Instead of 0 or 1 only, we have values in between.
In analog, we consider an INFINITE number of values. This simplifies input-output relationships as compared to the analog side of things. This means that it’s either “True or False”, “High or Low”, “Yes or No”, “0 or 1”. Logic circuits are digital, so they produce outputs that are discrete in nature. PLC Programming was based on Relay Logic, and Relay Logic was based on-well, the fundamentals of logic. The next step is actually designing a program for your controller to execute the steps required to perform your automated control system.īut first, you have to know some logical fundamentals that will allow your system to create decisions on its own.
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.
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