译文：
两位五通电磁阀通常与双作用气动执行机构配套使用，两位是两个位置可控：开-关，五通是有五个通道通气，其中1个与气源连接，两个与双作用气缸的外部气室的进出气口连接，两个与内部气室的进出气口接连，具体的工作原理可参照双作用气动执行机构工作原理。 气动执行机构的几种控制方式 一、引言 气动马达作为一种执行机构，在工业生产和工业控制中起着很重要的作用。气动马达使用空气取代电力和液压来产生动力，可以实现无级变速，可瞬间启动、停滞和换向，具有自动冷却功能，无电火花，可在易燃易爆，如含有化学、易燃性或挥发性等物质湿热和多尘的环境下运行，如矿区、隧道、油漆厂、化学工厂、石化、生物科技、药厂、晶圆、半导体、光纤、兵工厂、船舶、养殖等行业用于驱动，因用空气作为动力，容易获得，用后空气可以直接排入大气无污染，压缩空气还可以进行集中供给和远距离控制。 二、气动阀门执行器工作原理 利用压缩空气推动执行器内多组组合气动活塞运动，传力给横梁和内曲线轨道的特性，带动空芯主轴作旋转运动，压缩空气气盘输至各缸，改变进出气位置以改变主轴旋转方向，根据负载（阀门）所需旋转扭矩的要求，可调整气缸组合数目，带动负载（阀门）工作。 三、气动阀门执行器的控制方式 由于现在的控制方式和手段越来越多，在实际工业生常和工业控制中，用来控制气动执行机构的方法也很多，常用的有以下几种。 （一）基于单片机开发的智能显示仪控制 智能显示仪是用来监测阀门工作状态，并控制阀门执行期工作的仪器，它通过两路位置传感器监视阀门的工作状态，判断阀门是处于开阀还是关阀状态，通过编程记录阀门开关的数字，并且有两路与阀门开度对应的4～20mA输出及两足常开常闭输出触点。通过这些输出信号，控制阀门的开关动作。根据系统的要求，可将智能阀门显示仪从硬件上分为3部分来设计：模拟部分、数字部分、按键/显示部分。 1、模拟电路部分主要包括电源、模拟量输入电路、模拟量输出电路三部分。 电源部分供给整个电路能量，包括模拟电路、数字电路和显示的能源供应。为了实现阀门开读的远程控制，需要将阀门的开度信息传送给其他的控制仪表，同时控制仪表能从远方制定阀门为某一开度，系统需要1路4～20mA的模拟量输入信号和1～2路4～20mA的模拟量输出信号。模拟量输入信号通过A/D转换变成与阀门开度相对应的数字信号后送给数字部分的单片机，在单片机中对它进行滤波处理后就可以输出了。阀门的开度信息通过D/A转换后变成模拟信号输出，用来接显示仪显示阀门开度或连接其他的控制设备。在本设计系统中，所有的数字量数据均采用串行的输入输出方式，为了节省芯片资源和空间，输入的4～20mA的模拟量在转化为数字量时，采用已有的4路DA芯片与单片机的系统资源相结合作8位的AD使用。 2、数字电路部分主要包括：单片机、掉电保护、两路监测脉冲输入信号、两路常开常闭转换触点输出。 在设计方案中选用目前普遍使用的51系列单片机AT89C4051。AT89C4051是一款低电压、高性能的CMOS8位微控制器，它具有4K字节的可擦除、可重复编程的只读闪存。通过在单芯片内复合一个多功能的8位CPU闪存，在性能、指令设定和引脚上与80C51和80C52xx兼容。 考虑到在系统掉电或重新启动时，需要保持先前在仪表中设置的一些阀门参数，而单片机中的数据存储器不具备掉电存储功能，所以在片外扩展了一个具有掉电保存功能的芯片X5045。X5045是一种集看门狗、电源监控和串行EEPROM3种功能于一身的可编程电路，这种组合设计可以减少电路对电路板空间的需求，X5045中的看门狗为系统提供了保护，当系统发送故障而超过设定时间时，电路中的看门狗将通过RESET信号向CPU作反应。X5045提供了三个时间值供用户选择使用。它所具有的电压监控功能还可以保护系统免受低电压的影响，当电源电压降到允许范围以下时，系统将复位，直到电源电压返回到稳定值为止。X5045的存储器与CPU可通过串行通信方式接口。共4069位，可以按512×8个字节来放置数据。 X5045的管脚排列如图1所示，它共有8个引脚，各个引脚的功能如下： CS：电路选择端，低电平有效； SO：串行数据输出端； SI：串行数据输入端； SCK：串行时钟输出端； WP：写保护输入端，低电平有效； RESET：复位输出端； Vcc：电源端； Vss：接地端。 当一路检测脉冲输入信号电路（另一路xx相同）。INA为输入信号，是由光电传感器采集到的阀门脉冲信号（<10ma>
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原文：
Two five-pass solenoid valve are usually associated with double-acting pneumatic actuator supporting the use of two control two locations: On - off, there is a five-channel 5-pass ventilation, of which one with the gas source connection of two pairs of the role of the external gas cylinder chamber and out of air intake connected to two internal air chamber and out of air intake connected, the specific works may refer to double-acting pneumatic actuator works. Several pneumatic actuator control mode 1 Introduction Pneumatic Motor as an implementing agency, in industrial production and industrial control plays a very important role. Pneumatic motor to replace the use of air to produce electricity and hydraulic power, can achieve variable speed can be instant start, stagnation and change direction, with automatic cooling function, no spark can be flammable and explosive, such as containing the chemical, flammability or volatile substances such as hot and humid and dusty environments to run, such as mines, tunnels, paint, chemical plants, petrochemical, biotechnology, pharmaceutical, wafer, semiconductor, optical fiber, arsenals, shipping, aquaculture and other industries to drive the due to using air as the driving force, easy to obtain, after using the air can be directly discharged into the atmosphere, non-polluting, compressed air can also be centralized supply and remote control. 2, pneumatic valve actuator works Promote the implementation of the use of compressed air inside combination of multiple sets of pneumatic piston movement, force transmission to the beams and inside the curve of the track characteristics, driven hollow spindle as a rotary movement, compressed air to drive the input of each cylinder to change the location and out of gas in order to change spindle direction, depending on the load (valve) rotary torque required to request the number of adjustable cylinder combination to drive the load (valve) work. 3, pneumatic valve actuator control mode Now that the ways and means of control, more and more frequently in actual industrial hygiene and industrial control, pneumatic actuator used to control many of the methods commonly used are the following. (A) Based