micapp Posted June 28, 2014 Report Share Posted June 28, 2014 I have a problem with a valve control. The controlsignal is 4-20mA. The control works very good when PLS is running.4-20mA give decimal values 820-4095 on output. If I switch off the PLS, there is of course no value on output that is recognized as control signal by the valve, and it does not move (error condition on 4-20mA signal say that valve shall be in last position). The problem is when the PLS goes to STOP, the value on the PLS Memory Integer is still 4095 (fully open valve), but the output from V200-18-E18 give an output the the valve control read as GO tO 0% (closed posistion). Any idea what to do to get around this? Quote Link to comment Share on other sites More sharing options...
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