![]() ![]() Please experience the application fun along the command for beginners. Its reliable action is to cut off the reverse rotation when it is pressed, and then start the forward rotation after it is released, so as to realize the safe and reliable forward reverse conversion. The action is: when the forward start button i0.2 is pressed - the open point of i0.2 is connected - the close point of i0.2 is disconnected - ensure that the reverse output q0.2 is cut first - the close point of q0.2 is connected - when the i0.2 button is released - its falling edge signal is connected - the output of q0.1 is connected and self-protection - realize forward operation. The following procedure: when the reverse output q0.2 is working, switch to the forward mode, so that the output of q0.1 is 1, ![]() The use of PLC falling edge command and switch interlock mode can reliably ensure that when the forward or reverse switch is pressed, the output of the other direction can be cut off first, and the required direction output can be connected only after letting go. We know that the safest problem of the motor forward and reverse control circuit is that the forward and reverse transfer contacts must not be switched on at the same time, otherwise 380V direct short circuit accident will occur. Today, we introduce a case of direct and reliable switching motor forward and reverse program. Learning PLC, along the application of instructions is indispensable, it brings us a lot of convenience programming.
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