[PLC wiring diagram] Also known as PLC hardware wiring diagram, it is to draw a picture of the PLC input and output terminals and the buttons, switches, indicators and other input and output devices in the control system. As with other control circuit diagrams, it is just that PLC is one of the devices. As shown below:
[PLC] is a programmable logic controller, which uses a type of programmable memory for its internal storage program, executes logic-oriented operations, sequence control, timing, counting and arithmetic operations and other user-oriented instructions, and through digital or analog Type input / output controls various types of machinery or production processes.
1. Take the Siemens 32-channel DO as an example, the wiring method is as follows:
Terminals 1, 11, 21, 31 are connected to the 24V + of the power supply, 2-9, 12-19, 22-29, 32-39, to one end of the relay coil, the other end of the relay coil and the terminals 10, 20, 30, 40, to the power supply 24V-, so that when the PLC Q point has an output, the corresponding output point acts, and the relay can also be driven. Connect the output between 12, but you don't have to look carefully. There is a power supply between the outputs. The two ends of the relay coil are connected to the Q point, the other end is connected to the negative electrode of the power supply, and the 1 terminal is connected to the positive electrode of the power supply. This power supply is generally 24V.
Second, take PLC control motor loop as an example to talk about peripheral control circuit design
The electrical control logic of the contactor for the full-voltage start control of the motor is realized by the AC contactor KM coil, the indicator light HL1, the thermal relay moving break contact FR, the stop button SB2, the start button SB1, and the contactor moving closing auxiliary contact KM through the wire connection .
After closing QS, press the start button SB1, the coil KM is energized and self-locking, and the auxiliary contact KM of the branch where the indicator light HL1 is located and the main contact in the main circuit are connected. HL1 is on and the motor M is started; press to stop Press the button SB2, the coil KM is powered off, the indicator light HL1 is off, and M stops.
Electric control circuit for full voltage starting of motor
a) Main circuit b) Control circuit
The main circuit of the full-voltage start control of the motor using the S7 series plc remains unchanged, and the thermal relay dynamic break contact FR, stop button SB2, start button SB1, etc. are connected to the PLC input interface as the PLC input device, and the AC contactor KM coil, indicator light HL1, etc. are connected to the PLC output interface as PLC output devices. The logic according to the system is realized by executing the user program written according to the requirements of the full-voltage control of the motor and stored in the program memory.
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