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Anonymous Poster

PLC Problem

09/08/2009 1:16 AM

Hi

I am having problem with s7 400 PLC. During the running condition it went to stop mode. Now when we try to communicate, it is not communicating. it seems the problem is with MPI port. kindly suggest if any other ways to communicate with the CPU.

Also want to know, is Memory card will affect the PLC when it was removed or inserted during running consition?

Looking forward for valuable suggestions
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Mikerho
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#1

Re: PLC Problem

09/08/2009 7:53 AM

Every time I've had a PLC problem, the MOST EFFICIENT WAY TO SOLVE IT has been to call the manufacturer. (even if was a mistake in my own programming)

Mike

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 "Reason is not automatic. Those who deny it cannot be conquered by it. Do not count on them. Leave them alone." - Ayn Rand
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Anonymous Poster
#2

Re: PLC Problem

09/09/2009 10:08 AM

Did you make restart by power? Did you make clean the memory?
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craigza
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Join Date: Nov 2008
Location: Johannesburg
Posts: 295
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#3

Re: PLC Problem

09/11/2009 2:32 AM

Hi there,

If you removed the memory card while the PLC was in operation or just powered - you have frozen it up. Common problem with the Siemens S7400. Put the memory card back in and do full memory reset (cold restart), then you will be able to download your hardware configuration and program back to the PLC via MPI.

Be carefull - as you might have damaged the memory card.

Kind regards,

Craig
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