HVC80-30老默說，買它
PLC具有通信聯(lián)網(wǎng)的功能，它使PLC與PLC之間、PLC與上位計算機以及其他智能設備之間能夠交換信息，形成一個統(tǒng)一的整體，實現(xiàn)分散集中控制?，F(xiàn)在幾乎所有的PLC新產品都有通信聯(lián)網(wǎng)功能，它和計算機一樣具有RS-232接口，通過雙絞線、同軸電纜或光纜，可以在幾公里甚至幾十公里的范圍內交換信息。


PLC之間的通訊網(wǎng)絡是各廠家的，PLC與計算機之間的通訊，一些生產廠家采用工業(yè)標準總線，并向標準通訊協(xié)議靠攏，這將使不同機型的PLC之間、PLC與計算機之間可以方便地進行通訊與聯(lián)網(wǎng)。


了解了PLC的基本結構，我們在購買程控器時就有了一個基本配置的概念，做到既經(jīng)濟又合理，盡可能發(fā)揮PLC所提供的佳功能。


基本指令系統(tǒng)特點


PLC的編程語言與一般計算機語言相比，具有明顯的特點，它既不同于語言，也不同與一般的匯編語言，它既要滿足易于編寫，又要滿足易于調試的要求。目前，還沒有一種對各廠家產品都能兼容的編程語言。如三菱公司的產品有它自己的編程語言，OMRON公司的產品也有它自己的語言。但不管什么型號的PLC，其編程語言都具有以下特點：

