Question

Q1 (30 pts) Design a state-based PLC program to control a motor. The system specification is as follows. • Press a normally open push button, the motor will start. Motor stop will stop after 5 minutes or a normally close push button is pressed. . When the motor is running, a read light is ON. When the motor is stopped, a green light is ON. Use the "Fail Safe" concept, i.e., if the wire of stop push button is disconnected, the motor cannot be started. Complete the following: 1. Define the inputs, outputs and states of the system described above. 2. Design this process control using state diagrams. You are required to clearly express each state of the system and describe the conditions for state-transitions. 3. Create complete ladder logie for the system.

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Answer 1

1 i. ii). Inputs norma sally open push button for start Motor normally close push Motor for stop motor Outputs:- Motor, RED Light, Green light and Timer circuit State of system Motor start run for 5 min J stop after smin OY stop P.B press RED light Green light on ON

If stap Idle P.B. is ressed StartP.B is pressed Motor stop Motor start ION OFF OFF GREEN Light ON RED Light after sin Timer 5min Start P.B stop PB W НИ T4:0 DN Motor Timer Base lofcon) TON Timer -CEN th t Timer T4:0 T4:0DN Preset Accum Stop PB HE МИ T4:0 EN T4:0DN RÉD light ㅓㅏ 나 TU:DN T4:0EW Stop P.B

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