描述
应该注意的是虽然在梯形图中已经有了软继电器的互锁触点(X1与X0、Y1与Y0),但在I/O接线图的输出电路中还必须使用KM1、KM2的常闭触点进行硬件互锁。因为PLC软继电器互锁只相差一个扫描周期,而外部硬件接触器触点的断开时间往往大于一个扫描周期,来不及响应,且触点的断开时间一般较闭合时间长。例如Y0虽然断开,可能KM1的触点还未断开,在没有外部硬件互锁的情况下,KM2的触点可能接通,引起主电路短路,因此必须采用软硬件双重互锁。采用了双重互锁,同时也避免因接触器KM1或KM2的主触点熔焊引起电动机主电路短路。
欧美品牌停产的,常用的“PLC”备品备件
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DIGIBOARD DIGICHANNEL BOX DUAL IMAC+POWER SUPPLY
IMC NETWORKS IMCV-FIBERLINX TX/FX SM1310 56-14516
Vsecure Technologies NetProtect LG100 Enterprise
ECI TELECOM BROADGATE nNT-E ROUTER 4x E1 PORTS NEW
BLACK BOX LE2101A-BT-R2 SINGLE PORT TERMINAL SERVER
IMC NETWORKS IMEDIACHASSIS SNMP MODULE 50-39950
IMC NETWORKS MEDIA CHASSIS 1-AC 1 SLOT 50-13100
IMC NETWORKS IMCV-GIGA-FIBER TX/LX-SM1310-SC 56-14870
NORTEL 8691SF DS1404090 PASSPORT MODULE 8006 SWITCH
AVAYA 700397110 MM316 40 POE HDMM
ADVA Optical Channel Multiplexing AD-SWM-DUP-4-S-?ST/ST
DATA SWITCH 9045 9045-15LL2DST
MAGNETEK SLI-48-230 SLI INVERTER 48V SL48-230
MCDATA SPHEREON 4500 FABRIC SWITCH
Sun ST914602SSUN 146G 540-7152-01 146GB 10k 540-7152
MATSUSHITA LF-D311SC 4.7GB IDE DVD RAM DRIVE
MATSUSHITA LF-D211V IDE 4.7/9.4GB REWRITABLE DVD-RAM
Western Digital WDAL2540 540MB Laptop Hard Drive
HP OMNIBOOK XE3 13.3″LAPTOP LCD DISPLAY LG LP133X7
MEMORY FOR LAPTOP 512MB SYNC 133MHZ CL3
MS340-EA 1GB(4X256MB DIMMS)43-096-0010 DS20 MS340EA
Lot of 576 STMicroelectron?ics M29W800DB70N6 Flash 8mb
Lot of 480 AMD AM29LV800DB-90EI Flash Memory 8MB
Lot of 120 Motorola MC68EN360CEM25K Electronic Componen
LOT OF 4 SUN MEMORY 370-6208-01 1GX4 370 6208
Sun Netra T2000 System Fan Assembly P/N 371-2736
LOT OF 4 HYNIX PC2100R-25330 2GB DDR 266MHz CL2.5 ECC
MICRON 1GB SYNCH 100MHZ CL2 ECC MEMORY MODULE
DATACUBE MAX VIDEO 20 260-0599 VME BOARD 080-0599-03
Performance Technologies PT-SBS 915 Board
SBE VCOM-33 REV A4 9016-36
ZNYX ZX4500P COMPACT PCI Dual 1000sx Manage Switch
MOTOROLA MVME162-032 01-W3884B W/LAN PORTS ADD ON BORD
MOTOROLA COMPACT PCI CPV5370 BOARD 01-W3545F
MOTOROLA COMPACT PCI CPTM-04 BOARD 01-W3764F
TOKIO ELECTRON TEL TEB102-1 NASS MVME BOARD
BIORAD MICRO MEASURMENTS Y5304901 VME BOARD
COMPUTER RECOGNITION SYSTEMS VME BOARD 8815CX528
COMPUTER RECOGNITION SYSTEMS 8843CC413 EDGE DETECTOR
COMPUTER RECOGNITION SYSTEMS VME BOARD 8937-0000
COMPUTER RECOGNITION SYSTEMS LCS BOARD 1520-1000
COMPUTER RECOGNITION SYSTEMS VME BOARD 8805DP862
COMPUTER RECOGNITION SYSTEMS VIDIO BOARD 10779
BIORAD RATS INTERFACE VME BOARD Y5304803
BIORAD AIMS CD SERVO VME BOARD Y5301267
PME SIO-1 VME BOARD
COMPUTER RECOGNITION SYSTEMS VME OVERLAY 8946-0001
RASTER GRAPHICS INC.6000700-09A VME BOARD
TOKIO ELECTRON TEL TVB0008-1 VMIF VME BOARD
BALDOR ASR BTS10-7.5/15-24-RL-736 28102D 27431D-002
BALDOR ASR BTS10-2.5/8-24-RL-735 27981D 27426D-002
BALDOR ASR BTS10-1/2-24-RL-734 27930D 28101C-002
ADEPT TECH 030-IDE 10332-11150 VME BOARD WARRENTY
Applied Materials Digital I/O Board 0100-20003
MOTOROLA MVME 197LE MAINFRAME BOARD
MOTOROLA MVME MODULE 01-W3347F-43A 147-022
VMI VMIVME 7487A MAINFRAME BOARD
DESCHUTES CORPORATION SG100 670-0030-00 MAINFRAME BOARD
DESCHUTES CORPORATION OCTUPOLE DRIVER 670-0100-01
ASML/SVG DUAL CHANNEL AQUISITION VME BOARD 865-8010-005
ASML/SVG DUAL CHANNEL AQUISITION VME BOARD 865-8023-004
ACB VME BOARD D23123300
ASML/SVG PC Board P/N:865-8022-00?4
Motorola 01-W3632F-12A cPCI BOARD 01-W3632F
Motorola 01-W3658F-06B cPCI BOARD 01-W3658F W/0181F-02A
RADVISION asNT-10 MODULE W/WIN SERVER 2000
MOTOROLA MVME2302 01-W3345F MVME 2302 NEW
COMPACT PCI 100P172820 120P243641 BLADE NEW
Motorola CPN5365 01-W3658F-06J cPCI BOARD 01-W3632F
Siemens S42024-C3016-A1 MAINFRAME BOARD
MIZAR 7710 VIDEO Board 7710-00011-01 REV-W
MOTOROLA COMPACT PCI CPV5370 BOARD 01-W3545F NTAR02NV
MOTOROLA CPTM-04 01-W3764F 01B NORTEL NTAR02NX
MOTOROLA 01-W3739F NORTEL NTAR02JY
SBE VCOM-33 VME CONTROLLER MODULE
METACOMP VMEcomm20 VME MODULE