2/8/2012 9:50 AM | |
Joined: 4/24/2006 Last visit: 8/19/2024 Posts: 8718 Rating:
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Hello KD.. The Frequency converter should have a parameter to monitor the status of Profibus Master. (When the Control word is 0 for some time it will stop Frequency converter) Perhaps this link might help: /tf/WW/en/Posts/38108 Best regards, Wizard |
2/8/2012 2:32 PM | |
Joined: 4/24/2006 Last visit: 8/19/2024 Posts: 8718 Rating:
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Hello KD.. Perhaps the manufacturer of the Pumpdrive might know how to proceed? Best regards, Wizard |
2/10/2012 2:09 AM | |
Joined: 10/7/2005 Last visit: 8/19/2024 Posts: 3016 Rating:
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Hello KD.. your problem is that you need a write a value of 4 to stop the drive, which - I'm afraid to say - is not a very failsafe value. The DP Master of an an S7 PLC is set to so called "Clear" state when you stop the CPU. In the clear state, the DP Master will still poll the DP Slaves (your bus is still "healthy") and the do one of the following: 1.) DP Slaves GSD entry for"Fail_Safe" = 0: DP Master sends all Outputswith zero values cyclically to the DP Slave Note: This also applies if the optional Fail_Safeentry has been ommited from the GSD file. 2.) DP Slaves GSD entry for"Fail_Safe" = 1: DP Master does NOT send the outputs, but instead sends cyclically ashort message to let the DP Slave know that it isclear state. I suggest you talk to your Drive supplier what can be done, as your driveshould be able to handle this and go to a "failsafe" state (i.e. STOP, if not, I suggest you get the supplier to develop a new PB interfacefor it or get a drive that does support this). I hope this helps |
Cheers |
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