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| 7/18/2012 9:41 PM | |
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Posts: 2 Rating:
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Need help with our PLC!!! We have been fighting an issue with our PLC going into system fault. We have to date completly replaced our PLC, including power supplies, mmc, profibus cables, backplane connectors, checked grounding and made further grounding as directed by Siemens technical support and three visits from Siemens PLC Tech's. Fault log continuously points to FM350 as the culprit. We have replaced the card as we have (4) to pick and choose from all the same. It is the 6ES7 350-1AH03-0AE0. This equipment has been in service for 7 years. We didn't even have access to the program until about a month ago and we have had this issue for over 2 months and it has been getting worse. So no one has had the ability to change any of the program to create this problem. The only thing that has been noticed is that the hardware configuration for the FM350 is set to 5 volts and we are giving the card a 24 volt pulse, the plug on the side is also set for 24 volts. This has been this way since the machine was commisioned 7 years ago. When the hardware config is changed to 24 volts as the plug is set on FM350 we lose our profibus communications. This was proved out by Siemens techs, They have no explanation either. So the hardware configuration is left in the 5 volt configuration and FM350 set as described with plug in the "D" position and being supplied with 24 volt pulses. When the Fm350 goes into SF, the processor goes into stop mode and then goes into SF also. Due to the way equipment is designed when the processor goes into SF we lose output power, which we should, then lose our DC bus which powers down the drives and then go into a profibus BF2 fault because we have no comms on profibus, which is normal. What is even stranger is the way the faults seem to go into a crazy fault loop and it is very difficult to get processor to reset back into run. Once we have the FM350 reset and not showing SF we can most of the time get everything to reset. Sometimes we can run for a couple days without problems and some days we can never get it to reset. I am willing to upload any information that is requested.I have included the program which should give all the details of our setup and configuration.
AttachmentCuttoff.zip (70 Downloads) |
Last edited by: tubeman at: 7/18/2012 10:30 PM |
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| 12/18/2013 2:53 PM | |
Joined: 9/1/2005 Last visit: 8/12/2024 Posts: 4104 Rating:
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new question published by AllanSoagis split to a seperate thread with the subject FM350 Counter module SF light on. Best regards CS Moderator |
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