描述

2)PLC的接線包括輸入接線和輸出接線。輸入接線的長(zhǎng)度不宜過(guò)長(zhǎng)，一般不大于30m；在線路距離較長(zhǎng)時(shí)，可采用中間繼電器進(jìn)行信號(hào)的轉(zhuǎn)換。輸入接線的COM端與輸出接線的COM端不能接在一起。輸入接線與輸出接線的電纜應(yīng)分開(kāi)設(shè)置。必要時(shí)，可在現(xiàn)場(chǎng)分別設(shè)置接線箱。集成電路或晶體管設(shè)備的輸入信號(hào)和輸出信號(hào)的接線必須采用屏蔽電纜；屏蔽層的接地端應(yīng)為一點(diǎn)接地，接地點(diǎn)宜在控制器側(cè)。

1.4冗余設(shè)計(jì)和降級(jí)操作設(shè)計(jì)

1)對(duì)可靠性要求較高的應(yīng)用場(chǎng)合，冗余設(shè)計(jì)和降級(jí)操作是必要的。冗余設(shè)計(jì)可采用熱后備或冷后備方式。熱后備方式操作時(shí)，冗余的后備系統(tǒng)也同時(shí)運(yùn)行，兩者輸出的結(jié)果一致時(shí)，表示系統(tǒng)是正常運(yùn)行的；一旦結(jié)果不一致，則發(fā)出警報(bào)信號(hào)，同時(shí)，根據(jù)自診斷的結(jié)果，切換到正常的系統(tǒng)去。冷后備方式操作時(shí)，冷后備系統(tǒng)不運(yùn)行，它在自診斷檢測(cè)出運(yùn)行系統(tǒng)故障后才切入后備系統(tǒng)。對(duì)PLC來(lái)說(shuō)，冗余系統(tǒng)的范圍主要是CPU、存儲(chǔ)單元、電源系統(tǒng)和通信系統(tǒng)，只有在可靠性要求很高時(shí)，才會(huì)包括輸入輸出單元的冗余等。

2)降級(jí)操作是指在設(shè)計(jì)時(shí)，將手動(dòng)操作包括在內(nèi)的設(shè)計(jì)。例如，緊急停車的設(shè)計(jì)，關(guān)鍵設(shè)備的開(kāi)停和再啟動(dòng)功能的設(shè)計(jì)等。這樣，一旦發(fā)生故障，可采用降級(jí)的操作，即對(duì)部分或全部設(shè)備進(jìn)行手動(dòng)的開(kāi)停操作，以避免設(shè)備的損壞或?qū)θ藛T的傷害。此外，在設(shè)計(jì)中也可考慮從全自動(dòng)到半自動(dòng)、直至手動(dòng)的操作等。

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，?？怂共_、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(lè)，ACSO，力士樂(lè)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。

OMRON G3PA-210B SOLID STATE RELAY

Lumonics Laser Interface SDT/EU Board PWB 2016047 REV A

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

SUPER VEXTA UDK5128N 5-PHASE DRIVER

SunX DPX-410-IN Digital Pressure sensor

Sorensen DCS40-25E DC Power Supply 0-40V 0-25A

BERKELEY BXi 4 AXIS SERVO CONTROLLER BXi4/2-01-B

COGNEX VISION SYTEM IN-SIGHT-3400 Processor

ARCOM CONTROL PCIB40 40-Ch Digital I/O,Counter Board

Teknic SST-3000-829 Servo Drive M-5075-829 SERVO Motor

OMRON E5CS-Q1KJ TEMPERATURE CONTROLLER

WATLOW ANAFAZE CLS216 CONTROLLER

SunX DP2-42N Digital pressure Sensor

KEYENCE LX2-V10W PHOTOELECTRIC AMPLIFIER THRUBEAM LASER

OMRON H5F-KB Digital Daily 24hr Time Switch control

Omron Temerature Controller E5C3 WR20K E5C3-WR20K

FREE QUAD Ethernet Module p/n 110789

Watlow 989A-25CE-NERG Digital Temperature Controller

Lot of 2 Agilent 10467-68701 Microprobe set

CyberOptics PWA 5120218 Rev B Board

Agilent W2641A DisplayPort Test Point Access Adapter

Agilent U2122A 32I USB Digital I/O

CyberOptics PWA 5120089 Rev F Board

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

Omron Temperature Controller E5CN-R2MT-500 AC100-240V

MITUTOYO 10X/24 WIDEFIELD FOCUSING EYEPIECES 24mm

National Instruments NI SC-2062 8-Channel Relay Board

Lot of 2 MATSUSHITA NAIS FPO-C14RS PLC+FPO-E8RS

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

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

Panasonic AC Servo Motor 1.0KW MSM102Q1C

FLOWLINE LR79326 ISOLATION RELAY LEVEL CONTROLLER

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

Dell UF804 E1705 9400 M90 NVIDIA GeForce GO 7800″NEW”

Watec WAT-902B High Resolution CCD Camera

Omron S8VS-24024 10 Amp 24 VDC Power Supply

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

FUJI TEAC TD-320A DIGITAL INDICATOR CONTROLLER

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

AGILENT N2269A DAC 16-BIT DIG I/O MULTIFUNTION MODULE

Lot of 2 HP 10705A INTERFEROMETER 10704A RETROREFLECTOR

BALDOR ASR SERIES BTS10-5/10-24-R?L-708 SERVO DRIVE

MITUTOYO LGB-110S LINEAR GAGE 542-401

MOTOROLA MCP750 VME Processor Module

SBS Technologies CP 6212 Universal Serial I/O

FORCE POWERCORE CPCI-690 CPCI 690 COMPACT PCI

Whedco DSP Motion Control IMJ-313E-X-D MTR-3N31 Motor

Galil 3-AXIS Motion Controller DMC-1030 DMC1030

FORCE POWERCORE CPCI-680 COMPACTPCI

COMPAQ 70-40453-01 U320 SCSI Bus I/O Controller

Dell 5U104 ATI VGA 64MB for Inspiron 5100 5150

SIEMENS 228246 card 210400 rev-f with 208000 rev-g

PEPPERL&FUCHS KFD2-SOT-EX2 Isolated Switch Amp qty=2

OMRON SYSMAC C60P Programmable Controller C60P-CDR-AE