描述

詳述了影響可編程序控制器控制系統(tǒng)可靠性的主要因素，并就可編程序控制器的工作環(huán)境、電源的要求、接地和連接線的方式、冗余設(shè)計(jì)和降級操作設(shè)計(jì)、控制系統(tǒng)的輸入電路和輸出電路與可編程序控制器的軟件程序編制等多個(gè)方面，提出了一些可行的方法和措施。通過對可編程序控制器的控制系統(tǒng)實(shí)際測試和多次試驗(yàn)，得出了幾個(gè)適合生產(chǎn)環(huán)境、能符合控制系統(tǒng)要求的改進(jìn)線路，從而使可編程序控制器控制系統(tǒng)的可靠性得到進(jìn)一步的提高。

0、引言

可編程序控制器（以下簡稱PLC）是在程序控制器和微機(jī)控制器的基礎(chǔ)上發(fā)展起來的微機(jī)技術(shù)和繼電器常規(guī)控制概念相結(jié)合的產(chǎn)物。從廣義上講，PLC是一種計(jì)算機(jī)系統(tǒng)，比一般計(jì)算機(jī)具有更強(qiáng)的與工業(yè)過程相連接的輸入輸出接口，并已成為自動(dòng)化控制系統(tǒng)的基本裝置。PLC已經(jīng)廣泛應(yīng)用于機(jī)械、冶金、化工、汽車、輕工等行業(yè)中，已基本取代了傳統(tǒng)的繼電器和接觸器的邏輯控制。用PLC來控制系統(tǒng)設(shè)備，其工作的可靠性要比單純繼電器和接觸器控制大大提高。就PLC本身而言，平均無故障時(shí)間一般已可達(dá)3~5萬小時(shí)；而三菱的F系列，據(jù)稱其平均無故障時(shí)間已達(dá)30萬小時(shí)。所以，整個(gè)PLC控制系統(tǒng)的可靠性，主要取決于PLC的外圍設(shè)備，比如輸入器件中的行程開關(guān)、按鈕、接近開關(guān)，輸出器件中的接觸器、繼電器和電磁閥等。另外，從軟件程序的編制來考慮，如果能編制出一個(gè)帶有監(jiān)控的程序，對提高系統(tǒng)的可靠性也有很大好處。下面就如何提高PLC控制系統(tǒng)的可靠性進(jìn)行一些探討。

1、從PLC的外圍設(shè)備來考慮提高PLC的可靠性

歐美品牌停產(chǎn)的，常用的“PLC”備品備件

我司產(chǎn)品應(yīng)用于以下領(lǐng)域：

1,《發(fā)電廠DCS監(jiān)控系統(tǒng)》

2,《智能平鋼化爐系統(tǒng)制造》

3,《PLC可編程輸送控制系統(tǒng)》

4,《DCS集散控制系統(tǒng)》
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5,《智能型消防供水控制系統(tǒng)》

6,《化工廠藥液恒流量計(jì)算機(jī)控制系統(tǒng)》

7,《電氣控制系統(tǒng)》造紙,印染生產(chǎn)線,變電站綜合自動(dòng)化控制系列

本特利，英維思，伍德沃德，福克斯波羅、西屋、瑞恩、施耐德莫迪康、ABB、AB、西門子、摩托羅拉、GE發(fā)那科、安川、博世力士樂，ACSO，力士樂等各大品牌的DCS系統(tǒng)配件，機(jī)器人系統(tǒng)配件，大型伺服系統(tǒng)備件。

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RVSI 53115 REV K,61266 REV B,61263 REV A

CENTENT CNO165 HIGH RESOLUTION MICROSTEP DRIVE

FUJI 4800 VME-48316-32F Rev F Vision Processing Board

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Intel D52657-303 PCIe Memory Expansion with 8GB FBDIMM

Agilent 86205A RF Bridge 50Ohm 300kHz to 6GHz

TAMAGAWA TBL-I SERIES AC SERVO MOTOR TS4509N3920E200

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National Instruments NI SC-2062 8-Channel Relay Board

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Advantech FPM-3150G-R 15 inch touch screen Flat Panel

Phoenix Contact MCR-SWS/U MCR-SWS Threshold Switch

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PRO-FACE GP37W2-BG41-24V TOUCHSCREEN GRAPHIC PANEL 24V

4 HP NC7170 Dual Port Gigabit Ethernet Card 313586-001

Yaskawa AC Servo Motor SGM-08AAF J12 750W 3000rpm

DELL Y8132 Poweredge 2950 Redundant PSU 750W N750P-S0

ADCOS VME-A100 K-100-VA

SONY SOMIC 68K VSP2 CAMERA/VIDEO CONTROLLER

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KEYENCE BL-185 BARCODE READER and BL-U2 POWER SUPPLY

MURR ELEKTRONIK 24V Power Supply MCS5-115-230/24 5A

Intel Core 2 Duo Mobile T9400 2.53Ghz/6MB/106?6

Teli CS3730DC+1X65 lens+V-27R+Camera Holder

Watec WAT-505EX VISION CAMERA

Intel Core 2 Duo Mobile T7500 2.20Ghz/4MB/800

BOECKELER 1398 DIGITAL MICTROMETER POSITIONER HEAD

Agilent E2078-62101 CONN EXT HPIB GPIB Adapter

PowerCore CPCI-3750 Single Board CompactPCI?Computer

Symbol P370 P470 Cordless Scanner PS/2 cable P 370

Symbol P370 P470 Cordless USB Barcode Scanner Kit

MITUTOYO AT112 Linear Scales AT112-120 AT112-50

COGNEX IN-SIGHT 3400 ISS-3400-0 REV G with Full cable

Quickpanel Pro-Face GP370-LG21-24VP Touchdisplay

CISCO 10G BASE SR XENPAK TRANSCEIVER Module 10GB-SR

Opto 22 Classic Mistic G4LC32SXA Controller Processor

ZHONE MALC-G SHDSL-24

BK3110 KL1104 KL2134 DEVICENET BUS TERMINAL

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NEW HP 75000 Series C VT 1563A 800kSa/a 2 Ch Digitizers

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MITUTOYO LGB-110S LINEAR GAGE 542-401

MOTOROLA MCP750 VME Processor Module

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FORCE POWERCORE CPCI-690 CPCI 690 COMPACT PCI

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