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 PLC的外部設備主要是指控制系統中的輸入輸出設備，其中輸人設備是對系統發出各種控制信號的主令電器，在編寫控制程序時必須注意外部輸入設備使用的是常開還是常閉觸點，并以此為基礎進行程序編制。否則易出現控制錯誤。

 在PLC內部存儲器中有專用于輸入狀態存儲的輸入繼電器區，各輸入設備（開關、按鈕、行程開關或傳感器信號）的狀態經由輸入接口電路存儲在該區域內，每個輸入繼電器可存儲一個輸入設備狀態。PLC中使用的"繼電器"并非實體繼電器，而是"軟繼電器"，可提供無數個常開、常閉觸點用于編程。每個"軟繼電器"僅對應PLC存儲單元中的一位（bit），該位狀態為"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都動作。輸入繼電器作為PLC接收外部主令信號的器件，通過接線與外部輸入設備相聯系，其"線圈"狀態只能由外部輸入信號驅動。

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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*
 
DYNAQUIP 600 CWP 3/4" NPT TWO-PIECE BRASS BALL VALVE, VMH2-A9 *NEW*
 
SMC AIR REGULATOR SET PRESS 7~100PSI NAR111
 
PARKER 150 PSIG 1/4" NPT ROLLER CAM VALVE, CW1325 *NEW*
 
ITT FABRI-VALVE 150 CWP 8" KNIFE GATE VALVE C37S316FR1
 
ASCO 120VDC SOLENOID VALVE 8210D14 NEW
 
MATCO 3/4"NPT, 200WOG, FLOW CONTROL VALVE NSF61-8 *NEW*
 
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
 
FLOTECT 125/250VAC, 5A, 3/4 INCH, FLOW SWITCH V6EPB BS2BGM7 *NEW*
 
KECKLEY 3/4" NPT 400 MOG CAST BRONZE Y-STRAINER VALVE, STYLE F-300 *NEW*
 
SCHRADER BELLOWS 1/4" NPT FLOW CONTROL VALVE 3251-0250 *NEW*
 
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
 
ROSS 1-10 BAR 1/2" NPT L-O-X LOCK-OUT VALVE, 1523B4002 *NEW*
 
NIBCO 3/8"NPT, BALL VALVE T580S6R66 *NEW,SEALED*
 
UFM TYPE 12-13 FLOW METER 01.5GM-2-335S-A?3NR
 
FLOWSERVE 3/4" 1975@100°F GATE VALVE 41365-2R14
 
NUMATICS 150PSIG, 5-PORT, 1/8"NPT, RELAY VALVE 031PA400O000000 *NEW*
 
NUMATICS 1/8" NPT PNEUMATIC VALVE, 1JDPA4 *NEW*
 
MASONEILAN DRESSER 4" X 6" VALVE ACTUATOR SIZE 38
 
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
 
PARKER 3/8"NPT PNEUMATIC VALVE PWR-A3833 *NEW*
 
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*
 
MAC 3/8IN. NPT 5 PORTS BASE MANIFOLD VALVE 92B-000-CL4 *NEW NO BOX*
 
PARKER 5000 PSI 5 GPM 19 LPM 1/4"-18NPT NEEDLE VALVES, N400S-11HA *NEW LOT OF 2*