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PLC Program using START and STOP Buttons

PLC START and STOP Buttons

Write a PLC Program using START and STOP Buttons for the following plc example. 

There are three machines, each with its own start and stop buttons.

Any two machines may run at one time (also, any one may run by itself).

Each start button is to have a sealing circuit.

Construct a PLC circuit with appropriate interlocking for this problem.

PLC Ladder Logic :

PLC Program using START & STOP Buttons

You can share the detailed explanation of above PLC ladder logic with comments section.

Author :  Dr. D. J. Jackson

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