NucorElec
Member
We are using PLC 5 and currently have "Temp Rate Change Alarm" that is basically doing a compare every 8 seconds and alarming on any change of over ten degrees. We have recently been getting some nuisance alarms due to noise or interference causing temporary spikes. I am trying to think through ways of writing the code so that the rate of change is either averaged over that scan time or at least that the alarm threshold has to be met (or sampled) twice over an 8 sec period before giving the alarm. Help me out gurus! Thanks!