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PLC的外部設(shè)備主要是指控制系統(tǒng)中的輸入輸出設(shè)備，其中輸人設(shè)備是對(duì)系統(tǒng)發(fā)出各種控制信號(hào)的主令電器，在編寫(xiě)控制程序時(shí)必須注意外部輸入設(shè)備使用的是常開(kāi)還是常閉觸點(diǎn)，并以此為基礎(chǔ)進(jìn)行程序編制。否則易出現(xiàn)控制錯(cuò)誤。
在PLC內(nèi)部存儲(chǔ)器中有專用于輸入狀態(tài)存儲(chǔ)的輸入繼電器區(qū)，各輸入設(shè)備（開(kāi)關(guān)、按鈕、行程開(kāi)關(guān)或傳感器信號(hào)）的狀態(tài)經(jīng)由輸入接口電路存儲(chǔ)在該區(qū)域內(nèi)，每個(gè)輸入繼電器可存儲(chǔ)一個(gè)輸入設(shè)備狀態(tài)。PLC中使用的"繼電器"并非實(shí)體繼電器，而是"軟繼電器"，可提供無(wú)數(shù)個(gè)常開(kāi)、常閉觸點(diǎn)用于編程。每個(gè)"軟繼電器"僅對(duì)應(yīng)PLC存儲(chǔ)單元中的一位（bit），該位狀態(tài)為"1"，表示該"軟繼電器線圈"通電，則程序中所有該繼電器的觸點(diǎn)都動(dòng)作。輸入繼電器作為PLC接收外部主令信號(hào)的器件，通過(guò)接線與外部輸入設(shè)備相聯(lián)系，其"線圈"狀態(tài)只能由外部輸入信號(hào)驅(qū)動(dòng)。
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廈門(mén)莫格電氣自動(dòng)化有限公司
張芳（銷(xiāo)售工程師）
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1-1/2 STEEL GATE VALVE R48468
ASCO T574806 SOLENOID VALVE 1/2" *NEW*
SPIRAX SARCO MAIN VALVE ASSEMBLY FT 14 1/2"-3/4"
SMC, 1-1/4" NPT, 1 MPA MAX, 5-60oC, 30DB, SILENCER NAN700-N12 *NEW*
SHARPE 1/2"NPT 1000CWP TWO WAY STAINLESS STEEL BALL VALVE 8HYJB
SPORLAN SEE-ALL 1-1/8"ODF MOISTURE & LIQUID INDICATOR SA-19S
RESEARCH CONTROL P78S 1/2" BRASS VALVE W/ 73N POSITIONER
PARKER 1/4" NPT 250 PSI 185°F SOLENOID VALVE, 71295SN2KNJ1N0C?111P3 *NEW SEALED*
CONBRACO 3/4"NPT VACUUM BREAKER 38-104 *NEW*
KIP INC. 24/60V 6W 40 MOPD 1/8" X 1/16" ORIFICE SOLENOID VALVE, 142135 *NEW*
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REGO 3/4"NPT 3/8"I.D 150PSIG RELIEF VALVE NRV500BB *NEW*
NIBCO 3/4"NPT GATE VALVE S-113, MSS SP-80
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MARSH INSTRUMENTS 10,000 PSI 800°F 1/4" NPT NEEDLE VALVE, N1552 *NEW*
VNE 1000 WOG 1-1/2 INCH DN40 STAINLESS STEEL BALL VALVE
PARKER 5000 PSI 345 BAR 30 LPM 8 GPM HYDRAULIC NEEDLE VALVE, N820S4 *NEW*
BECKMAN INSTRUMENTS INC. 1-1/4" STEEL GATE VALVE CF8M / 11-905
CRANE 125S 200CWP 1-1/4"NPT GATE VALVE 1
WILKERSON 1/4"NPT, MINIATURE REGULATOR R00-02-000
SWAGELOK 5000 PSIG 100F 1/4 INCH NPT STAINLESS STEEL NEEDLE VALVE, SS-1VS4
BUSCHJOST 0-8 BAR 3/4" NPT 2/2 WAY STANDARD VALVE, 8473300.0000 *NEW*
NELES-JAMESBURY QUADRA-POWR ACTUATOR SERIES C 60 S II W/ 3" VALVE 815L 11 2236TT
OHIO VALVE COMPANY 1000 WOG 1-1/2" NPT STAINLESS STEEL BALL VALVE, 266FTS *NEW*
ALOYCO 1/2" GATE VALVE CF3M 150
PARKER 3 WAY 1/2"NPT BALL VALVE C11 *NEW*
TELEDYNE 1/8"NPT FREE FLOW CHECK VALVE 483-1/8D1-2M4 *NEW SEALED*
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PARKER 3000 PSI 8 GPM 3/8IN. NPT HYDRAULIC PRESSURE CONTROL VALVE, RA600S4 *NEW*
2000 WOG CF 8M 1" BALL VALVE
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PARKER SCHRADER BELLOWS 200 PSI 3/4" NPT 3-WAY MANUAL VALVE, M08561890*
M.A. STEWART AND SONS LTD CSCR-2 1?" NPT CARBON STEEL BALL VALVE, NEW
LEGRIS 1/2" 3-WAY SS BALL VALVE
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NUMATICS 0-160 PSI, 1/4" NPT BACK, 2" FACE, PRESSURE GAUGE 214-188 *NEW*
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SMC VZ1120-5LN-M5 0.15-0.7MPa 24V DC GO S'PORE NEW
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APOLLO 1000 PSIG WOG 3/4" SIZE 3-PC BALL VALVE, 83R-244-02 *NEW*
LEGEND VALVE 150 CWP 2" PVC TRUE union BALL VALVE, T/S-603 *NEW*
FESTO SOLENOID VALVE MFH-3-1/8 / SA-21941 SERIES E802
MILWAUKEE VALVE CO. BALL VALVE 2000 WOG STAINLESS STEEL CF8M 1/2"
GUARDIAN 24V SOLENOID VALVE 4HD CONT 24D *NEW*
ITT ENGINEERED VALVES 150CWP 6" FABRI-VALVE KNIFE GATE VALVE C37S316, LISTING #2
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ARI 1 3/4" SAFETY VALVE EN ISO 4126-1
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R-P&C 1/2" 1500PSI 839F C.S. TYPE SBOX
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SYNDEVCO 40508002 75503/2 WYE SERIES DOUBLE MANIFOLD 3/4 INCH, NNB
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FLOW-TEK 1/4" NPT 1000 WOG CF8M STAINLESS STEEL BALL VALVE, SERIES 700
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