I found this helpful video that actually shows a control problem to solve: Lastly, you would want to control an input valve to regulate the flow of water into your tank. In this case, because there are water levels involved, you must use level sensors: One for the Full level and one for the Near Empty level. What do you do?īecause you have clearly identified what outcomes you want along with the conditions, you now have to think the appropriate types of sensors and output devices that you must use. You want the tank to fill up until it is full and then automatically refill one the water level is near empty just to maintain the pressure. This means that the final outcomes must be determined clearly along with the conditions that determine the outcome.Īlso, the input and output devices must be clearly identified.įor instance, you want a control system for your water tank. 4.5 Equivalent Ladder Diagrams for Logical Functionsīefore you start programming your PLC, or in fact any controller, you must begin with the end in mind.3.4.2.1 Normally open and Normally Closed Inputs.3.4.1 Parts of a ladder logic diagram and how it works.3.1 What is a PLC programming language?.3 IEC61131-3 Standard: PLC programming languages.
#Cx programmer instruction list how to
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