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從控制方法上看，電器控制系統(tǒng)控制邏輯采用硬件接線，利用繼電器機(jī)械觸點(diǎn)的串聯(lián)或并聯(lián)等組合成控制邏輯，其連線多且復(fù)雜、體積大、功耗大，系統(tǒng)構(gòu)成后，想再改變或增加功能較為困難。另外，繼電器的觸點(diǎn)數(shù)量有限，所以電器控制系統(tǒng)的靈活性和可擴(kuò)展性受到很大限制。而PLC采用了計(jì)算機(jī)技術(shù)，其控制邏輯是以程序的方式存放在存儲(chǔ)器中，要改變控制邏輯只需改變程序，因而很容易改變或增加系統(tǒng)功能。系統(tǒng)連線少、體積小、功耗小，而且PLC所謂“軟繼電器”實(shí)質(zhì)上是存儲(chǔ)器單元的狀態(tài)，所以“軟繼電器”的觸點(diǎn)數(shù)量是的，PLC系統(tǒng)的靈活性和可擴(kuò)展性好。
【誠(chéng)信經(jīng)營(yíng)】【質(zhì)量可靠】【進(jìn)口原裝】【拆包防偽】
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廈門莫格電氣自動(dòng)化有限公司
張芳（銷售工程師）
電 話：0592-6514182/17750626260
Q Q：177763184
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誠(chéng)信經(jīng)營(yíng)，質(zhì)量為首，誠(chéng)信至上，莫格電氣竭誠(chéng)為您服務(wù)！
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STOCKMAN VALVE HANDLE LKG DEV F/1.1-1/4"T/S-2?55 *NEW* LOT OF 2
FESTO DISTRIBUTION MANIFOLD FR-8-1/4
ASCO RED HAT SOLENOID VALVE 1-1/4" 8210G8
ROLVALVE 3" KNIFE GATE VALVE S17 A 3 489
MILWAUKEE 1/4" CF 8M BALL VALVE 2000 WOG
PARKER 1/4"NPT, 3/8"NPT. FITTING *NEW,LOT OF 4*
MILWAUKEE 1-1/4"NPT 100WOG BALL VALVE CF8M *NEW*
INLINE CF8M STAINLESS STEEL BALL VALVE 1/4" 1000WOG
APOLLO 3/4" SS BALL VALVE CF 8M 2000 WOG
NUMATICS 1/4"NPT, 5-PORT, 145PSIG, AIR PILOT VALVE L12PP552000000 *NEW,SEALED*
DURCO 2" 150 3-WAY BALL VALVE CF8M / 2G4/1-1/2T4
Newly listedHENRY VOGT 3/4" GATE VALVE 86L 150
JOHNSON CONTROLS PENN SIZE 3/4" WATER VALVE V46AC-1 103324
NUMATICS 1/8" NPT PRECISION LIMIT VALVE, 01HA3-B *NEW*
ROVALVE 8" KNIFE GATE VALVE 7 A 8 1 75
APOLLO A108 3/8" NPT 316 S.S CARBON STEEL BALL VALVE, 73-140-01 *NEW*
SHARPE 1/4" 1000CWP SS BALL VALVE CF8M
EASY READ DELTROL FLUID VALVE BRASS 2-3/4" LONG - 1/4" FEMALE THREAD
ROSS 1/8"NPT 1-10BAR 3 PORTS POPPET VALVE 2751A2001*NEW*
LUBRIQUIP DIVIDER OF VALVE MJ5S *NEW, LOT OF 5*
ASCO RED HAT VALVE 8320G13 NEW
PASCAL 1/4"NPT, PNEUMATIC VALVE VPE-S3-SAE#4 *NEW*
JOHNSON CONTROLS 1", 3-6PSIG SPRING RANGE, ACTUATOR VALVE V-3754-1023 *NEW*
SMC SOLENOID VALVE VSS8-6F6-D-3EZ-?V1 NEW
PARKER 1/4"NPT, CHECK VALVE 451-1/4S2-65 *NEW*
DANFOSS DIRECT ACTING SPOOL RELIEF VALVE CARTRIDGE 1G10-P-3S645 *NEW*
WATTS REGULATOR 3/4" 40XL 5 TEMP VALVE M15
BOSCH 10 BAR G1/8 3/2-WAY DIRECTIONAL VALVE, 0820402046
