Siemens 6ES7 313-5BF03-0AB0 High speed counter issues

DColley

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Aug 2008
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Sproatley
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Hi, I am currently using a Siemens Simatic S7 313 PLC with built in high speed counters. The issue I have is that the counter appears to increase / decrease at random. i.e. quadrature encoder connected but not rotating. Has anyone experienced such problems, is the counting unit suspect to interference, the cable utilised on the encoder is screened.
Thanks
 

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