The composition of PLC control system

PLC control system of PLC control system, Programmable Logic Controller, Programmable Logic Controller is designed for industrial production of a kind of digital computing operations electronic device, it USES a Programmable memory, used for its internal storage procedures, to perform the Logic operation, sequence control, timing, counting and arithmetic operations such as user-oriented instructions, and through the digital or analog input/output control various types of machinery or production process. Is the core part of industrial control.

PLC control system of

( 1) CPU module

microprocessor (CPU module mainly mountain The CPU chip) And the memory. In PLC control system, the CPU module is equivalent to the human brain and heart, it constantly collecting input signal, the execution of user programs, the output of the refresh system; The memory used to store programs and data.

( 2) Input module

input module and output module IO module for short, they are contact bridge of external field and CPU module. Switch input module used for receiving and collection from the button, selector switch, digital dial the code switch, limit switch, close to switches, photoelectric switch, pressure relays, etc. To switch the input signal; Analog input module is used to collect all kinds of transducer and thermocouple, heat resistance to provide the continuous variation of the analog input signal.

( 3) Output module

PLC through the switch output module control relay, contactor to control, electromagnetic valve, electromagnetic valve and other equipment; Through to the PLC analog output module is used for the digital conversion for current or voltage, is proportional to the governor, the regulator to control such as actuators. IO module in addition to transmit signals, and level transformation and the effect of isolation.

( 4) Programming device

is mainly composed of programming software and programming cable. Programming software can be directly on the computer to generate and edit ladder diagram and instruction list program, the program is compiled by cable to download to the PLC controller programming, can also be shown on the program to the programming software of PLC towel.

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