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從工作方式上看，在繼電器控制電路中，當電源接通時，電路中所有繼電器都處于受制約狀態(tài)，即該吸合的繼電器都同時吸合，不該吸合的繼電器受某種條件限制而不能吸合，這種工作方式稱為并行工作方式。而PLC的用戶程序是按一定順序循環(huán)執(zhí)行，所以各軟繼電器都處于周期性循環(huán)掃描接通中，受同一條件制約的各個繼電器的動作次序決定于程序掃描順序，這種工作方式稱為串行工作方式。

從控制速度上看，繼電器控制系統(tǒng)依靠機械觸點的動作以實現(xiàn)控制，工作頻率低，機械觸點還會出現(xiàn)抖動問題。而PLC通過程序指令控制半導體電路來實現(xiàn)控制的，速度快， 程序指令執(zhí)行時間在微秒級，且不會出現(xiàn)觸點抖動問題。

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廈門莫格電氣自動化有限公司
張芳（銷售工程師）
電  話：0592-6514182/17750626260
Q    Q：177763184
郵  箱：177763184@qq.cm
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WATTS REGULATOR CO. 150PSI 3/4"NPT VALVE M7 STD.Z21.22
 
PARKER 1/4", CHECK VALVE 451-1/4S2-65 *NEW*
 
TRICENTER 6" ANSI 150 VAVLE A351 CF8M ATWOOD & MORRILL 20199
 
ITT S316 SIZE 6" KNIFE GATE FABRI-VALVE F440743 67
 
MILWAUKEE VALVE 3/4" SS BALL VALVE CF 8M 2000 WOG
 
WATTS 3/4"NPT 2000WOG BALL VALVE 9338 *NEW*
 
FLOW-TEK 3" STAINLESS STEAL BALL VALVE F15 CR8M
 
NUMATICS 1/8"NPT, 5-PORT, PNEUMATIC SOLENOID VALVE 11PAD4410 *NEW, SEALED*
 
ALCO CONTROLS 3/8" INLET/OUTLET, REFRIGERANT SOLENOID VALVE 200RB 4T3M *NEW*
 
WATSON MCDANIEL 1/2" NPT, 80 PSIG INVERTED STEAM TRAP SERIES 1031
 
DEVILBISS 3/8"NPT BALL VALVE VA-540 *NEW,SEALED*
 
ROSS 1/8" & 1/4" NPT, SUB BASE 460K91 REV. D *NEW*
 
MANNESMANN 6-1/4IN. x 3IN. OAL PILOT OPERATED CHECK VALVE Z2S-10-1-32/ *NNB*
 
WATTS 1"NPT 600WOG BRONZE BALL VALVE 0513 *NEW*
 
SOLENOID VALVE EF8004A1 NEW
 
PHD 5"OAL, CYLINDER HVRF1X11/4, 342840-01 901
 
NUMATICS 1/4"NPT PRECISION LIMIT VALVE 0HA4-B *NEW,SEALED*
 
KINGDOM P. CASTING 3/4"NPT STAINLESS STEEL VALVE CF8M *NEW*
 
ASCO RED-HAT 150 PSI 1/2" NPT CHECK VALVE, V0127 *NEW*
 
CASHCO 250 CWP 180°F 1-1/2" NPT PRESSURE REDUCING REGULATOR, D CI/CI/S3 *NEW*
 
ITT FABRI-VALVE S316 150CWP 6" KNIFE GATE VALVE %FV-C3702421700
 
JAMESBURY SPRING ACTUATOR VALVE CF8M CLASS-300 1-1/2-530S
 
ROVALVE 150PSI 8" KNIFE GATE VALVE S17-D MSS/HYC
 
FAUNC 1/4"NPT REGULATOR RG0005 *NEW*
 
FESTO PNEUMATIC SOLENOID VALVE MEH-5/2-1/8-P-S?-B
 
SURE SEAL 1/4"NPT 5" DIA BUTTERFLY VALVE FDL-1-2-31CR-9
 
ROCON WCV-B-0-H-7-E3C?5F2-D1-L-E6C2 120VAC/24VDC WATER CONTROL VALVE
 
