/communication values before cold restart of the controller and then you can compare it in the same tool via excel.
Answered 2 months ago
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