Physical structure of PLC is introduced

Depending on the hardware structure, PLC can be divided into integrated, modular, and hybrid. 1. Monolithic integrated PLC and called unit or chassis type, its small volume, low price, the box body type PLC, there is a piece of CPU board, I/O board, display panel, memory blocks, power supply, etc. , of course according to the CPU performance is divided into several types, and according to the I/O points and some specifications. With modular PLC, CPU module, I/O module, memory, power supply module, or the frame. Which contain the structure type of PLC, belong to bus type open structure, its I/O capabilities according to user needs to extend and combination. 2. Modular PLC generally adopts modular structure, large and medium-sized PLC system is composed of frame and module, the socket module in the module, the latter welding bus connection plate in the frame frame for users to choose different slot number, if a rack can hold chosen module, can add one or several extended frame, with interface module and cable connected between each frame. The user can choose different grades of CPU module, a great variety of I/O module and special function block, is bigger to the choice of the hardware configuration, maintenance is also easy to replace the module. 3. Storage memory is divided into system program memory in the CPU module and the user program memory, the system program is equivalent to a personal computer operating system, it make the PLC basic intelligence, designers can finish the PLC regulation of all kinds of work. System programming by PLC manufacturers design and immobilized in ROM ( Read only memory) The user can't read. The user program designed by the user, it make the specific function of the PLC controller to complete the user to the ball, the user program memory size in bytes ( B） As the unit. ( 1) 。 Random access memory ( RAM) Users can use the programming device to read the contents of the RAM, and the user program can be written to RAM, so RAM also called read/write memory. The work of RAM speed high, the price is cheap and convenient. ( 2) 。 Read-only memory ( ROM） The content of the ROM can only read, can't write. ( 3) 。 Can electric polishing the programmable read-only memory ( EEPROM） S7- 200 block in EEPROM to store the user program and long-term preservation of important data. 4. All I/O points I/O module on/off state of using light emitting diode ( 领导) Shows that PLC controller and wiring connection terminals, is commonly used in some modules using detachable type socket terminal board, do not need to disconnect cable on the terminal board, can quickly replace the module. Input module: PLC through to receive and gathering input signal input module, output module control contactor, electromagnetic valve, electromagnetic valve, speed regulating device, such as actuators, another kind of PLC control the external load is light, digital display device and alarm device, etc. In the input circuit has a RC filter circuit, in order to prevent due to the input contact shake or external disturbance pulse error caused by the input signal. Output module, output module ratio amplifier with high power and field effect transistor ( Driven dc load) , bidirectional thyristor ( To drive the ac load) And small relay, relay can drive ac load or dc load. Output current of the typical value is 0. 5 - 2 a, the load power is provided by external field.
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For details on plc manufacturers, see Shenzhen Coolmay Technology Co., Ltd. at Coolmay PLC.
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