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特點(diǎn)順序控制系統(tǒng)是指按照預(yù)定的受控執(zhí)行機(jī)構(gòu)動(dòng)作順序及相應(yīng)的轉(zhuǎn)步條件，一步一步進(jìn)行的自動(dòng)控制系統(tǒng)。其受控設(shè)備通常是動(dòng)作順序不變或相對(duì)固定的生產(chǎn)機(jī)械。這種控制系統(tǒng)的轉(zhuǎn)步主令信號(hào)大多數(shù)是行程開(kāi)關(guān)（包括有觸點(diǎn)或無(wú)觸點(diǎn)行程開(kāi)關(guān)、光電開(kāi)關(guān)、干簧管開(kāi)關(guān)、霍爾元件開(kāi)關(guān)等位置檢測(cè)開(kāi)關(guān)），有時(shí)也采用壓力繼電器、時(shí)間繼電器之類(lèi)的信號(hào)轉(zhuǎn)換元件作為某些步的轉(zhuǎn)步主令信號(hào)。
為了使順序控制系統(tǒng)工作可靠，通常采用步進(jìn)式順序控制電路結(jié)構(gòu)。所謂步進(jìn)式順序控制，是指控制系統(tǒng)的任一程序步（以下簡(jiǎn)稱(chēng)步）的得電必須以前一步的得電并且本步的轉(zhuǎn)步主令信號(hào)已發(fā)出為條件。對(duì)生產(chǎn)機(jī)械而言，受控設(shè)備任一步的機(jī)械動(dòng)作是否執(zhí)行，取決于控制系統(tǒng)前一步是否已有輸出信號(hào)及其受控機(jī)械動(dòng)作是否已完成。若前一步的動(dòng)作未完成，則后一步的動(dòng)作無(wú)法執(zhí)行。這種控制系統(tǒng)的互鎖嚴(yán)密，即便轉(zhuǎn)步主令信號(hào)元件失靈或出現(xiàn)誤操作，亦不會(huì)導(dǎo)致動(dòng)作順序錯(cuò)亂。
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DEMAG/BARRETT CARDCAGE ADAPTER BD. DF65087649 80-13490-2
GE THYRISTOR MODULE 410403-24AC 7326
HONEYWELL R352C12183 TEMPERATURE CONTROLLER
TOKYO FLOW METER CO USF200M
CROUSE-HINDS CONDUIT 2" T67
NMB-MAT COOLING FAN 4715MS-23T-B30
GE FANUC ROBOTICS CABLE
EGS HEVI-DUTY .075KVA INDUSTRIAL CONTROL TRANSFORMER E075
BALSBAUGH RESISTIVITY METER 2220 105148
ASHCROFT 125/250V 15A 500 PSI SNAP ACTION SWITCH, B7-61-B
EUCHNER MAGNETICALLY CODED SAFETY SWITCHES, CMS-M-AG NNB LOT OF 10
YOKOGAWA 2093A10 PANNEL METER NIB
GENERAL ELECTRIC 300V CONTACT BLOCKS, 080B02D, NIB LOT OF 5
LARCO SAFETY MAT SYSTEM 24X48 L122310511 NIB
THYRISTOR MODULE 1538A96H10 8027
THYRISTOR MODULE 1538A96H10 7748
AB 700-CF400D W/ 100-F
DECCO 115V 60HZ COIL, 9-113M
SHIMPO DIGITAL TACHOMETER DT-107
CONTROLOTRON SYSTEM 1010 MULTIFUNCTION ULTRASONIC FLOWMETER 1010FTN1
0-1.0 OIL FILLED GAUGE
SIEMENS CONTACTOR 3TH4244-0B
BRIDGEPORT 231-DC2 EMT CONNECTOR, LOT OF 25, NIB
MAHR / FEDERAL MODEL VM, UNIT E INDICATOR 04792658-G-020A?03A / 00380 / IND-1024
COSEL POWER SUPPLY K150AU-24
SIEMENS * CIRCUIT BREAKER 800AMP 600V 3P * LMD63F800
FEDERAL 0.01mm UNIT M, MODEL VM DIGITAL INDICATOR IND-1020
RIB RELAY RIBU2C, NNB
BIDDLE DETEX ELECTRONIC VOLTAGE DETECTOR CC-360/11-36-US / 514360-3
ALLEN BRADLEY FLEX I/O MODULE 1794-IB16 WITH TERMINAL BASE
MAHR / FEDERAL 0.01mm, UNIT A, DIGITAL INDICATOR 04792658-G-020A?03A
WESTINGHOUSE KILOWATT HOUR METER 7303C23G11
B-LINE B768-22 HORZ TEE STRUT LOT OF 10 NIB
CUSTOM CONTROL SENSORS 125/250/480VAC 15A 750 PSIG PRESSURE SWITCH, 604G1
PSYTRONICS TRANSIENT VOLTAGE SURGE SUPPRESSOR P1301
MONNIER COMPACT FILTER 204-2200-2 NIB
SCHMERSAL 500V 10A LIMIT SWITCH W/O HEAD, TR 335-20Z
FESTO 20MM PISTON 125MM STROKE PNEUMATIC CYLINDER, DSNU-20-125P-A NNB
BROOKS MT 3810 VARIABLE AREA FLOWMETER TRANSMITTER 3810A13C1PAA1A1 *RUBBER*
THOMAS & BETTS 143 1" LOCKNUT, LOT OF 50, NIB
NUMATICS GAUGE 0-100PSI
MAHR / FEDERAL 0.01mm, UNIT J, INDICATOR 00496 / 04792659-G-350A?01A / IND-998
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OMRON 100VAC TRANSMITTER K3FK-PRU-21-B
EUCHNER TP3-4131A024PG SAFETY SWITCH, NO BOX
CONAIR 209-598-04
DWYER INSTRUMENTS 35 PSIG 120F PRESSURE TRANSMITTER, 603A-7
AEROSPACE CONTROL PRODUCT CME 50A-3-.3LAID AIR GAUGE, NO BOX
GENERAL ELECTRIC STARTER GR208B100AAA SIZE 0 600AC 18 AMP
ANTUIES CONTROLS -17-6.0"WC 8024204025 CONTROL SWITCH
DAYTRONIC 3170 DC STRAIN GAGE CONDITIONER, NIB, SEALED IN BAG
TPC WIRE & CABLE 8P MALE RECEPTACLE, 84880, NNB
APPLETON UNILET 1"T FORM 35 NNB
ASHCROFT DURALIFE 0-15PSI OIL FILLED GAUGE
HONEYWELL MICRO SWITCH SENSING AND CONTROL 972AA3XM-A3P-L-?050 NIB
DANFOSS CYCLETROL 150 240VAC 22A 1PH MOTOR CONTROLLER, 176B6003
BROOKS MT 3810 VARIABLE AREA FLOWMETER TRANSMITTER 3810A13D1RAA1A1
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SIMPSON PERCENT LOAD 89G402
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