on the development of intelligent display instrument MCU Control Intelligent display instrument is used to monitor the valve working condition, and controlling the implementation phase of the valve of the apparatus, through two-way valve position sensor to monitor the working state to determine the valve is in a valve open or closed valve state, through the programmed recording valve switch numbers, and there are two-way with the valve opening corresponding to 4 ~ 20mA output and two-legged normally open normally closed output contact. Through these output signals to control the valve switching action. According to system requirements, can be intelligent valve indicator is divided into three parts from the hardware design: analog and digital parts, key / display section. 1, analog circuit section includes power, analog input circuits, analog output circuit of three parts. The power part of the supply of energy throughout the circuit, including analog circuits, digital circuits and display of energy supplies. In order to achieve the remote control valve opening time needs to be opening the valve to control the information transmitted to other instruments, while controlling the distance from the instrument developed for a particular valve opening, the system needs a way of Analog 4 ~ 20mA input signal and a ~ 2-way 4 ~ 20mA analog output signal. Analog input signal through the A / D converter and the valve opening into a corresponding digital signal sent to digital part of the MCU, the MCU filtering it can be exported after processing. The valve opening information through the D / A converted into analog signal output, is used to pick up displays show the valve opening or connection to other control equipment. In this design system, all the digital data serial input and output are used, and in order to save chip resources and space, enter the 4 ~ 20mA analog volume converted to digital, the use of the existing 4-way DA chip and MCU system resources combined to make 8-bit AD use. 2, digital circuit parts include: microcontroller, power-off protection, two-way monitor the pulse input signal, two-way normally open normally closed contact output conversion. Chosen in the design of programs commonly used in the current 51 series microcontroller AT89C4051. AT89C4051 is a low-voltage, high-performance CMOS8-bit microcontrollers, it has a 4K-byte erasable, reprogrammable read-only memory. Compound in a single chip by a multi-purpose 8-bit CPU memory, in terms of performance, instruction set and pin compatible with the 80C51 and 80C52. Taking into account the power-down or restart the system, the need to maintain the previously set number of valve instrument parameters, while the microcontroller in the data memory does not have the power-down memory function, so extended a-chip to save power-down function Chip X5045. X5045 is a set of watchdog, power monitoring and serial EEPROM3 kinds of functions in a programmable circuit, such a modular design can reduce circuit board space requirements, X5045 in the watchdog for the system provides protection, When the system sends a failure exceeds a set time, the watchdog circuit through the RESET signal to the CPU to respond. X5045 offers three time value for users to choose to use. It has a voltage monitoring function can also protect the system from the effects of low-voltage, when the supply voltage dropped below the permissible range, the system will be reset until the supply voltage to return to the stable value so far. X5045 memory and the CPU via the serial communication interface. A total of 4069, can be 512 × 8 bytes to place the data. X5045 pin arrangement shown in Figure 1, it consisted of eight pins, each pin functions as follows: CS: Circuit Select end, low effective; SO: serial data output terminal; SI: Serial data input terminal; SCK: serial clock output terminal; WP: Write Protect input, low effective; RESET: Reset output; Vcc: Supply-side; Vss: Ground terminal. When all the way test pulse input signal circuit (the other way identical). INA as the input signal is collected by the photoelectric sensor to the