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Possible Problem With Isa Pid Auto In Cscape 9.3 Sp3


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I have been working on some pump control software using CScape 9.3 SP3 and IEC 61131-3 Structured Text, and was using the ISA PID with Auto tune.


I found that i) auto tune would not work and ii) the PID would sometimes just freeze.

Changing the PID to the Ind PID with Autotune overcame the problem completely.

The code was not changed, so this suggests that the ISA PID has a problem.


Initial testing in the Lab appeared OK, but the problem showed up big time in the field.


The code was running on an HE XE102 with firmware 12.86


Best regards,


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