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Explain the role of watch dog timer in programmable logic controller.

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Watch dog timer is a type of timer used to protect maloperation of PLC. It independently works( starts counting internal clock pulses) each time when PLC starts its execution. User program must reset the timer some where in the program. If the user program stops working because of some fault or some unknown condition, then watch dog timer overflows and generates nonmaskable interrupt to reset PLC.

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