NIBCO / CHEMTROL 3/4" FULL PORT BALL VALVE S51SU V *NEW*
SWAGELOK FRONT FERRULE FOR 1" TUBE S-1613-1 LOT OF TEN *NEW*
DWYER 1/8" NPT 1/4" TUBE O.D. 3-WAY PLASTIC VENT VALVE, A-310B *NEW LOT OF 3*
SHICK * ROTARY VALVE 11-1/8 OD X 7-7/8" ID * S-225-1
MILWAUKEE VALVE CO. 3/4" 2000WOG SS BALL VALVE CF8M
CASHCO INC. 3/4"NPT 250PSI PRESSURE REGULATING VALVE 2B5-7S27-120000?00B
HAM-LET 316 STAINLESS STEEL 1/4"NPT VALVE FITTING SW6 *NEW NO BOX*
FESTO 13.8-120PSI SOLENOID VALVE MFH-3-1/4-S C402
FESTO SOLENOID VALVE MEH-5/2-1/8-P-B W/ MEH-3-0.9
TELEDYNE 5000 PSI 3/8" NPT HYDRAULIC CHECK VALVE, 453-3/8S2-6 *NEW*
EG&G SEALOL 1-3/4" BORE BELLOW SEAL 590697-H20 *NEW*
WATTS 3/4", 2000WOG, BALL VALVE 9624 *NEW*
FISHER CONTROLS 3/8" STEM 2-1/8" BOSS PACKING REPAIR KIT, RPACKX00012 *NEW*
FESTO PNEUMATIC FLOW CONTROL VALVES, GRLO-M5-B, NEW LOT OF 8
FLUID CONTROL HYDRAULIC VALVE 4K35-N6-12G-2-S
FLOW-TEK 1" SS BALL VALVE S70.316 CF 8M S1593
CRANE 7&1/2E RISING STEM GATE VALVE, NEW LOT OF 2
TELEDYNE 5/8'NPT 5000PSI 453-3/8S2-6 FREE FLOW VALVE *NEW*
CHECK VALVE 12C1S K6
DYNAQUIP 1" NPT 1000 WOG STAINLESS STEEL BALL VALVE, CF8M *NEW*
HENRY 3/8" STRAIGHT THRU RELIEF VALVE 5231 NEW
Newly listedVOGT 1-1/2" GATE VALVE H2MM
3/8" GATE VALVE 125
GIACOMINI 1-1/2" 175 PRESSURE REDUCING VALVE 12HO NIB
GREAVES COPPER CLAMP FITTINGS 1 1/4-2 10/2
PARKER 5000 PSI 1/4" NPT CHECK VALVE, 451-1/4S2-125 *NEW*
Newly listedBONNEY FORGE 1-1/2" 800 GATE VALVE A105
LADISH STEEL 1-1/2" CHECK VALVE CF8M DWN
VICKERS 5000PSI 1/2"NPT PRESSURE CONTROL VALVE DG4V-3S-7A-M-FW?-B5-60
ITT ENGINEERED VALVES 150CWP 6" FABRI-VALVE KNIFE GATE VALVE C37S316, LISTING #3
DOUBLE A HYDRAULIC SOLENOID VALVE, SQ-005-1M-21A2
VICKERS HYDRAULIC VALVE DG4V-3S-2A-M-U-?B5-60
FLO-TEK 1/2" BALL VALVE S70 CF8M
FESTO 8BAR SOLENOID VALVE MEH-5/2-1/8-P-B
ROSS 1/4"NPT 150 PSI ROLLER VALVE, S1133A2C01 SERIES 11 *NEW*
SMC 1/2" NPT 3/8" TUBE FLOW CONTROL VALVE, AS4201F *NEW*
APOLLO 3/4" UNTHREADED BALL VALVE 600WOG 1 LOT OF 2
ROSS CONTROLS 2-10 BAR 1/2" & 3/4" NPT L-O-X/EEZ-ON VALVE, 1523B4102 *NEW*
NUMATICS 2-POSITION 4-WAY DOUBLE AIR PILOT VALVE, 152JJ400O000000 *NEW SEALED*
BRADLEY 3/4"NPT BALL VALVE S30-042 *NEW*
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