digispark

In most situations and simple control loops, P&I control is enough. What type of heater is it? How is heat applied and controlled? Where are your sensors mounted in relation to your heater? It sounds like your sensor has considerable amount of lag before you see a change in PV. All those are consideration of how much P and I you need. Try to measure a manual step response change. With a stable temperature, set manual heating output value, measure the time before you see a change in temperature. Keep an eye of the temperature and see if it stablelise (or close to limits), then turn off heat control. how long does it take to settle down again or does it keep rising?

Hi chelton, There is no routing table setup in the plc. I tried setting primary server to 0/1/0 ... no luck, still same 'cannot talk' error. Secondary server is offline as I only have one citect development licence right now.

Hello everyone, I'm fairly new to the world of HMI / SCADA automations. I have a job interview coming in by next month and would like some help to some readings or materials for preparations. I've got little bit of experience in Citect SCADA and not much in PLC programming. Job is for a junior engineer starting off with PLC programming and HMI/SCADA designs. If anyone could give some pointers on what to expect in the interview questions and/or preparation tips would be much appreciated. Thanks