描述
PLC是专为工业控制而开发的装置,其主要使用者是工厂广大电气技术人员,为了适应他们的传统习惯和掌握能力,通常PLC不采用微机的编程语言,而常常采用面向控制过程、面向问题的“自然语言”编程。国际电工委员会(IEC)1994年5月公布的IEC1131-3(可编程控制器语言标准)详细地说明了句法、语义和下述5种编程语言:功能表图(sequentialfunctionchart)、梯形图(Ladderdiagram)、功能块图(Functionblackdiagram)、指令表(Instructionlist)、结构文本(structuredtext)。梯形图和功能块图为图形语言,指令表和结构文本为文字语言,功能表图是一种结构块控制流程图。
梯形图是使用得最多的图形编程语言,被称为PLC的第一编程语言。梯形图与电器控制系统的电路图很相似,具有直观易懂的优点,很容易被工厂电气人员掌握,特别适用于开关量逻辑控制。梯形图常被称为电路或程序,梯形图的设计称为编程。
梯形图编程中,用到以下四个基本概念:
1.软继电器
PLC梯形图中的某些编程元件沿用了继电器这一名称,如输入继电器、输出继电器、内部辅助继电器等,但是它们不是真实的物理继电器,而是一些存储单元(软继电器),每一软继电器与PLC存储器中映像寄存器的一个存储单元相对应。该存储单元如果为“1”状态,则表示梯形图中对应软继电器的线圈“通电”,其常开触点接通,常闭触点断开,称这种状态是该软继电器的“1”或“ON”状态。如果该存储单元为“0”状态,对应软继电器的线圈和触点的状态与上述的相反,称该软继电器为“0”或“OFF”状态。使用中也常将这些“软继电器”称为编程元件。
欧美品牌停产的,常用的“PLC”备品备件
我司产品应用于以下领域:
1,《发电厂DCS监控系统》
2,《智能平钢化炉系统制造》
3,《PLC可编程输送控制系统》
4,《DCS集散控制系统》
5,《智能型消防供水控制系统》
6,《化工厂药液恒流量计算机控制系统》
7,《电气控制系统》造纸,印染生产线,变电站综合自动化控制系列
本特利,英维思,伍德沃德,福克斯波罗、西屋、瑞恩、施耐德莫迪康、ABB、AB、西门子、摩托罗拉、GE发那科、安川、博世力士乐,ACSO,力士乐等各大品牌的DCS系统配件,机器人系统配件,大型伺服系统备件。
AD-8118A JOURNAL PRINTER USED SPARE
ADDA 12VDC Brushless Blower Fan AB5012MB-C03
Lot 33 TYCO1658629-1 SFP CAGE Connector 2X4 PRESS FIT
Alcatel SERV 3DB02155AA
Alcatel OC3C/STM1C IR I/O CARD Refurbished
Alcatel MD128W1 3DB02136AA
Alcatel SWL-B LHR R2.0 FEE License Certificate
Lot of 10 SANDVIK inserts 340.009 240 N134 R535 08B/864
LOGICODE MT-LC-D960C Communication Unit Cradle NEW
Lot of 10 lbs ALLFAST RIVET SOLID AF1049W1C6C6 Boeing
Alcatel 3AL97690AA LC-ESC board NEW
Vision Multiswitch V5-508 new
Fuji Electric DC-02121 DDC TR285698 Control Board NEW
Fuji Electric Pulse Amplifier TR284228 New
Fuji Electric Pulse Transmitter TR490533C TR284654A New
NOKIA D50e ATM LINK INTF CARD eSTM1LS E35478.01 New
IP05 IP ENGINE ipanema xx-256-CF512-2-?X-G4
GE Energy Power module 151X1225EK01PC0?3 230V TO 12V NEW
HoneyWell C7061F2001 Purple Peeper Flame Detector C7061
IRIS Model P522 P522AC Flame Monitor Signal Processor
HLOS CL-7000 Electrical Screwdriver&CLT-150 power NEW
lot 520 iKANOS Fusiv IKF68331-A1-PB1?-C chips$4/each
ABB 3BSE040360R41 Compact Control Builder CD license
CG171A-T003-05 Reflector Film UX188 etching mould USED
HoneyWell C7012A 1202 Purple Peeper UV Flame Detector
Mitsubishi Melsec FX1N-14MR-001 PLC Logic Controller
Yamatake azbil R4780B R4780B1003 Protector Relay NEW
Agilent Brass 5080-8750 5180-4121 5180-4160 8710-1709
Lot 13 pcs QLOGIC ISP2322 chips PN:2405448$12/pc New