DOERING 1/8"NPT1-1/2"DI?A CARTRIDGE VALVE 947204015 *NEW*

ARMSTRONG 3/4" NPT, 200 PSI INVERTED BUCKET STEAM TRAP C5318-5 *NEW*
 
PROPORTION-AIR 150PSI 158F 1/4"NPT 3 PORTS REGULATOR RG0005 *NEW*
 
ROBINAIR 40296 PIERCING VALVE 3/8 7/16 1/2 NIB
 
BOSCH 1/4"NPT FLOW CONTROL VALVE 001 0821200162 568 *NEW*
 
SPORLAN COIL ASSEMBLY 3/8" ODF X 1/2" ODM SOLENOID VALVE MB6S1
 
VICKERS CHECK VALVE DT8P1-05-3C-11 NEW
 
AVCO 3/4" 800WP PRESSURE VALVE 316HF-S
 
CRANE 3/4" 150S 300CWP GATE VALVE 17 TF
 
SMC 3/8" NPTF SUBPLATE, VQ4000-P-03T *NEW*
 
CRANE 634E 2" GATE VALVE 300S 1000 CWP
 
NIBCO / CHEMTROL 3/4" FULL PORT BALL VALVE S51SU V *NEW, SEALED*
 
BINKS 1/8" NPT FLUSHING VALVE, 72-1277 *NEW*
 
DOUBLE A PRODUCTS 1/2"NPT VALVE DL-04-10A1 *NEW*
 
WATTS REGULATOR 1/2" SS BALL VALVE CF 8M
 
FESTO 5-145 PSI 1-10 BAR 1/4" NPT PNEUMATIC VALVE, 6682 *NEW SEALED*
 
ALOYCO 3/4" 150 STEEL GATE VALVE CF8M
 
EMERSON 3/8X1/2" THERMAL EXPANSION VALVE HFES 5-1/2 HC / 054141 NIB
 
WATTS REGULATOR COMPANY 3/4" 125 PSI RELIEF VALVE 100XL-3M7
 
TYPE 6800 3/4" BALL VALVE SELC
 
EXOTIC FLUID CONNECTORS PHC1/4FG-S *NEW BAG OF 9*
 
REXROTH NUMATICS 1/4" NPTF FLOW CONTROL VALVE, 540-603-600-1 *NEW*
 
ITT ENGINEERED VALVES 150CWP 6" FABRI-VALVE KNIFE GATE VALVE C37S316
 
MILWAUKEE VALVE COMPANY CF8M BALL VALVE 1/4"
 
DANFOSS DIRECT ACTING SPOOL RELIEF VALVE CARTRIDGE 1G10-P-3S645 *NEW NO BOX*
 
ALEMITE 7500 PSI 1/4 IN. INLET 1/8 IN OUTLET HIGH PRESSURE CONTROL VALVE, 6320-3
 
HYDRAULIC FLOW CONTROL CHECK VALVE 5S VP6
 
PFK 2" 4-WAY STEEL VALVE A105 83 / 36-3X1 3M
 
ALKON 3/4" NPT IN-LINE CHECK VALVE JC6N *NEW*
 
PARKER 5000 PSI 8 GPM HYDRAULIC FLOW CONTROL VALVE, F820S *NEW*
 
HONEYWELL 4" 3-WAY FLANGED GLOBE VALVE VGF31EM40, NEW
 
CONTROMATICS 1/2"NPT 600PSI TYPE B-6800 BALL VALVE LC *NEW*
 
WATTS VALVE RUBBER REPAIR KIT RK 909-RT 2-1/2-3
 
FESTO 21-120PSI SOLENOID VALVE MFH-3-1/4-S VN02
 
SHARPE 1000 CWP CF8M 3/4 INCH NPT STAINLESS STEEL BALL VALVE
 
SPEARS * 1 1-/2" VALVE WITH FLANGE * -
 
TRIAD 1000 WOG 1-1/4" NPT BALL VALVE, CF8M *NEW*
 
SMC 0.1-0.85MPA, 3/8"NPT, REGULATOR NAR3060-N03 *NEW*
 
DeZURIK CF8M 10" KNIFE GATE VALVE