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從定時和計數(shù)控制上看，電器控制系統(tǒng)采用時間繼電器的延時動作進行時間控制，時間繼電器的延時時間易受環(huán)境溫度和溫度變化的影響，定時精度不高。而PLC采用半導(dǎo)體集成電路作定時器，時鐘脈沖由晶體振蕩器產(chǎn)生，精度高，定時范圍寬，用戶可根據(jù)需要在程序中設(shè)定定時值，修改方便，不受環(huán)境的影響，且PLC具有計數(shù)功能，而電器控制系統(tǒng)一般不具備計數(shù)功能。
從可靠性和可維護性上看，由于電器控制系統(tǒng)使用了大量的機械觸點，其存在機械磨損、電弧燒傷等，壽命短，系統(tǒng)的連線多，所以可靠性和可維護性較差。而PLC大量的開關(guān)動作由無觸點的半導(dǎo)體電路來完成，其壽命長、可靠性高，PLC還具有自診斷功能，能查出自身的故障，隨時顯示給操作人員，并能動態(tài)地監(jiān)視控制程序的執(zhí)行情況，為現(xiàn)場調(diào)試和維護提供了方便。
【誠信經(jīng)營】【質(zhì)量可靠】【進口原裝】【拆包防偽】
【超大庫存】【當(dāng)天付款】【順豐速運】【歡迎搶購】
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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
傳 真：0592-6514751
網(wǎng)址：http://www.mogget.cn
誠信經(jīng)營，質(zhì)量為首，誠信至上，莫格電氣竭誠為您服務(wù)！
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PARKER 1/8NPT 1/4"NPT 3 PORTS SOLENOID VALVE 341L534 *NEW*
SWAGELOK, 1/2" TUBE FITTING, BRASS, 2500 PSI, 150oF, BALL VALVE B-45S8 *NEW*
200CWP 1/2" VALVE BODY CF8M
WATTS REGULATOR 1/2" SS BALL VALVE CF8M
WATTS REGULATOR CO. 2X2X1/4" GATE VALVE
NIBCO 3/4" BALL VALVE T586S6R66LL *NEW,SEALED*
VOSS 3/4"NPT HYDRAULIC BALL VALVE PN-800
SMC VS7-6-FG-S-4NA0 3T DC12V VALVE NEW
FESTO PNEUMATIC FILTER REGULATOR LFR-1/8-S-B
BANJO 1" NPT 4-BOLT DESIGN BALL VALVE FP BLTD VALVE Y
DOUBLE A HYDRAULIC PRESSURE REDUCING VALVE, WNNNC-3-3M-10D1?-GS *NEW*
NUMATICS 1/4"NPT, TEE FITTING *NEW* LOT OF 19
PARKER HYDRAULIC 1"X3" METERING VALVE MV1600S EA
AKRON BRASS TORK-LOK 4-1/2" CLAPPER VALVE 1582
SMC 3/8" AND 1/2" THREADS SS FITTING CONTROL VALVE AS4200 101108
DYNAQUIP 1-1/2", 600WOG, VALVE *NEW*
ROSS 1/8``NPT 2 PORTS CHECK VALVE 1968D1005 *NEW*
TOKIMEC DIRECTIONAL CONTROL VALVE DG4V-3-6C-M-P7-?H-7-52
VICKERS SPERRY DIRECTIONAL VALVE DG5S4 064C 51
PARKER * HYDRAULIC VALVE * PC M620S
BINKS 1/8" NPT FLUSHING VALVE, 72-1277 *NEW SEALED*
Newly listedSHARPE VALVE 3/4 1000 CWP
PARKER 5000 PSI 1/8" NPT HIGH PRESSURE CHECK VALVE, 451-1/8S2-125 *NEW*
PARKER 1/2" 2000WOG CF8M SS BALL VALVE
SMC 24VDC 0.15-1.0 MPA 2-POSITION SINGLE SOLENOID VALVE, VSR8-4-FG-S-3VZ *NEW*
