The main modules (PLC System composition chart)

PLC controller mainly consists of CPU module, input module, output module and the programmer ( See figure 1) , some PLC can also be equipped with special function module, used to complete the specific task. CPU module, CPU module is mainly composed of the microprocessor ( The CPU chip) And the memory. Factory in the PLC control system CPU module is equivalent to the human brain, it constantly collecting input signal, execute user programs, the output of the refresh system; The memory used to store programs and data. 2. The I/O module input, 1 nput) Module and output ( 输出) Module is referred to as the I/O modules, they are system of eyes, ears, hands, feet, is a bridge to link the external devices and the CPU module. Used to receive and gathering input signal input module, switch input module is used to receive from the button; Selector switch, digital dial the code switch, limit switch, proximity switch, photoelectric switch, pressure relay of switch quantity input signal; Analog input module is used to receive potentiometer, tachogenerator, and provide a variety of transmitter of continuous analog current and voltage signals. Switch output module is used to control contactor, electromagnetic valve, electromagnetic valve, lights, digital display device and alarm device output devices, such as analog output module on hand to control the regulator, frequency converter device. Figure 1 schematic drawing of PLC control system of CPU module working voltage is 5 v, and the PLC controller input/output signal voltage generally higher, such as 24 v dc and ac 220 v. The introduction of the peak voltage and interference from outside noise may damage the components of CPU module, or makes the PLC can't work normally. In the I/O module, optical coupler, photoelectric thyristor devices such as relays, small to isolate the PLC's internal and external I/O circuit, I/O module in addition to transmit signals, and level transformation and the effect of isolation. Programmer programming is used to generate the user program, and use it to edit, inspect and modify and monitor the implementation of the user program. Handheld programmer can't direct input and edit ladder diagram, can only input and edit the instruction list program, so they are called instruction programmer. Its small volume, price cheap, are commonly used to give small PLC programming, or used for commissioning and maintenance. The use of programming software can be directly generated on a computer screen and edit ladder diagram and instruction list, function block diagram and the sequence function diagram program, and can realize the transformation of different programming languages. Download program is compiled to PLC, also can upload program of PLC to the computer. Program can save or print, through the network, but also can realize remote programming and send. Power PLC controller generally use 220 v ac power or 24 v dc power supply. Within the switching power supply for each module provides DC 5 v, + 12 v, 24 v DC power supply, etc. Generally a small PLC can for the input circuit and external electronic sensors ( Such as proximity switch) 24 v dc power supply, drive with PLC load dc power generally provided by the user.
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