The difference between the self-locking and interlock - by PLC

self-locking, i. e. , relying on the contactor's own auxiliary contact and keep its coil electricity self-locking, now is in the contactor coil, use their normally open auxiliary contact keep return on state, general object is jealous of their control circuit. Such as the normally open auxiliary contact with the start button in parallel, so that when the start button, contactor, auxiliary contact closure, to maintain state, at this time to loosen the start button, contactor also won't lose electric disconnect. In general, the start button and auxiliary contact in parallel, in series a button and stop the role. Used to be start inching switch selection normally open contacts, do stop using the normally closed contact.

interlock, said is between several circuits, using some one auxiliary contact of the road, to control the other side of the coil circuit, to limit state maintained or function. General object is control of the other circuit.

PLC internal self-locking, interlocking, and contactor self-locking, interlocking, principle. Just soft PLC PLC controller program within the relay ( Register) , not real hard components. Since the lock is locked himself to live, the following figure, when I0. 0 conduction, Q0. 0 conduction; I0 even at this time. 0 disconnect, Q0. 0 or conduction. This is the lock.

interlock, two mutually lock, A open B broken, A broken B. Below, when I0. 0 conduction I0. 1 when closed, Q0. 0 conduction. If the I0. 1 also conduction, so Q0. 0 is not conduction. I0. 1 and I0. 0 form interlocking relationship.

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