描述
根据继电器电路图设计PLC的外部接线图和梯形图时应注意以下问题。
●应遵守梯形图语言中的语法规定。由于工作原理不同，梯形图不能照搬继电器电路中的某些处理方法。例如在继电器电路中，触点可以放在线圈的两侧，但是在梯形图中，线圈必须放在电路的最右边。
●适当的分离继电器电路图中的某些电路。设计继电器电路图时的一个基本原则是尽量减少图中使用的触点的个数，因为这意味着成本的节约，但是这往往会使某些线圈的控制电路交织在一起。在设计梯形图时首要的问题是设计的思路要清楚，设计出的梯形图容易阅读和理解，并不是告别在意是否多用几个触点，因为这不会增加硬件的成本，只是在输入程序时需要多花一点时间。
●尽量减少PLC的输入和输出点。PLC的价格与I/O点数有关，因此输入、输出信号的点数是降低硬件费用的主要措施。在PLC的外部输入电路中，各输入端可以接常开点或是常闭点，也可以接触点组成的串并联电路。PLC不能识别外部电路的结构和触点类型，只能识别外部电路的通断。
●时间继电器的处理。时间继电器除了有延时动作的触点外，还有在线圈通电瞬间接通的瞬动触点。在梯形图中，可以在定时器的线圈两端并联储器位的线圈，它的触点相当于定时器的瞬动触点。
●设置中间单元。在梯形图中，若多个线圈都受某一触点串并联电路的控制。为了简化电路，在梯形图中可以设置中间单元，即用该电路来控制某存储位，在各线圈的控制电路中使用其常开触点。这种中间元件类似于继电器电路中的中间继电器。
●设立外部互锁电路。控制异步电动机正以转的交流接触器如果同时动作，将会造成三相电源短路。为了防止出现这样的事故，应在PLC外部设置硬件互锁电路。
●外部负载的额定电压。PLC双向晶闸管输出模块一般只能驱动额定电压AC 220V的负载，如果系统原来的交流接触器的线圈电压为380V，应换成220V的线圈，或是设置外部中间继电器。
产品承诺：
保 证 全新原装进口,
保 证 安全准时发货，
保 证售后服务质量，
优势价格，大量现货。
主营DCS系统配件
机器人系统配件
大型伺服系统配件
品牌：ABB ,AB ,GE,FOXBORO,本特利，英维思，伍德沃德，西屋，瑞恩，施耐德，西门子，摩托罗拉，安川。力士乐。ACSO，横河等进口品牌。 专业销售进口DCS PLC系统备件模块
Triconex Siemens Yaskawa ABB GE Ovation AB Foxboro Motorola Schneider XYCOM KUKA 专业销售进口DCS PLC系统备件模块 15天包退换 一年质保 大量现货 国内实力库存商家
NEW Invensys Foxboro D0135ND Electric Level Sensor
GIDDINGS & LEWIS PIC900 BOARD 501-04803-01 502-03833
honeywell RM7890 D 1004 BURNER CONTROL S7800 A 1001 SET
ENDRESS & HAUSER FTI1947 FLOW METER MAGNETIC VARIOMAG
ALLEN-BRADLEY 1394C AC SERVO CONTROLLER 3KW AXIS module
SEW-EURODRIVE MFI21A/MM05C-503-16/Z18A MOVIMOT DRIVE
INGERSOLL-RAND DC MOTOR CONTROLLER SYSTEM 93969889
PARKER D1VW2CNYCFR 456 HYDRAULIC VALVE 4000PSI
UFM GDN-1-5-G-N-O UNIVERSAL FLOW MONITOR B-H NO SPARE
UFM GDN-1-5-G-S-O UNIVERSAL FLOW MONITOR B-H NO 1
Asco TriPoint SC11D Pressure and Temperature control
HONEYWELL BURNER CONTROL RM7896 D 1027 RM7896D1027
MITSUBISHI MELSEC A J65FBTA2-16T-S1 AJ65FBTA2-16T-S1 CC
Fairchild 24XFS-10840002 M/P Converter EB-1828
MAHR ZENTIMESS 0-1″ MARAMETER GAGE 0-25 .0005″ D.B.P
FLEX-KLEEN T16063 SMART TIMER MODULE
1 1/4″ CASH VALVE UNITED BRASS WORK PRESSURE REGULATOR
2″ BURLING BD2.0-4BB6130 pressure reducing Valve 700wog
Parker Schrader BELLOWS Pneumatic M05825245 MAN VALVE
Parker Schrader BELLOWS Pneumatic M08541888 3 way valve
5HP dayton INDUSTRIAL MOTOR 4 air compressor 3 phase
EGS SOLA/HEVI-DUTY S2K650 INDUSTRIAL UPS
cissell single puff iron hot steam dry cleaning 1 head
cat pump MODEL NO. 10-5 PRESSURE TRANSFER NTN 620GLU
VERSA-MATIC E6KP5B550 AIR OPERATED DIAPHRAGM PUMP
