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在生产机械的自动控制领域，PLC顺序控制系统的应用量大面广。然而，工艺不同的生产机械要求设计不同的控制系统梯形图。目前，不少电气设计人员仍然采用经验设计法来设计PLC顺序控制系统，不仅设计效率低，容易出差错，而且设计阶段难以发现错误，需要多次调试、修改才符合设计要。本文提出的4种简易设计方法，能快速地一次设计成功PLC顺序控制系统。
顺序控制系统的特点及设计思路
1．特点顺序控制系统是指按照预定的受控执行机构动作顺序及相应的转步条件，一步一步进行的自动控制系统。其受控设备通常是动作顺序不变或相对固定的生产机械。这种控制系统的转步主令信号大多数是行程开关（包括有触点或无触点行程开关、光电开关、干簧管开关、霍尔元件开关等位置检测开关），有时也采用压力继电器、时间继电器之类的信号转换元件作为某些步的转步主令信号。
为了使顺序控制系统工作可靠，通常采用步进式顺序控制电路结构。所谓步进式顺序控制，是指控制系统的任一程序步（以下简称步）的得电以步的得电并且本步的转步主令信号已发出为条件。对生产机械而言，受控设备任一步的机械动作是否执行，取决于控制系统步是否已有输出信号及其受控机械动作是否已完成。若步的动作未完成，则后一步的动作无法执行。这种控制系统的互锁严密，即便转步主令信号元件失灵或出现误操作，亦不会导致动作顺序错乱。
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WESTINGHOUSE 1A 1B Type MC Breaker Auxiliary Switch 1371D72G03

