PLC Programming Example on multi-motor control for beginners using Schneider Electric EcoStruxure Machine Expert Basic PLC software.
Please note, that this PLC example is for engineering students who are interested in learning and practicing the PLC exercises. The real-time industrial PLC programs will be designed with more safety and protection features.
Design a PLC ladder logic for the following application.
We are using three toggle switches to control three motors.
The following digital inputs (DI) are required in this example program. The assigned PLC DI addresses are also mentioned.
Switch 1: I0.0
Switch 2: I0.1
Switch 3: I0.2
The following digital outputs (DO) are required in this example program. The assigned PLC DO addresses are also mentioned.
Motor 1: Q0.0
Motor 2: Q0.1
Motor 3: Q0.2
The current flows through switch 1 as it is in true state. In false state, switch 3 and switch 4 also pass current to the outputs.
The current does not flow through switch 2 when it is turned ON. In true state Normally Closed contact breaks the circuit.
Switch 3 is a Normally closed contact. When turned On, it will not allow current to pass through it. As a result, none of the output will be ON.
You can watch the below PLC programming video to understand this example program. You can follow the steps from scratch and learn the program.
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