NDC 16097-06A FSA45 II SERVO AMPLIFIER MOBICON
SEW-EURODRIVE MFI21A/MM03Cz18AO/BW/AFO MOVIMOT DRIVE
NEW IT DELTA PTE080 3 PHASE SURGE PROTECTOR PTE 080
SCIEMETRIC 251B REV.1 INTERFACE/ANALOG MULTIPLEXER
MAXIMATOR MPLV 4 AIR DRIVEN AIR AMPLIFIER 1:4 MAXPRO
AMETEK GEMCO 2006-404L120A ROTARY LIMIT SWITCH SENSOR
1 1/2″ cash acme valve B-62 HY07.12 pressure regulator
RACINE BOSCH VALVE BLOCK FH9-LEBH-T08 1″NPT 4 PORTS
INDUMATIK Type KTC24T Inductive Level Probe
Farrand Controls 217500-1DO CVU Board NEW
Inventron 9650-0015 Controller Module w/ 3 Relays
ALLEN-BRADLEY SLC-150 1745-LP156 PLC PROCESSER UNIT
PINES-TYPE 1 1/4″ 1.250 TUBE BENDER RADIUS DIE 1.5 CLR
AYDIN CONTROLS 460-5469-509-Y PCB CIRCUIT BOARD VID-104
AYDIN CONTROLS TVD293 460-5140-501-P MFR33214 BOARD
ASG P2542 ASSEMBLY QUALIFIER AQGFR-QE4
AYDIN CONTROLS PRO 1204 400-5595 BOARD MFR 33214
HONEYWELL 8414 MFR 33214 900-5592E 460-5592-501-J BOARD
MODERN MACHINE MD 502 RESISTANCE WELD CONTROLLER mmd
INGERSOLL-RAND 93888832 N+1 MODULE ingersoll rand
OMRON H8PR-24 ROTARY POSITIONER H8PR
REXROTH INDRAMAT RMG12.2-NN INTERBUS GATEWAY MODULE
Honeywell Burner Control RM7838 C 1004 EXTENSION CABLE
PANDUIT 640K CPU BOARD 100-096-053 USON 4000 406B3X02
SCIEMETRIC 240 REV.1 COUNTER/TIMER MODULE 240 REV 1 CPU
ATLAS COPCO ASSEMBLY 9810-0740-61 SPINDLE MOTOR CABLE
RENISHAW PROBE ADAPTER PH6 Q51078
PARKER P5T-J040RGSN100 PNEUMATIC ACTUATOR VALVE
BOSCH REXROTH R900328798 HYDRAULIC VALVE Z2S16-A1-51
vickers PRESSURE reducing valve DGX 06 1BL 60 626458
SANDVIK COROMANT RA260 3-100M-10 FACE MILL CUTTER
BEIJER CIMREX 10 LCD HMI
YASKAWA USADED-22YRW11 AC SERVO MOTOR ELECTRIC W2200
THREAD-CRAFT M3550 BALL SCREW ASSEMBLY 97218
INGERSOLL RAND 93963361 N+1 MODULE USED MICRO TAS PLUS
new Emerson Industrial Control ES2600RG equipment 1 ph
MAXTEC OM25-AE MAXO 2 OXYGEN GAS ANALYZER MAXO2
MAXTEC MAXO 2 CERAMATEC OXIGEN ANALYZER MODEL OM-25AE
INDRAMAT RM O-01 PLC OUTPUT MODULE RM0-01 RMO-01
VORNE 2015S-422/485-24-CGX ALPHANUMERIC DISPLAY PANEL
SEW EURODRIVE MF121A/MM05CZ18AO/BW/AFO MOVIMOT DRIVE
YOUNG RADIATOR F-301-HY-4P HEAT EXCHANGER F301HY4P
VOGEL LC3000-E+471 LUBE SYSTEM CONTROLLER PLC IGZ36-20
4 way ajax buck valve Parker Schrader PILOT 315079000
BOONTON 4200 RADIO FREQUENCY RF MICROWATTMETER 01-03
4 way Schrader BELLOWS MULTI-PORPOSE VALVE 31507-9000