CUTLER HAMMER WESTINGHOUSE FDB Breaker 100A 3P FDB3100

CUTLER HAMMER SNT4RP03K 9-24 VAC VDC L and M Frame Shunt Trip 1493D40G12

CUTLER HAMMER CN15BN3EB

WESTINGHOUSE Type HFB Circuit HFB3050L

EATON CUTLER HAMMER FD3050

EATON CUTLER HAMMER FD FD3020 BP10

EATON CUTLER HAMMER MMX12AA2D4N0 0 208-240V .5 HP MMX M MAX

EATON CUTLER HAMMER A12NES1250T2 N Frame 6644C74G21

EATON CUTLER HAMMER HMCP Motor Circuit HMCP015E0C

EATON CUTLER HAMMER Type HFD HFD2040

EATON CUTLER HAMMER Type GHQ GHQRSP2020

Eaton Cutler Hammer Type HMCPE HMCPE030H1C

EATON KLOCKNER MOELLER XTOB070GC1

Eaton Cutler Hammer HMCPE050K2C

EATON CUTLER HAMMER EDB3110

Westinghouse MCP0358CR

CUTLER HAMMER WESTINGHOUSE HFD Breaker 25 AMP 3 Pole HFD3025

CUTLER HAMMER Size 1 Starter 110/120V 27 Amp AN16DNY1AC

CUTLER HAMMER M + L Frame Shunt Trip 12-24 VDC 12-14 VAC 83E8717

CUTLER HAMMER FD3100L

EATON CUTLER HAMMER WESTINGHOUSE AA13AB Sz.1 A200

WESTINGHOUSE CUTLER HAMMER A200 626B187G13

EATON CUTLER HAMMER CH250SUR 2P

EATON CUTLER HAMMER EHD2030

CUTLER HAMMER Type HFD HFD3100

CUTLER HAMMER Type HFD HFD3050

EATON CUTLER HAMMER EHD2010L EHD2010

EATON CUTLER HAMMER GD3060K

EATON CUTLER HAMMER JFDN100 F 1223C74G01

EATON CUTLER HAMMER EHD3050

CUTLER HAMMER C306KN3

Eaton Cutler Hammer Type GHB GHB3060

EATON CUTLER HAMMER MMX11AA1D7N0

EATON CUTLER HAMMER HFD HFD3025L H12

EATON CUTLER HAMMER ED2030

EATON CUTLER HAMMER GHB3040

EATON CUTLER HAMMER IO Relay EZ512 DC RCX

CUTLER HAMMER WESTINGHOUSE FDB3100

Cutler Hammer Westinghouse Rating Plug MCG800 600A 2608D29G03

WESTINGHOUSE KA JALB2A2B Auxiliary Switch 656D527G01

Cutler Hammer A1X4RTK

Westinghouse shunt trip for type J K KL 440V S-940094 60A93G0G11

Westinghouse 1A1B

WESTINGHOUSE CUTLER HAMMER FB3030 FB

Cutler Hammer B10BN0F

Eaton Cutler Hammer BJ2125










Cutler Hammer EATON 9560H1565-69 model 6-331-25

CUTLER HAMMER Current Sensitive Relay 76 Amp D60LT1

Eaton Cutler Hammer 30 Amp Disconnect Switch C360 NC

EATON CUTLER HAMMER EAC2420SP AC

CUTLER HAMMER WESTINGHOUSE 400LAP10 LA TRI PAC

CUTLER HAMMER WESTINGHOUSE A1L2RPK AL/LO Switch 600 VAC S# 1491D43G03

EATON CUTLER HAMMER Power Supply PSG480E

WESTINGHOUSE CUTLER HAMMER FB3015

CUTLER HAMMER Shunt Trip for Type KA & JA Breaker 120V 2605D15G05

EATON CUTLER HAMMER Rating Plug 4KES225T

EATON CUTLER HAMMER Photoelectric 50 Series 8ft. REFLEX Sensor 1450 BS2202

WESTINGHOUSE Circuit Breaker 15 Amps 3 Pole 480 VAC EHD3015

EATON CUTLER HAMMER Size 00 ECN05A1QAA

EATON CUTLER HAMMER HMIEC1612 I/O

CUTLER HAMMER 10250T 4337 Start 10250T4337

CUTLER HAMMER 20 Amp 2 Pole 240 V C30BN2B

CUTLER HAMMER WESTINGHOUSE FD FD3070

EATON CUTLER HAMMER FD Breaker 3 Pole 20 Amp FD3020

CUTLER HAMMER LST1RPK Low Energy 1490D88G03

WESTINGHOUSE Size 0 B100 Manual 2P B100S0B

CUTLER HAMMER 9 1688 1 230V DC Coil 9-1688-1

CUTLER HAMMER ED3150 3 Pole 150 Amp ED Breaker

CUTLER HAMMER WESTINGHOUSE UVH2RB21 J 1491D44G81

CUTLER HAMMER EHD3060L 3 Pole 60 Amp EHD

CUTLER HAMMER WESTINGHOUSE A200 Size 5 GCA Starter Coil 440 480 V 2050A14G15

EATON CUTLER HAMMER 1KES100T K Frame 100 Amp Rating Plug 6612C40G18

EATON CUTLER HAMMER EHD2100KS 2 Pole 100A

EATON CUTLER HAMMER EHD3100 BP10

EATON CUTLER HAMMER BJ2225

EATON CUTLER HAMMER 1KES125T 125 Amp K Frame Rating Plug 6612C40G16

EATON DURANT 6 Y 1 2 MFPM U 120 V Counter 32654 400

WESTINGHOUSE CUTLER HAMMER RP6D20A200 DS Rating Plug 2000 Amp 3D86734G27

CHALLENGER WESTINGHOUSE HMCP Motor CHMP003A0

CUTLER HAMMER EHD Circuit Breaker 60 AMP 2 Pole EHD2060L

WESTINGHOUSE HFD Circuit Breaker 3 Pole 70 Amp HFD3070

WESTINGHOUSE FDB Breaker 2 Pole 25 Amp FDB2025

WESTINGHOUSE KB JB Frame Breaker 125 V DC Shunt Trip 2609D42G24

CUTLER HAMMER 8MES400T 400 Amp L+M Frame 6603C02G40

Cutler Hammer 400: 0.1 K Frame L Frame 400 Amp 7801C40G03

WESTINGHOUSE GHB2090

WESTINGHOUSE A201SACB Size 00 A201KACB

EATON CUTLER HAMMER A2X1RPK 2A 2B Double F Frame Auxiliary Switch 1490D72G14

EATON DURANT 31746 400 Model 6 CS 1 RMF Electronic Counter 6-CS-1-RMF

Cutler Hammer Westinghouse A6LC450 LC 600 Adjustable 2608D89G09

WESTINGHOUSE ARB660A 10 Amp 300 V Type ARB Control Relay 120 V Coil 765A729G01

WESTINGHOUSE 800LAP12 Type K KL LA TRI PAC Current 504C920H03

CUTLER HAMMER IQDATA Relay Meter 9966D75G02










WESTINGHOUSE KB JB 24VDC UVR LH 2601D31G12

CUTLER HAMMER WESTINGHOUSE FDB Breaker 3 Pole 40 Amp FDB3040L

CUTLER HAMMER 16RES12T 1600 Amp R Frame Breaker 1200 A 6635C67G05

WESTINGHOUSE 1LC100 LC HLC 150 100 Amp Rating Plug 2603D88G03

EATON CUTLER HAMMER Freedom Series C400GK12A

EATON UPLINK ConnectUPS X Web SNMP X Hub Card 116750221 001

CUTLER HAMMER FD3100L 3 Pole 100 Amp

CUTLER HAMMER A2X3PK K Frame Double 250VDC 6642C15G02

CUTLER HAMMER Magnum DS 2-30 Position 2A10899G01

EATON CUTLER HAMMER FVNR MMC Manual XTSC2P5BBT

CUTLER HAMMER Type KD HKD DK KDB K 1482D11G04

CUTLER HAMMER F Frame FD HFD-DC 4 Pole 1480D13G07

CUTLER HAMMER AN16BN0AC 110/120V Size 0 AN16BN0

EATON CUTLER HAMMER Type FD FD2100

EATON CUTLER HAMMER HMCPE Motor HMCPE015E0C

CUTLER HAMMER Type GHB Circuit GHB3040

EATON CUTLER HAMMER FVNR Starter 1.6-2.4 Amp 110/120V XTAE007B10H2P4

CUTLER HAMMER Type BA BAB Shunt BAB3090HS

CUTLER HAMMER Type ED Blue Label ED2200