At present, plc is a centralized control device with high usage rate in industrial production and automation control. PLC replaces heavy relay cabinets, AC contactor cabinets, etc., and is gradually used in production and control. The correct wiring of PLC is PLC. To fulfill the functional prerequisites, it is necessary for every electric power worker to master the wiring of the PLC input port and output port skillfully. Under normal circumstances, the PLC power input is connected to AC220V to provide PLC with running power. PLC output power port is generally DC24V, which is the PLC's own power output. During the use of PLC, the correct wiring between input and output terminals is very important. Correct wiring is the premise of PLC operation. Here we focus on analyzing the PLC input and output common wiring types:
First, the input port common wiring types and objects: PLC input port is generally input: 1, switch signal: button, limit switch, transfer switch, proximity switch, dial switch and so on. A simple example makes it easier to make it clear:
2, analog signal: generally for all types of sensors, such as: pressure transmitter, level transmitter, remote pressure gauge, thermocouple and thermal resistance and other signals. Analog signal acquisition equipment is different, equipment line system (two-wire system or three-wire system) is different, the wiring method will be slightly different. as the picture shows:
Second, the output port wiring. PLC output port wiring can generally be divided into the following three situations: 1, relay output. 2, transistor output. 3, thyristor output.
Third, three common sense in the PLC connection process: 1, PLC power circuit. PLC control system power supply in addition to AC power, but also includes PLC DC power supply, in general, PLC AC power supply can be directly supplied by the mains, and input equipment (switches, sensors, etc.) DC power supply and output equipment (relay) DC For power supplies, it is best to use a separate DC power supply. Most PLCs come with a 24V DC power supply. Only when the current required by the input device or output device is not very large, can you use the PLC's own DC power supply.
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