valve pulse signal (<10ma>Float Control Valvesof performance indicators. (B) the use of PLC to control the system PLC in the control system of more and more widely, as the program is OMRON's PLC for the development of the above, so as to OMRON's PLC to be introduced. Hardware components: a computer, a set of PLC (including the CPU, I / O modules, ID212, OC224, AD003 module), two relays, two solenoid valves, a pneumatic valve actuators. Principles of its composition as follows: from the PC computer through RS-232 serial communications link OMRON's PLC, for PLC programming and monitoring. PLC's I / O modules separately access to input and output signals, which input module connected to the valve on the two position sensors, through the PLC's input module ID211 sequencing of the indicator light to show off status of the valve. Input module to receive two-way valve test pulse input, that is, pulse A and pulse B. Running state, the input pulse A light A bright light pulse B input B light. Enter the order of AB, said the open valve. Expressed concern for the BA input sequence valve. Valve test pulse signals A and B must be part of the stack, or can not properly detect the valve opening. Through the PLC-output module OC225 control two relays, relays with two normally open normally closed output contact, a group open valve output contacts, one group off valve output contacts. Open valve, when the valve opening is greater than or equal to the limit values established by the valve to open valve output contact action, the valve opening is less than the limit values set the valve to open valve output contact action, the invention the valve opening is less than the limit value is set to open valve when the output contacts reset. Off valve, when the valve off to zero and the 21s in no pulse input output contact moves off valve; if there 21s pulse input, then the output contact delay 21s off valve action. Through the relay pull-in solenoid valve to control the two switches, solenoid valve opened, will be able to control the pneumatic valve actuator allows the valve to do the appropriate action to open valves on or off valves. At the same time near the sensor to switch the valve re-transmission sent to the PLC in the situation, and with the required degree of valve opening to compare up to meet the requirements so far. Auto-zero and auto-Man: control system with auto-zero and auto-filled feature, when the valve opening is less than zero value or range of the valve opening away from the full-scale value is less than full-scale adjustment range, and the time of great than or equal to the value established by the settling time value, PLC automatic control valves for zero or auto-filled. In the experiment, from the valve position sensor on the calculation of the valve opening. When the valve first to leave the A sensor, left B sensor that valve in the closed valve. When the valve first to leave the B sensor, left A sensor that valve in the open valve. Sensors receives is a pulse signal, through the position sensor signals to record the collection of the valve on or off. In the host computer using the programming software CX-programmer to prepare ladder, and then downloaded to the PLC ladder run, in the upper machine configuration software to control and monitor the amount of the amount of valve switch configuration software interface can be entered ring values determined. After doing the configuration interface, open valve, off valves, stop, total switch control, the control and movement can be directly in the image of the configuration interface is very intuitive to operate. IV Conclusion Earlier described two kinds of pneumatic motor control method has been used for a number of petrochemical plants production control process and the requirements to achieve the desired function of control, MCU development system is simple and convenient control. Developed with the PLC control system, relatively large initial investment, but its stability and control accuracy, etc. than the microcontroller development system for the better.
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