中文版
Description
The essence of programmable logic controller is a kind of computer dedicated to industrial control, its hardware structure is basically the same as the microcomputer, the basic structure is described in detail as follows:
Power supply
The power supply is used to convert the alternating current into the direct current required inside the PLC. Most of the PLCS are powered by switching regulated voltage power supply.
Central processing unit
Central processing unit (CPU) is the control center of PLC, is also the core part of PLC, its performance determines the performance of PLC.
The CPU consists of a controller, an arithmetic device and a register. These circuits are concentrated in a chip, and are connected to the input/output interface circuit of the memory through the address bus and the control bus. The role of the central processing unit is to process and run user programs, perform logical and mathematical operations, and control the entire system to make it coordinated.
memory
Memory is a semiconductor circuit with memory function, its role is to store system programs, user programs, logic variables and some other information. The system program is to control PLC to achieve various functions of the program, written by the PLC manufacturer, and solidified to read-only memory (ROM), users can not access. [6]
Input unit
The input unit is the PLC and the controlled equipment connected to the input interface, is the signal into the PLC bridge, its role is to receive the main component, the detection component from the signal. Input types include DC input, AC input, and AC/DC input.
Output unit
The output unit is also the connection between PLC and the controlled device, its role is to send the PLC output signal to the controlled device, the central processing unit sent out of the weak signal into the level signal, drive the controlled device’s executive element. The output types are relay output, transistor output, gate output.
PLC in addition to the above parts, according to the different models there are a variety of external equipment, its role is to help programming, monitoring and network communication. Commonly used external devices are programmers, printers, cassette recorders, computers, etc.
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3. Specialized in DCS system, robot system, large servo control system, module of the world’s famous brands: BentlyNevada ABB, Emerson Ovation Honeywell DCS, Rockwel ICS TRICONEXFOXBOROSchneider PLC, GE Fanuc, Motorola, HIMA, Prosoft Woodward, MOOG, Rexroth and other imported industrial parts.
Advantage part model:
3700 Differential, DC coupled voltage: 0~5VDC input points: 32
3700A differential, DC coupled +6% over limit voltage: 0~5VDC input points: 32
Differential, DC coupled voltage: 0~10VDC Input points: 32
3703E Differential, isolated, +6% over limit voltage: 0~5 degrees 0~10VDC Input points: 16
3704E High density — Public, DC coupled, +6% over limit voltage: 0~5 degrees 0~10VDC Input points: 64
Analog output
3805E DC coupling, common return voltage: 0~20mA output number: 8
3805E DC coupling, common return voltage: 0~20mA, 6 points output 16~320mA, 2 points output number: 8
4200-3 Set of three modules for main RXM rack, multi-mode, up to 2 km Type: Fiber
4201-3 A set of three module types for primary RXM racks: Optical fiber
A set of three module types for a primary RXM rack: Optical fiber
4211-3 Set of three module types for primary RXM racks: Optical fiber
4119 MODBUS Printer for host or slave, TRISTAION, and centronics. Type: EICM
4329 TriStation, Peer-to-Peer,TSAA, and TCP-IP types: NCM
4409 Process type in Honeywell’s Universal Control Network (UCN) : SMM
4509 Node type in the Honeywell Data high-speed channel: HIM
4609 Processes in the IA Distributed Control System (DCS) in Foxboro – Critical Point Type: ACM
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