Allen-Bradley MicroLogix 1000 Programmable Logic Controller (PLC)
Suppose we have an Allen-Bradley MicroLogix 1000 controller connected to a pair of pushbutton switches and contactor controlling power to an electric motor as shown in this illustration:
This motor control system has a problem, though: the motor refuses to start when the “Start” pushbutton is pressed. Examine the “live” display of the ladder logic program inside this Allen-Bradley PLC to determine what the problem is:
Identify at least two causes that could account for all you see here.
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Credits : Tony R. Kuphaldt – under CC BY 1.0
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Also, wire connecting start button failed open or start button is defective.