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摇臂钻床PLC的特点介绍

2020-07-27 15:20来源:未知浏览:

摇臂钻床PLC的特点介绍

1.PLC的基本组成

可编程控制器PLC的类型

PLC可分整体PLC和模块PLC.整体式PLC包括OMRON的C20P、C40P、CMP1A、CMP2A,MITSUBISHI的F、FI、F2、FXO、FX1N、FX2N和A、Q系列,日本松下的FP3他的结构示意图,如下所示

摇臂钻床PLC结构示意图

整体PLC是把寄存器、输入/输出(I/O)、CPU、电源电路以及通信端口组合在一个机体内;模块PLC是把上述单元分别做成对应模块,在应用时依据控制的要求安插在基架上,每个模块之间经过基架总线进行相互联系。同时,这类型PLC系统的灵活性高,能够组成不一样的控制规模、功能的PLC,可是价格较高。他的基本结构如下:

摇臂钻床PLC的基本框架图

 

三菱小型PLC最突出的产品是FX2系列可编程控制器,它拥有着85条功能指令。有输送比较、程序控制、数据操作、方便指令、高速处理、外部I/O处理和功能块控制类型。

三菱PLC的新种类——FX2N系列。它在可编程控制器FX2功能指令的基础上,新加入了浮点数运算、时钟功能和触电形比较指令,其数量能够达到128种298条。

 

2.三菱PLC的指令系统

 

1、输入继电器x

可以用输入继电器PLC来接收外部所输入开关信号,和PLC输入端子相连接3PLC经过光电耦合器,把外部输入信号读入,在输入映象的寄存器中存储。输入端能够外接常开触点、常闭触点,也能够接由多个触点构成的串、并联电路和电子传感器即接近开关。梯形图中,能够多次使用输入继电器常闭触点、常开触点。

2、输出继电器Y

可以用输出继电器PLC来向外部负载发送信号3输出继电器把PLC输出信号输送给输出模块,后由输出模块驱动外部负载,有一对常开触点和PLC输出端子相连,具有一定负载能力。

3、辅助继电器M

PLC辅助继电器,它的作用和继电器-接触器控制中的中间继电器差不多,可是PLC辅助继电器是软件实现,只能依靠程序驱动,各个辅助继电器能够有无限对常闭与常开触点供给编程使用3可是触点不能够直接地输出驱动负载。同时,辅助继电器有通用型、电池后备型两种。

4、移位寄存器

由上述的辅助继电器构成了移位寄存器。移位寄存器的辅助继电器编号是这个移位寄存器编号。

5、特殊的辅助继电器

专用的辅助继电器也就是特殊的辅助继电器,它共有156个点,可以表示PLC的一些状态,并提供时钟脉冲、标志,以及设定PLC运行的方式,或者在步进顺控、禁止中断、设定计数器是加计数器还是减计数上的运用。特殊辅助继电器有触点利用型、线圈驱动型。

6、定时器T

PLC定时器扮演着继电器控制系统中延时继电器的角色。

7、计数器C

它的计数值是编程器设定K值所决定。

8、状态器S

状态器S是编制步进控制程序中的基本元件。

 

 

1. Basic composition of PLC

Types of PLC

PLC can be divided into integral PLC and modular PLC. The integrated PLC includes c20p, C40P, cmp1a, cmp2a of Omron, F, fi, F2, FXO, FX1N, FX2N and a, q series of Mitsubishi, and FP3 of Panasonic of Japan. Its structure diagram is shown below

PLC structure diagram of radial drilling machine

The whole PLC combines registers, input / output (I / O), CPU, power supply circuit and communication port in one machine; module PLC makes the above units into corresponding modules, which are installed on the base frame according to the control requirements, and each module is connected with each other through the base frame bus. At the same time, this type of PLC system has high flexibility, can form different control scale, function PLC, but the price is higher. His basic structure is as follows:

Basic frame diagram of PLC for radial drilling machine

The most outstanding product of Mitsubishi Small PLC is FX2 series programmable controller, which has 85 function instructions. There are transport comparison, program control, data operation, convenient instruction, high speed processing, external I / O processing and function block control.

FX2N series, a new type of Mitsubishi PLC. On the basis of FX2 function instruction of PLC, floating-point operation, clock function and electric shock comparison instruction are added. The number of 128 kinds of 298 instructions can be reached.

2. Instruction system of Mitsubishi PLC

1. Input relay x

The input relay PLC can be used to receive the external input switch signal, which is connected with the PLC input terminal. The 3plc reads the external input signal through the optocoupler and stores it in the input image register. The input terminal can be connected with normally open contact, normally closed contact, series and parallel circuit composed of multiple contacts and electronic sensor, i.e. proximity switch. In the ladder diagram, the normally closed and normally open contacts of input relay can be used many times.

2. Output relay y

The output relay PLC can be used to send signals to the external load. 3. The output relay transmits the PLC output signal to the output module, and then the output module drives the external load. There is a pair of normally open contacts connected with the PLC output terminal, which has a certain load capacity.

3. Auxiliary relay M

The function of PLC auxiliary relay is similar to that of relay contactor control. However, PLC auxiliary relay is realized by software and can only be driven by program. Each auxiliary relay can have unlimited number of normally closed and normally open contacts for programming. 3. However, the contact can not directly output driving load. At the same time, there are two kinds of auxiliary relays: universal relay and battery backup relay.

4. Shift register

The shift register is composed of the auxiliary relay. The auxiliary relay number of the shift register is this shift register number.

5. Special auxiliary relay

The special auxiliary relay is also a special auxiliary relay. It has 156 points in total, which can indicate some states of PLC, provide clock pulse, mark, and set the operation mode of PLC, or use in step sequence control, forbid interrupt, and set whether the counter is added or subtracted. The special auxiliary relay has contact utilization type and coil drive type.

6. Timer t

PLC Timer plays the role of delay relay in relay control system.

7. Counter c

Its count value is determined by the K value set by the programmer.

8. Stater s

The state controller s is the basic element in the program of step control.

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