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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(zhuān)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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VICKERS PRESSURE REDUCING VALVE DGMX2-3-PA-BW-S?-40 *NEW*
APOLLO BALL VALVE 3/4 C.S. 1000 WOG
LADISH 1-1/2" 600 CF8M GATE VALVE 8664-2407-15
UNKNOWN MFG * 2 WAY FLOW CHECK VALVE 200WOG * 3/4"
LADISH-HASCO 1-1/4" 200 CF7M GATE VALVE 1201-007 / V-7250-0007-12
PNEU-TROL 1/2"NPT CHECK VALVE C-30-S *NEW NO BOX*
SHARPE 800 WOG CF8M 1/4 INCH NPT STAINLESS STEEL BALL VALVE, 58876
FESTO 36-116PSI SOLENOID VALVE MEH-5/2-1/8-P-B
MOORE PRODUCTS CO. NULLMATIC PRESSURE REGULATOR 40-15 / 14870-4S5EG 104115
FESTO, VALVE KIT CPC14-BS-5/3G1/?8 NEW IN BOX
AIRTECH CONTROLS 1/8" & 1/2" NPT, PNEUMATIC VALVE BLOCK N-65031 *NEW*
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ITT FABRI-VALVE 150 CWP 8" KNIFE GATE VALVE C37S316FR1
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APOLLO 1IN. NPT "Y" SHAPED STRAINER VALVE YCT05M20 *NEW,SEALED BAG*
SPORLAN 3/8" ODF X 1/2" ODM SOLENOID VALVE LESS COIL A3S1 NIB
ITT 9-5/8" X 2" PIPE SIZE PURE-FLO DIAPHRAGM VALVE CFM8 CWP-150 7081358
NUMATICS 3/4" NPT VALVE BODY 5FC3
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KECKLEY 3/4" NPT 400 MOG CAST BRONZE Y-STRAINER VALVE, STYLE F-300 *NEW*
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PARKER 1/4IN. NPT 3/8IN. NPT QUICK EXHAUST/SHUTTLE VALVE 3340
JAMESBURY 3/4" SS BALL VALVE CF 8M 2000 WOG NACE
STOCKHAM 1/2" 300CWP GATE VALVE 150 S
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JT 2" BALL VALVE CF8M G0281
ASCO 1/2"NPT 2 PORTS 150PSI HIGH-FLOW CHECK VALVE V0127 *NEW*
STAINLESS STEEL 1 1/2" 316 BALL VALVE 1000WOG
SMC 110VAC 2 COIL 1 PLUG SOLENOID VALVE VPN-8-FIG-D *NEW NO BOX*
DELTROL 1/4" NPT EN20S FLOW CONTROL VALVE, 10120-63 *NEW*
MAC 1/2" & 1/4" VALVE 82A-AC-CAA-TM-D?AAP-1DA
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ALOYCO 1/4" 150 STEEL GATE VALVE SW 16540
FESTO 145 PSI PNEUMATIC SOLENOID VALVES, MN1H-2-1/4-MS, NNB LOT OF 7
WATTS 3/4" BALL VALVE 9152 *NEW*
PARKER 3/4IN. NPT 3 PORTS PRESSURE RELIEF VALVE 0R75B *NEW NO BOX*
WATT RELIEF VALVE REPAIR KIT RK 909 VT 3/4-1
SMC 0.1-1.0 MPa 3 PORTS HAND VALVE VHS401-N04-X1 NEW
NULLMATIC PRESSURE REGULATOR 40-30 / 14870-5S10IK
CCS 5 PSIG, 1 1/2" NPT ACTUATOR VALVE 10-3025-1 *NEW*
FESTO 1.5-10BAR VACUUM GENERATOR VAD-1/4 NIB
SS 3/4" BALL VALVE CF8M 1000WOG
VICKERS DIRECTIONAL CONTROL VALVE DG4V-3S-6C-M-FP?A5WL-B5-60 99068
SPIRAX SARCO 1-1/4" & 1-1/2" D-E-F-G FLOAT TRAPS VALVE ASSEMBLY 58134 FT-125 NIB
NUMATICS 1/8" FLOW REGULATOR 1FC1 NIB, LOT OF 3
WATSCO 1/2"-5/8" O.D. TUBE ADJUSTABLE LINE TAP VALVES, A-2 *NEW LOT OF 5*
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