605-707109-012 LAM Plc网络接口模块

产品细节：605-707109-012 LAM Plc网络接口模块

什么是PLC？

可编程逻辑控制器（Programmable Logic Controller，简称PLC），一种具有微处理器的数字电子设备，用于自动化控制的数字逻辑控制器，可以将控制指令随时加载存储器内存储与运行。可编程控制器由内部CPU，指令及数据存储器、输入输出单元、电源模块、数字模拟等单元所模块化组合成。PLC可接收（输入）及发送（输出）多种类型的电气或电子信号，并使用他们来控制或监督几乎所有种类的机械与电气系统。

国际电工委员会（IEC）在其标准中将PLC定义为：
可编程逻辑控制器是一种数字运算操作的电子系统，专为在工业环境应用而设计的。它采用一类可编程的存储器，用于其内部存储程序，执行逻辑运算、顺序控制、定时、计数与算术操作等面向用户的指令，并通过数字或模拟式输入/输出控制各种类型的机械或生产过程。可编程逻辑控制器及其有关外部设备，都按易于与工业控制系统联成一个整体，易于扩充其功能的原则设计。
美国通用汽车公司在1968年提出了著名的“通用十条”招标指标，也是当前PLC的特点：

• 编程方便，现场可修改程序；
• 维修方便，采用模块化结构；
• 可靠性高于继电器控制设备；
• 体积小于继电器控制设备；
• 数据可直接送入计算机；
• 成本可与继电器控制设备竞争；
• 输入可以是交流115V；
• 输出为交流115V，2A以上，能直接驱动电磁阀，接触器等；
• 在扩展时，原系统只要很小变更；
• 用户程序存储器容量能扩展。

1978年美国电机制造协会（NEMA）对可编程控制器定义是[1]：
可编程控制器是一种以数字动作之电子设备，它使用可编程存储器以存储指令，运行像是逻辑、顺序、计时、计数与演算等功能，并透过数字或模拟输入输出模块，控制各种的机械或工作程序。

PLC具有通用性强、使用方便、适应面广、可靠性高、抗干扰能力强、编程简单等特点。

一切的PLC由三个主要部分组成：输入，CPU和输出。

605-707109-012

What is a PLC?

Programmable Logic Controller (PLC), a digital electronic device with a microprocessor, is a digital logic controller used for automatic control, which can load control instructions into memory storage and operation at any time. The programmable controller consists of internal CPU, instruction and data memory, input and output unit, power module, digital analog unit modular combination. PLC can receive (input) and send (output) many types of electrical or electronic signals, and use them to control or supervise almost all kinds of mechanical and electrical systems.

The International Electrotechnical Commission (IEC) defines PLC in its standards as:
The programmable logic controller (PLC) is a digital arithmetic operated electronic system designed for use in industrial environments. It uses a class of programmable memory for its internal store of programs, performs user-oriented instructions such as logical operations, sequence control, timing, counting and arithmetic operations, and controls various types of machinery or production processes through digital or analog input/output. The programmable logic controller and its related external equipment are designed according to the principle of easy to be integrated with industrial control system and easy to expand its function.
In 1968, the American General Motors Company put forward the famous “Ten General bidding indicators”, which are also the characteristics of the current PLC:
Convenient programming, site can modify the program;
Easy maintenance, modular structure;
The reliability is higher than relay control equipment;
Smaller than the relay control equipment;
Data can be directly fed into the computer;
Cost competitive with relay control equipment;
The input can be AC 115V;
Output AC 115V, 2A above, can directly drive the solenoid valve, contactor, etc.;
When scaling, the original system only needs a small change;
User program memory capacity can be expanded.
In 1978, NEMA defined programmable controller as [1] :
A programmable controller is a digital acting electronic device that uses programmable memory to store instructions, runs functions such as logic, sequence, timing, counting and calculation, and controls various mechanical or working procedures through digital or analog input/output modules.

PLC has the characteristics of strong versatility, easy to use, wide adaptability, high reliability, strong anti-interference ability, simple programming and so on.

All PLC consists of three main parts: input, CPU and output.

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