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▶ Want to learn industrial automation? Go here: http://realpars.com • ▶ Want to train your team in industrial automation? Go here: http://realpars.com/business • ▶ Check out the full blog post over at • https://realpars.com/wiring-diagram-t... • ============================= • In this video, you will learn how to convert a basic wiring diagram to a ladder logic PLC program. This can be a very handy skill to learn, especially if you are converting a machine to PLC control. • Upgrading a machine to PLC control may seem like a daunting task. However, if you take your time and learn the basics, it can be an easily achievable task. • I will walk you through programming a very basic “stop-start” circuit for an electric motor. This should help you get a handle on some of the basics. • First, let’s look at our basic start and stop diagram. I like to start on the left and follow the line. Each line represents a wire that is connected. • L1 is our 120v hot wire. It will run straight to the normally closed Stop button labeled PB1. • From the other terminal on PB1, it runs to a normally open PB2 which is our Start button. From the other terminal on PB2, a wire connects to the A1 terminal on the Motor Starter Coil. • The A2 terminal runs to the normally closed overload auxiliary contact. The next wire runs from the other overload terminal to neutral. • The next line down shows how a motor starter stays energized. One wire needs to be connected to the input terminal of the start push button. • It will run to one terminal of the auxiliary contact set on the motor starter. This ensures power is on the auxiliary contact. • The second terminal of the auxiliary contact is connected to the output side of the start push button. • When the start button is pushed, the circuit is complete and the motor starter will energize. This closes the auxiliary contact and allows the operator to release the start button. • The motor starter will now stay energized until the stop button is pressed and the circuit opens. • Programming software is all different but similar. Most have a toolbox somewhere that you will drag your contacts and coils from. • Just like on the diagram, we start with the stop pushbutton. It will be represented with an examine OFF bit. These look like a normally closed contact. • Drag it to the first ladder rung and the program will place it to the far left. This will be a stop push button. • Next, drag an examine ON bit and drop it to the right of the first bit. This looks like normally open contact and will be the start push button. • And continue to complete your PLC programming logic according to this simple start-stop wiring diagram. • To wrap it up, to program a simple motor start-stop circuit, we need to read the electrical diagram from left to right and open our toolbox on the programming software. • You will be using the most common bits in the examine ON, examine OFF, and output coil or output energize. • Again, the language is sometimes different between manufacturers, but the symbols pretty well look the same. • The bits will represent normally open and normally closed inputs, and a single output. You will also need to use a branch around one bit. This is basically a parallel circuit and OR logic. • The start push button OR the auxiliary contact will energize the circuit. • I hope this video has been helpful in the transition from wiring diagrams to plc programming. This was a very basic program that can run a motor. • ============================= • Missed our most recent videos? Watch them here: • https://realpars.com/ethercat • https://realpars.com/encoder • https://realpars.com/ethernet-ip • ============================= • To stay up to date with our last videos and more lessons, make sure to subscribe to this YouTube channel: • http://goo.gl/Y6DRiN • ============================= • TWEET THIS VIDEO https://ctt.ac/a3Ykh • ============================= • Like us on Facebook: / therealpars • Follow us on Twitter: / realpars • Follow us on LinkedIn / realpars • #RealPars #ElectricalWiringDiagram #PLC

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