  listing Globe C36CB-SR Chefmate Series Gas Charbroiler SST Radiant
          listing ITW Ramset Red Head T3SS T3 Single Shot Single Pin Gas-Powered Tool w/ T3cup
          listing Molex SST-PB3-CLX ControlLogix Profibus Module
          listing           Agilent HPLC part # G1313-87103,Capillart SST ,100mm L,0.12mm id
          listing           Agilent HPLC part # G1316-87300 Capillary SST 70mm L,0.17mm id
          listing PITCO CONTL BOX ASSY SST B2005301
          listing SEAL CENTERING RING ASSY NW100 W/VITON ORING SST ISO-100-CR-SV AMAT LOT OF 3
          listing SIMPSON SWAN SECURE 316 SS T8SND25 25LBS. 2-1/2" 8d SIDING NAILS
          listing SST AMAT DNP-CPCI-1 DeviceNetPRo to 2-Ch CompactPCI Interface Card / Warranty
          listing SST Woodhead ISA Interface card 5136-DNP
          listing ST9120B,U Honeywell Universal Electronic Fan Timers          
          listing Teknic SST-1500-ACX Servo Stepper Drive
          listing UNAXIS MDX-SST MDXSST BG578000-T/A BG578000TA
          listing Vector VEC050D,1500 Watt D/C To A/C MAXX SST Power Inverter 3000 Watt peak Great
          listing Wiley X SSTWI01 WX-Twisted SST Glasses Black Op Smoke Grey Len Matte Black Frame
          Lot of 8 Applied Materials (AMAT) 3300-50015 FTG TBG 1/2" T X 1/2" FNPT SST
          MCF 1 1/2" INDUSTRIAL BALL VALVE MODEL SST56HT (2 AILABLE)
          MCF 1" INDUSTRIAL BALL VALVE MODEL SST55HT
          MDC L800-CRSS 810013 VACUUM FITTING CENTERING RING NW200 ISO 200 VITON SST
          MERCOID DA-7038-153-5-SST TEMPERATURE SWITCH REMOTE BULB TEMPERATURE CONTROL
          MKS INSTRUMENTS 100763508 FLEXIBLE VACUUM BELLOW NW80 ISO 80 5.9" L SST
          NAMCO FO CBL-THD SENS HD-6FT-SST-SCANNER
          NESLAB CHILLER 006626 HEATER ELEMENT 3 PHASE 12.8kW 2.25"X12.5" SST 332-0109
          Nibco T-174-SS Gate Valve - 1 1/4" Threaded
          NOR-CAL NC ISO-160-CR-SV CENTERING RING SPACER RING VITON O-RING AL SST
          NOR-CAL NC ISO-250-CR-SV CENTERING RING SPACER RING VITON O-RING AL SST
          NOR-CAL NC ISO-320-CR-SV CENTERING RING SPACER RING VITON O-RING AL SST
          NOSHOK 25-300-SST-1500 PRESSURE GAUGE 25300SST1500
          NOSHOK PRESURE GUAGE 25.510.SST.5000 PSI 7/16-20
          OLD DYNAMICS RESEARCH DRC SST-11-E4-07C-C000 LINEAR ENCODER, 4"-STROKE CH
          OLD STOCK SOLON PRESSURE SWITCH 2PSW1SST2 0-100PSI 15A 125/250/480VAC
          OMEGADYNE PX319-1KG5V PRESSURE TRANSDUCER 0-1000 PSIG RANGE 0-5V OUTPUT SST
          OPW AMNITEC CIVACON AUTOLOK 733DL-10SF 733-DLF 1" SST QUICK COUPLER 1" SST
          PACIFIC/DRESSER PUMP IMPELLER 410 SST SP J49218 9"
          PARKER 8 PNQ-SS ULTRASEAL PLUG ASSY 316 SST
          PARKER STAINLESS S/S MALE QUICK CONNECT COUPLER SST-6M SST6M 3/4" MALE NPT
          Pass-Thru Heated Cabinet Sst Front True Refrigeration STG1HPT-1G-1S (Each)
          Pass-Thru Heated Cabinet Sst Front True Refrigeration STG2HPT-2G-2S (Each)
          PBM CONTROL BALL VALVE/ ACTUATOR PSR-1000-8D SPH-34-S2/H68D 1" THD 316L SST
          ProMinent Sigma Dosing Metering Pump S2BAHM16130SST00802000 S2BA 39.6g 232ps
          RICE LAKE 2000KG LOAD CELL 31251 01 SEB RLHTO-C3-2t 2mV/V 350OHM OIML-C3 SST
          Roll-In Refrigerator Sst Front & Sides True Refrigeration STA2RRI-2S (Each)
          Roll-In Refrigerator Sst Front & Sides True Refrigeration STR2RRI-2S (Each)
          Roll-Thru Refrigerator Sst Front True Refrigeration STG1RRT-1G-1S (Each)
          Roll-Thru Refrigerator Sst Front True Refrigeration STG1RRT-1S-1S (Each)
          Roll-Thru Refrigerator Sst Front True Refrigeration STG2RRT-2G-2S (Each)
          Roll-Thru Refrigerator Sst Front True Refrigeration STG2RRT-2S-2S (Each)
          Romac Industries SST III Stainless Steel Pipe Tapping Sleeve 12" x 6"
          ROSEMOUNT 2" SPACER KIT SST 08800-5711-0201
          SAUNDERS CRANE EC PISTON ACTUATOR STONEL REISM SST PM33
          Sealed SST Woodhead SST-ESR2-CLX-RLL Ethernet Modbus/Serial Modbus Interface
          SHARPE BALL VALVE 316 SST CF8M BUTT WELD 1/2" 1000 CWP
          SHARPE BALL VALVE 3pc FULL PORT CF8M 316 SST 1-1/4" BUTT WELD 1000 CWP
          SHARPE SERIES 13 BALL VALVE CF8M 316 SST 2-1/2" SOCKET WELD 1000 PSI DIR ACT
          SHARPE SERIES 39036 BALL VALVE CF8M 316 SST 2-1/2" SOCKET WELD 1000 PSI
          Shinano Kenshi Co SST40C1031 0.9DEG/STEP 11.2V0.3A STEPPER MOTOR Japan
          SHINANO KENSHI SST83D1C020 STEP MOTOR, NO 22Z03 2.8V, 2.8A BF
          SIEMENS 5136-DNS-200S SST DEVICENET COMMUNICATION MODULE
          SIEMENS 5136-DNS-200S SST DEVICENET COMMUNICATION MODULE ASSEMBLY D482401
          SST 5136 TIPC,5136-TI REMOTE I/O ISA PC CARD FOR SIEMENS 5136-TI-ISA ,BP
          SST 5136-DNP-PCI 5136DNPPCI PCI Interface Card for DeiceNet
          SST 60 PITCH ROLLER CHAIN IN 24" LENGTHS W/ CONNECTING LINKS BOX OF 30 =60'
          SST INTERFACE CARD FOR ALLEN BRADLEY NETWORKS P/N: 5136-SD-ISA (B127)
          SST Network Interface Card - 5136-SD
          SST RFID-181-EIP ETHERNE S C-C7TW6574 6GT2002-0JD20 MODULE 6GT2002-4JD00 BC
          SST RFID-181-EIP ETHERNE S C-C7TW6574 S C-BNUJ8049 MODULE 6GT2002-4JD00 BH
          SST Safety Systems GT810 Toxic CO Gas Sensor Transmitter 4-20 mA / Warranty
          SST SST-ASI-SLC SSTASISLC AS-Interface Scanner Module
          SST SST-PFB-SLC SLC-500 BACKPLANE COMMUNICATION MODULE FOR PROFIBUS D509371
          SST Woodhead SST-PFB-CLX PROFIBUS DP Remote I/O Scanner Module Allen Bradley
          sst-2000A speed switch transmitter SST2400A-1 DYNALCO CONTROLS
          STAINLESS SST TARBY ROTOR FOR STAINLESS STEEL PUMP 2FT L X 0.93"ID X 2" DIA
          Star SST-30 Bun Warmer
          Star SST-50 Bun Warmer
          Star SST-75 Bun Warmer
          Starter for John DeereLTR166 LT170 SST16 SST18 MOWER
          SWAGELOK 6LVDSBW4, HIGH PURITY SST DIAPHRAGM VALVE
          Thermo Scientifi Dionex Viper SST 0.13 x 550mm P/N 6040.2305
          Thermo Scientifi Dionex Viper SST Capillary HPLC UPLC Tubing 0.13 x 250 mm
          Thermo Scientifi Dionex Viper SST Capillary HPLC UPLC Tubing 0.13 x 350 mm
          Thomas & Betts T38SST Stainless Steel 1" Rigid Conduit body
          TREA INC SANITARY HOSE SST 3/8 WCSS PROCOMAC PR0609
          TRIUMPH T100SS T100R T100A T100S T100C FENDER MUDGUARD SET 1960s
          UNITED CONVEYOR 46006-8 SS T-BOLT SNAP LOCK CLAMP 1 1/4" W X 26-27" DIA FK
          VACUUM SANITARY FITTING FLANGE W/ 3/4" AND VCR SST
          VAT 14046-PE44 ISO200 (ISO-F) SST Pneumatic Gate Valve
          VAT 17244-UE14 8" CF SST Pneumatic Gate Valve