GE magnetic motor starter nema 3, 30hp, 50HP CR106E0
SEW-EURODRIVE TYPE (K46)LP56 ADAPTER,1:1 RATIO K46 LP56
STANLEY A40MRRF2-3 PNEUMATIC NUTRUNNER AIR TOOLS
honeywell RM7890 B 1014 BURNER CONTROL S7800 A 1001 SET
Rosemount Analytical Temperature Control 0054C MODEL 54
SEW EURODRIVE FELDVERTEILER MFI21A MOVIMOT INVERTER
LEEDS & NORTHRUP instruments CONTROLLER general signal
56 3/4″ FIBERGLASS PIPE INSULATION FOR HOT STEAM
JOHN DEERE SELECTIVE CONTROL VALVE Bucher AL174925 HR4
40 1 1/4″ FIBERGLASS PIPE INSULATION FOR HOT STEAM
STORDY FDA 5011-D HVAC FLAME CONTROLLER FDA5011
KAWASAKI MF6525 1 HY PC CONTROL BOARD 1HY-21 1HY-31
MURR ELEKTRONIX 85071 SWITCH MODE POWER SUPPLY MCS10
INGERSOLL-RAND ELECTRONIC NUT RUNNER SET EC24N EL1007B
KEB 96490931/177690 LCD DISPLAY TERMINAL ANTRIEBSTECHNI
KULICKE & SOFFA 00846-1004 FIBOR OPTIC LIGHT SOURCE
STI MINISAFE MS4300B-2 SERIES Light Curtain Controller
PACIFIC SCIENTIFIC PD2403DI-001-E 2400 SERVO DRIVE
MARPOSS GAUGE HEAD GRINDER SENSOR CONNECTER 6″ X 6-1/4″
SMC IISA2NPL-5D-X110 AIRCATCH SENSOR UNIT X110
85-1432-01 Tow Bar Bracket for Saturn Vue TOWBAR NEW
2 1/2″ consolidated dresser safety relief valve
PARKER Schrader Bellows 31508-9000 MULTI-PURPOSE VALVE
MKS 270C-11023 SIGNAL CONDITIONER display type 270
Leeds & Northrup Electromax III Auto Tune Controller
MFM NM34X-1.0-2781 SERVO MOTOR
ABB 6638514A1 GENERAL CONTROL KEYBOARD
IBM 8286113 SYSTEM BOARD PCB
Nakanishi Reducer ARG-02 HIGH SPEED SPINDLE BH101590
FSI 921DA1PLY/EP169 TEMPERATURE CONTROLLER MEGOHM-CM
PARKER L7952821153 PNEUMATIC 3-WAY SOLENOID VALVE 120V
ISSC 300-MXA Arithmetic Processor
MITTELSTELLUNG FSG DREHWINKEL WDG-1025-134 ENCODER
CASHCO 1-1/2″NPT CI/ LOW PRESSURE REGUALTOR valve
ALLEN-BRADLEY BULLETIN 808 ZERO SPEED SWITCH 808-C1 D
IAI LINEAR POSITIONER CONTROL IA CONTROLLER N 60W
IAI IAT-SEL2 MULTI-SERVO SEL CONTROLLER INTEL. ACTUATOR
sanyodenki sanyo denki PV BL SUPER SERVO AMPLIFIER PV1A
Parker Schrader BELLOWS Pneumatic 4 WAY Valve M09544650
Zexel 105210-5201 Hydraulic Valve 1/2″ Connection BOSCH
1″ Asco RED-HAT AUTOMATIC SWITCH Valve WPX83521313718
STANLEY A-4091 ELECTRIC NUTDRIVER E30LSRA3HXG-22
Seco-Larm E9622-4B25 Enforcer Curtain/Barrier Sensor
ESCORT MEMORY HS550A WIDE-FIELD READ/WRITE ANTENNA SYS
FESTO DGO-32-400-PPV-A-B PNEUMATIC LINEAR ACTUATOR
ISI VMS-2110-24 SMART VACUUM PUMP MANAGEMENT SYSTEM
