Write a PLC program that when a start push button is pressed all the 3 motors are ON and after 3 seconds the first motor shutdowns automatically, then after 7 seconds the second motor shutdowns automatically, and after 12 seconds the last motor shutdowns automatically. At any time if the stop pushbutton is pressed all the three motors are shutdown.
Note the best practice to learn the PLC programming is to start writing the PLC program, take your time before you review the answer.
I0.0: start push Button (Normally open contact)
I0.1: Stop Push Button (Normally Closed Contact)
Q0.0: Motor 01
Q0.1: Motor 02
Q0.2: Motor 03
T1: Timer 01
T2: Timer 02
T3: Timer 03
S_PEXT (Extended Pulse S5 Timer) starts the specified timer if there is a positive edge at the start (S) input. A signal change is always necessary in order to enable a timer.
The timer runs for the preset time interval specified at input TV even if the signal state at the S input changes to “0” before the time interval has elapsed. The signal state at output Q is “1” as long as the timer is running.
The timer will be restarted (“re-triggered”) with the preset time value if the signal state at input S changes from “0” to “1” while the timer is running.
The timer is reset if the reset (R) input changes from “0” to “1” while the timer is running. The current time and the time base are set to zero.
Note: When we press the Start pushbutton for the first time, then all the motors will be turned ON and runs. In the next networks, I am discussing what will happens for the first time when we press the start push-button.
Note: For our simple example, we used motors shutdown time in seconds. In practical industrial applications, it will be in hours, minutes, and seconds depends on our requirements.
Author: Karim Ali Anwar
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