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PLC 0 deactivating itself


Kim Hansen
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Umac system (pmac turbo controller cpu)

 

Would anyone happen to know what could cause PLC 0 to suddenly become disabled? I've already ruled out disable plc instructions as well as changes of I5.

 

Though rare, it happens in the midst of production for no apparent reason.

Servo movements aren't affected, and all of the other PLC:s stay up and running.

Global status flags looks normal. If i manually restart plc 0 then everything is ok again.

 

Any help/suggestions appreciated!

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  • 3 weeks later...

Check your code and make sure you're not writing to bit 22 of Y:$3100 by mistake:

 

 

 

Thank you for the suggestion, didn't know about this possibility to control the PLC execution. However, there are no M-variables assigned to this address and in this particular program there are no pointers/indexing so this probably isn't the issue.

 

If it keeps happening I will probably suggest a CPU exchange to rule out firmware/hardware issues.

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  • 4 weeks later...
  • 7 months later...

I had same problem,PLC0 stop running itself.Maybe 2~3 times one year.

 

I've deployed hundreds of Turbo PMAC2 (all varieties) systems, running a PLC0 and/or PLCC0: i5=3 and have never encountered this issue.

 

 

If not a code problem, possible H/W issue? Have you checked your CPU load while your system is running all axes and PLC0 activated?

 

Chris

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I had same problem,PLC0 stop running itself.Maybe 2~3 times one year.

 

I've deployed hundreds of Turbo PMAC2 (all varieties) systems, running a PLC0 and/or PLCC0: i5=3 and have never encountered this issue.

 

 

If not a code problem, possible H/W issue? Have you checked your CPU load while your system is running all axes and PLC0 activated?

 

Chris

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I had same problem,PLC0 stop running itself.Maybe 2~3 times one year.

 

I've deployed hundreds of Turbo PMAC2 (all varieties) systems, running a PLC0 and/or PLCC0: i5=3 and have never encountered this issue.

 

 

If not a code problem, possible H/W issue? Have you checked your CPU load while your system is running all axes and PLC0 activated?

 

Chris

 

Maybe it's difficulty to check the load while the system is running when this problem occurs. after all, just three times in one entire year.

what I feel strange is :Why are the same programs run time and time again over the days, but just several times, this problem comes out?

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I had same problem,PLC0 stop running itself.Maybe 2~3 times one year.

 

I've deployed hundreds of Turbo PMAC2 (all varieties) systems, running a PLC0 and/or PLCC0: i5=3 and have never encountered this issue.

 

 

If not a code problem, possible H/W issue? Have you checked your CPU load while your system is running all axes and PLC0 activated?

 

Chris

 

Maybe it's difficulty to check the load while the system is running when this problem occurs. after all, just three times in one entire year.

what I feel strange is :Why are the same programs run time and time again over the days, but just several times, this problem comes out?

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I had same problem,PLC0 stop running itself.Maybe 2~3 times one year.

 

I've deployed hundreds of Turbo PMAC2 (all varieties) systems, running a PLC0 and/or PLCC0: i5=3 and have never encountered this issue.

 

 

If not a code problem, possible H/W issue? Have you checked your CPU load while your system is running all axes and PLC0 activated?

 

Chris

 

Maybe it's difficulty to check the load while the system is running when this problem occurs. after all, just three times in one entire year.

what I feel strange is :Why are the same programs run time and time again over the days, but just several times, this problem comes out?

 

My thought with PMAC CPU load was while the system is functioning normally and PLC0 is running. What is the average and peak loads on the PMAC CPU..???

 

Regards,

 

Chris

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I had same problem,PLC0 stop running itself.Maybe 2~3 times one year.

 

I've deployed hundreds of Turbo PMAC2 (all varieties) systems, running a PLC0 and/or PLCC0: i5=3 and have never encountered this issue.

 

 

If not a code problem, possible H/W issue? Have you checked your CPU load while your system is running all axes and PLC0 activated?

 

Chris

 

Maybe it's difficulty to check the load while the system is running when this problem occurs. after all, just three times in one entire year.

what I feel strange is :Why are the same programs run time and time again over the days, but just several times, this problem comes out?

 

My thought with PMAC CPU load was while the system is functioning normally and PLC0 is running. What is the average and peak loads on the PMAC CPU..???

 

Regards,

 

Chris

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