LINCOLN 82050 Barrel Grease Pump NEW
keofitt M4 Valve Body type T 400001 New in Box
HP COMPAQ 416039-001 405963-001 NC6200 NC6300 KEYBOARD
SAMSUNG A-PRO Power Supply APP-1373V NEW
MACTek VIATOR Bluetooth Interface Model 010041 New
HITECH HMI PWS6500-S Touch Screen New Surplus
SIMATIC BOX PC 820 6ES7647-3DC00-0?DX0 USED
Cisco Unified Communications Manager CM6.1U4-K9-UPG=
WENDT Cutter Grinding DIA Blade L16A.000.048 NEW in box
Lot 520 JST Connectors S7B-PH-K(T)New in box S7B-PH-K
Turck BANNER IM35-11EX-HI/24?VDC Analog Data Transmitter
Turck BANNER IM35-22EX-HI/24?VDC Analog Data Transmitter
Star Diagnosis SDconnect DCDI D3 Multiplexer USED
Alcatel 3BA23197BA CPU6 Board 40G 128M New
Alcatel 3BA23241AA GPA2 Board New
DILM7-01 24VDC Contactor Moeller Electric NEW
MOELLER EMT6-KDB Thermistor overload relay
MKS Baratron 220DD Differential Capacitance Manometer
STI RELAY FGR22-24 44532-3010 FGR22 24VDC 2NO+2NC NEW
PACKETEER Fiber Bypass Switch FSW-MMF
PACKETEER SFP Transceivers GXVR-SX G10–1201-1001
ABB Motor M3AA200MLA 4/8 3GAA208207-BDC 220KG NEWinbox
ABB Motor M2AA180M 3GAA182111-BDA 118KG NEWinbox
TAMAGAWA TBL-I SERIES AC SERVO MOTOR TS4502N2000E100
IFM IG5842 IGA4008-CPKG/US?-100-DPA New
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IFM IM0011 IME2015BFBOA New
IFM E20421 FIBEROPTIK INFRA-SENSOR New
IFM E30060 WELDING ADAPT New
IFM IW5058 IW-3008-BPKG New
IFM IF9920 IFB2002-ARKG/0,?80M/US New
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Altivar IMC Drive controller HMI VX4A61101Y ATV61 160KW
Lot 125 Johnson Electric BI03007 13V washer pump Motors
Altistart 48 HMI module from ATS48C25Q
Altistart 48 controller board from ATS48C25Q
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OERLIKON TIBOR33 Submerged Arc Welding Wires 4.0mm 25kg
Octel 250 Power 014-1050-003 Power-One SP630 350W
MAN B&W PMI SYSTEM Pressure Analyzer for 6S50MC-C
BOSCH EV6 Fuel Injector 0280155794 for Peugeot 206
RAYTHEON Modulation and Monitoring PEC 808415/001/006
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Lot of 10 Novartis CSOM230B2305 Amendment#2 Kit B
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Wonderware InTouch Runtime 500 Tag FS2000/9.0 New
Lot 10 Novartis CSOM230B2305 Amendment#2 Kit D 2010-MAR
Wonderware SuiteVoyager 2.0 Client Access License
Lot 10 Novartis CSOM230B2305 Amendment#2 Kit I 2010-MAR
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