PHOENIX CONTACT IBS ISA RI/I-T SLAVE BOARD 9372755_02
NUM SERVOMAC CIRCUIT BOARD 2UACG14B CT386A RLE3
Braden 4404801 Industrial 8″ X 6.50″ Hydraulic Motor
Foxboro N7301AY Periphearal Switch Module
Foxboro D3001YQ Control Circuit Board 6″ x 8.5″
Foxboro D3001YS Control Circuit Board 6″ x 8.5″
NUM ANALOG.AXIS 263900000 AXIS PORT CONNECTION MODULE
NUMATICS SH05603LB1XCS4 LINEAR ACTUATOR PNEUMATIC valve
Foxboro N7301 Line Printer Switch Module NEW
FESTO 160-253 PNEUMATIC AIR VALVE MODULE BEHR 12159
Badger Meter Research Control Valve 1003GCN36SVCSAEP36
CAMBRIDGE APPLIED SYSTEMS VP-1000 VISCOSITY MONITOR
Autotech Controls SAC-RL500-010 Hollow Shaft Resolver
VICKERS XG2V 6BW 10 HYDRAULIC PRESSURE REDUCED VALVE
LDE BOYAR SCHULTZ COLLECT HEAD ASSMBLY 0113194 J114346
GE MAGNETIC MOTOR STARTER NEMA 3 3 POLE 30HP CR205
MELEC MD-5501 PM DRIVER, 100VAC
STI LCM-1 SERIES SCIENTIFIC TECHNOLOGIES SAFETY CURTAIN
HONEYWELL TJF 060-H792-01TJG SENSOTEC TRANSDUCER
VIDEO-OPTICS V1518 CCU 939-0510 XENTEX INC 6417
ABB 22/06-69 ELECTRO-PNEUMATIC I/P CONVERTER VP AUTO
56 1/2″ FIBERGLASS PIPE INSULATION 3″ total Diameter
VEXTA BLD60A-MK BRUSHLESS DC MOTOR DRIVER
ATLAS COPCO 9810074061 NUTRUNNER SPINDLE CABLE AMTEC
TREX-ONICS 3102E74715 NUTRUNNER CABLE TPC WIRE #WW74715
NEW SANYO SVNM-MCA SERVO DRIVE MULTI CONTROLLER
HONEYWELL BURNER CONTROL RM7840 L 1018 RM7840L1018
MARPOSS A32 ELECTRONIC PROBE 340861600 6qp1316
Foxboro D3001YR Control Circuit Board 6″ x 8.5″ NEW
CCS Dual-Snap Temp Switch 646TE3 EXPLOSION PROOF SWITCH
REXROTH PNEUMATIK 546 017 002 0 FIBER OPTIC MODULE
RENISHAW E74046 P14 PROBE INTERFACE P 14 PI4
PEPPERL-FUCHS VAN-115/230AC-K8 POWER SUPPLY ASI PMR-2
HP 10780B Receiver Housing 2728A02567 Hewlett Packard
Honeywell Burner Control RM7838 B 1013 KEYBOARD DISPLAY
FANUC A06B-0345-B231 AC SERVO MOTOR 5F/3000
QUICKPANEL QPI-ABR-201 AB REMOTE I/O MODULE
MELSEC MITUBISHI FX2-48MT PLC TRANSISTOR UNIT
SONY VOLPI CH-8952/XC-77 CCD CAMERA MODULE XC-77 91D
TENSITRON TR-1000HC TENSION GAUGE,WIRE TENSION METER
EDWARDS DATAMETRICS 1501B VACUUM CONTROLLER 107593
TOYODA MC1K-U030V SERVO AMPLIFIER MOTION CONTROLLER
AB 1785-KE DH+/RS232 Communications Interface Module
REES 04944-200 CABLE OPERATED E-STOP SWITCH CBL-OPER
FESTO DIDACTIC FPC 101EA PLC TN014581
FANUC A16B-2200-085 AXIS CONTROL PCB BOARD
A BROWN & SHARPE GAGE TALKER III GT3-2300 GAGETALKER
