Ashtyl
Member
New system installed, I was not involved in programming or installation, but I'm being tasked with making it work. There are 3 inputs on card being powered off an external 24vdc power supply. (1) pressure transmitter (2) flow meter (3) tank level. Once Plc is powered up all all analog signals are correct, but after approximately 1 1/2 hours without any system changes all of the analog signals displayed on panel view are reading max values. During this time I've checked each instruments 4-20ma readings and they are correct. If I power down Plc for 20-30 minutes problem is gone, but returns in the next hour or so. Has anyone seen this before ????