NUMATICS 3/8" NPTF MANIFOLD ASSEMBLY KIT, 239-637 SER. ISO 1 *NEW SEALED*
JD GOULD M-1-3T 1/4" 5-125 PSI SOLENOID VALVE, NEW
DELTROL FLUID EASY READ 3/8"NPT CONTROL VALVE EFL 20 S *NEW*
TRABON LUBRIQUIP FLOW CONTROL MODULAR DIVIDER VALVES, MSP-25S *LOT OF 2*
G.I.E. WEIR STYLE 1/2" NPT CAST IRON DIAPHRAGM VALVE, WTCX223M.50 *NEW*
VICKER DIRECTIONAL VALVE DG4V-3S-6C-VM-F?PBWL-B5-60
FESTO 45-145 PSI SOLENOID VALVE MFH-5/2-D-2-FR-?C *NEW*
MILWAUKEE VALVE CO. BALL VALVE STAINLESS STEEL CF8M 1500 WOG 1-1/4"
SMITH 7-1/2" OD 3-1/4" ID 450PSI GREEN THREAD ELBOW VALVE B-50-1
MAC 24VDC 2.4W 150 PSI PNEUMATIC COIL, DMB-DFFP-1DS2 *NEW NO BOX*
DAIKIN THROTTLE VALVE WITH CHECK N5S-OC-G-50-76 *NEW,SEALED*
ROCON WATER CONTROL VALVE WCV-S-4-H-7-E3A?5F1-D1-LR-E5C2
PARKER 5000 PSI 5 GPM 1/4" NPT HYDRAULIC CHECK VALVE, C400S-10HT *NEW*
NIBCO 3/8" NPT 2000 WOG CF8M STAINLESS STEEL BALL VALVE, T580S6R66 *NEW*
SUN HYDRAULIC 1-1/4"NPT 1-1/2"NPT HYDRAULIC VALVE 9HJ5 / 267627-B *NEW*
FLUSH VALVE CHROME 1" X 1-1/4" H-740 SERIES
NUMATICS 1/4"NPT, 150PSI, 120oF, PNEUMATIC FILTER F10C-02 *NEW*
FESTO 5-10 BAR CONTROL VALVE GR-1/8B0 151215 K008
PARKER 250PSI, 2-PORT, 3/8"NPT FLOW CONTROL VALVE 3250G0319 *NEW*
ITT BELL & GOSSETT 125PSI 5/8"NPT REDUCING VALVE 110190 / B-38
NORGREN 150-300PSI 175°F 1/4"NPT REGULATOR R08-300-RGMA *NEW*
NOLFF'S FUEL SAFETY VALVE N3-0173
ROSS 1/4"NPT 150PSI ROLLER VALVE 1133A2002 *NEW*
NIBCO 2000 WOG CF8M 3/4" NPT BALL VALVE, T560S6R66LL *NEW*
ALCO CONTROLS 3/8" ODF-1/2" ODM SOLENOID VALVE 200RB 4S3-M NIB
STOCKHAM BRASS 3/4" GATE VALVE 1000-OWG 300S 104901
1" VALVE ACTUATOR JV1SF1B3A00S-JR?2A1 104069
RUB 600 CWP 1 INCH NPT HOT FORGED BRASS BALL VALVE, S.92
WATSON / McDANIEL 3/4" NPT INVERTED STEEL TRAP 1032 *NEW IN BOX*
VICKERS 3/4" NPT CHECK VALVE, C2815S3 *NEW*
NUMATICS 120V, 60HZ, 1/4" & 3/8" NPT, 5-PMALE, SOLENOID VALVE 12DDF481XA
NUMATROL 1/8" NPT PRESSURE VALVE TMO-2112 *NEW*
ASCO 3/4 INCH, 5-125PSI, 24VDC, SOLENOID VALVE EF8210G3V *NEW
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