honeywell burner control R7847 B 1023 DYNAMIC AMPLIFIER
HONEYWELL BURNER CONTROL RM7838 C 1004 rm7838c1004
ANN ARBOR WEBLINK 12F 12″ TOUCH SCREEN PANEL COMPUTER
ALLOY PRODUCTS 5 GALLON PRESSURE TANK 140-PSI T316
ITT DIA-FLO Diaphragm engineered Valve CF3M 303 1821 2″
WEIGH-TRONIX WBP-.250K III LOAD CELL 250#
LEBOW 7535 TRANSDUCER DIGITAL INDICATOR
CASH ACME FR-10 1 1/4″ BACK PRESSURE VALVE,
GE FANUC 44A719310-G02 Board FAB 44A719249-00R02/2
OMEGA 871A DIGITAL THERMOMETER K TC NICR-NIAI SENSOR
Square D elecrical controls nema size 2, 15hp, 25hp
ALPHA LPB 090-M01-3-111-000 SERVO SPEED REDUCER 3:1
SCHNEIDER ELECTRIC TSX EF ACC99 FIPIO TAP JUNCTION BOX
AMPROBE LRS-7R-T DATA ACCESSORY RECORDER PROBE QC17829
FOXBORO 75TUA PTEA-V ST.A TOTALIZER ENCLOSURE PANEL
NEW HONEYWELL S7800 A 1001 KEYBOARD DISPLAY MODULE
40 1″ FIBERGLASS PIPE INSULATION FOR HOT STEAM
29 1 1/2″ FIBERGLASS PIPE INSULATION 4 HOT LIVE STEAM
CHROMALOX 3101 TEMPERATURE CONTROLLER 3101-11000
1″ CASH VALVE, CASH-VALVE FOR LIVE STEAM 200 W.S.P
GARDNER-DENVER 2K1A 926875 NUTRUNNER SPINDLE TRANSDUCE
HONEYWELL S7800A 1001 KEYBOARD DISPLAY module english
SOMMER AUTOMATIC GP 240-B PNEUMATIC GRIPPER JD/68604
PERCEPTRON 916-4128 DIGITAL CONTOUR SENSOR TRICAM
OK ELECTRONICS DIVISION MODEL 510 LCD FREQUENCY METER
EGS CVS SOLA 23-13-030-2 SINE WAVE CONDITIONER REXEL
PARKER H1E13BGA23B PNEUMATIC SOLENOID VALVE
1″ ARMSTRONG VALVE, LIVE STEAM PRESSURE REGULATOR GD-45
asco 1 1/2″ 2way angle piston air control valve 8290A02
HONEYWELL GENERATOR 460-5518-501-C AYDIN CONTROLS
new CHINO GB102S-703 TEMPERATURE CONTROLLER GB99YY014
ELETTROMECCANICA 4219U2160 MARINE ELECTRIC PUMP
STI MINISAFE-B MS4312BX SAFETY CURTAIN 4268-70120 9708
1SET STI MINISAFE-B MS4316B SAFETY CURTAIN TRANSMITTER
OMEGA FMA-5606 GAS FLOW METER RANGE 0-500
OMEGA FMA-5603 GAS FLOW METER RANGE 0-50 FMA5603
OMEGA FMA-5605 GAS FLOW METER RANGE 0-200 FMA5605
2 1/2″ Hy-Grade Check Valve 101-2.5G-1AFI IT6660 150RF
2″ Powers Flowrite REGULATING ACTUATED Valve VEE 1E4 RA
1/2″ Burkert Air Actuated angle piston valve 49Z8 2509
Varian Electrical Raceway for Cable Tester
Foxboro E94-QXXL stcTemperature Transmitter PR-239
FLOTECT Flow Switch for Hazardous Locations MODEL V42U
POWERMAX II 1.8 STEP MOTOR P22NRXB-LNN-NS-00 PACIFIC SC
PLC模块，可编程控制器，CPU模块，IO模块，AI模块，通讯模块。AB/施耐德/ABB/GE/本特利/西屋/英维斯/霍尼韦尔/黑马/FU克斯波罗
15天包退换 一年质保 大量现货 国内实力库存商家
18150087953 点击拨打电话联系我们