Method for converting PLC program into common Petri net
A program conversion and programming logic technology, which is applied in the program control of sequence/logic controllers, electrical program control, etc., can solve the problems of unverified state, cumbersome program design and debugging workload, industrial control system scale and structural complexity growth and other issues
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[0080] The present invention is described in detail with the second embodiment "motor forward and reverse circuit".
[0081] Such as Figure 7 As shown, SB1 and SB2 are manual switches, and KM1 and KM2 are relay coils, respectively indicating the forward and reverse working states of the motor. Figure 8 It is the external wiring circuit diagram controlled by PLC. The input terminal I0.0 of one PLC chip is connected to SB1, the output terminal Q0.0 is connected to relay coil KM1, the input terminal I0.1 of the other PLC chip is connected to SB2, and the output terminal Q0.1 is connected to Relay coil KM2. from Figure 9 It can be seen from the PLC ladder diagram program, which illustrates a simple method of interlocking program outputs. When the manual switch SB1 is pressed, the I0.0 contact is closed, the relay KM1 is energized, and the motor rotates forward; when the manual switch SB2 is pressed, the I0.1 contact is closed, the relay KM2 is energized, and the motor rotate...
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