ABB HESG447260R2

DCS控制系統(tǒng)與PLC控制區(qū)別
??? 1. DCS是一種“分散式控制系統(tǒng)”，而PLC只是一種(可編程控制器)控制“裝置”，兩者是“系統(tǒng)”與“裝置”的區(qū)別。系統(tǒng)可以實(shí)現(xiàn)任何裝置的功能與協(xié)調(diào),PLC裝置只實(shí)現(xiàn)本單元所具備的功能.
　　2. 在網(wǎng)絡(luò)方面,DCS網(wǎng)絡(luò)是整個(gè)系統(tǒng)的中樞神經(jīng)，和利時(shí)公司的MACS系統(tǒng)中的系統(tǒng)網(wǎng)采用的是雙冗余的100Mbps的工業(yè)以太網(wǎng)，采用的國(guó)際標(biāo)準(zhǔn)協(xié)議TCP/IP。它是安全可靠雙冗余的高速通訊網(wǎng)絡(luò)，系統(tǒng)的拓展性與開(kāi)放性更好.而PLC因?yàn)榛旧隙紴閭€(gè)體工作，其在與別的PLC或上位機(jī)進(jìn)行通訊時(shí)，所采用的網(wǎng)絡(luò)形式基本都是單網(wǎng)結(jié)構(gòu)，網(wǎng)絡(luò)協(xié)議也經(jīng)常與國(guó)際標(biāo)準(zhǔn)不符。在網(wǎng)絡(luò)安全上，PLC沒(méi)有很好的保護(hù)措施。我們采用電源,CPU,網(wǎng)絡(luò)雙冗余.

Lot of 2 Red PVDF Reducing Bushing Fittings 3/4" to 1/2"
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Lot of Fab-Tech Stainless Steel Fittings 2"Diameter
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Fab-Tech 52421-159 2"x12" Stainless Stain Fitting 6"Diameter-Flan?ge
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Fab-Tech 52421-293 2"x6" Straight Fitting w/ Elbow
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Fab-Tech 52421-248 2" Diameter Elbow Fitting 90degree-angle
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Fab-Tech 52421-204 2"x9.5" Straight Fitting w/ Lateral Tap
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New Fab-Tech HTB02 2" Field Flange
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Fab-Tech 52421-48 2"x36" Stainless Stain Fitting 6"Diameter-Flan?ge
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Fab-Tech 52421-57 Stainless Steel Straight Fitting 2" x 17.5"
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Fab-Tech 55264-16 2" Diameter Elbow Fitting 45degree-angle
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Fab-Tech 52421-139 2"x6"L Stainless Stain Fitting 6"Diameter-Flan?ge
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Fab-Tech 53028-18 PSP 3"x16"L 2"Tap Stainless Steel Fitting
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3/4" x 6" PP Straight Fitting
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Nibco 3/4 PP Tee Valve
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New Entegris FL12-1 Flaretek Nut
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New Entegris FME8-8 Elbow Fitting 1/2"
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New Furon FMP12UT Tee Fitting 3/4"
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New Entegris E16-16TFN-3 Fluoroware Elbow Fitting 1"OD Tube
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New Entegris USE8FN-1 Sweep Elbow Fitting 1/2"Tube
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New Entegris UT16FN-1 Fluoroware Tee Fitting 1"OD Tube
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New Entegris UT12-8-12FN-1 Tee Fitting 3/4"OD Tube x 1/2"OD Tube x 3/4"OD Tube
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New Parker FTCR-16168 Tee Fitting
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New Entegris UT8-8T-8FN-1 Tee Fitting
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New Entegris UT16-16-16TFN-1 Tee Fitting 1"OD

New in Package Entegris UT16T-16-16TFN-?1 union?Tee Fitting PFA 1" Spacesaver
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New Entegris UT8TFN-1 Tee Fitting 1/2"
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New Entegris E4-4FN-1 Elbow 1/4"OD x 1/4"MNPT
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New Entegris WTA16-16TFN-1 1" Flaretek Straight Adapter
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New Pillar P-RUTAW8-W6-TW8?AS Reducing union?Tee Adapter Fitting 1"
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New Parker FECR-6RF4 Flare Elbow Connector Reducer Fitting
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New Parker CASY-2148 Valve with SB10
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Goodyear 8' Airhose 1/4" Diameter 250PSI Black w/Quick Connect Plugs
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Lot of 4 New Parker 2-456 Silicone O-Rings FDA Compliant -65°F to +425°F A70
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Lot of 25 New in Bag McMaster-Carr 240 S70 Silicone O-Rings 4" OD 1/8" Thickness
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Agru 110x10.0 SDR11-ISO S5 Multi-Bend 90-Degree Fitting
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Lot of 5 New Georg Fischer 721150111 63mm 45° PVC-U Elbow Grey +GF+
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Lot of 6 Spears 884-040 Nipple 1"x4" PVC
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Bag of 25 Spears 884-040 Nipple 1"x4" PVC
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Lot of 10 NIB Nibco Chemtrol 6101-3-3 1" Threaded Couplings SCH 80 Black PolyPro
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New Box of 25 Spears 884-040 Nipple 1"x4" PVC
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New Hayward BFA1010TES Bulkhead Fitting 1" FNPT
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Lot of 4 Foster P13 Hose Ends 1/2" NPT x 1/2" Hose
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New Box of 5 Parker 2-2 MHLN-SS 1.5 Hex Long Nipple 1/8" MNPT 9100PSIG 316SS
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Lot of 8 B-Line B2609 3/4" Pipe Hangers
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Lot of 12 Caddy SK12 3/4" Pipe Clamp Hang

Sanitary Pipe Clamp 1"
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Tylok SS-10-2FE-8 1/2FPN x 5/8 316L Elbow Fitting Female

Cole Parmer EW-06384-71 Adapter Pipe 1/4" to 1/8" NPT Female
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Tylok SS-8-DU-8 1/2" Stainless Steel Tube Fitting
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Gates 5/8" ID Black Rubber Hose 80' (24.38m) 300PSI WP
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Sanitary Fitting Adapter 1 " NPT to 1 1/2 " Flange
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Sanitary Fitting Adapter 1" NPT to 5/8" ID 1" Flange
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Sanitary Fitting 5/8" Elbow 90° 1" Flange to 2" Flange SS316L
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Sanitary Fitting Adapter 1 3/4" NPT to 1 3/8" Pipe Clamp
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Plastic to Cast Iron Plumbing Coupling 6" x 6"
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12FT Cable Tubing 2.25"-Diameter
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3 inch Sanitary Clamp
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New Lot of 10 O-Rings EPDM 10-1/2 x 10-7/8
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New Lot of 200 O-Rings Nitrile Buna-N 1-7/16" x 1-11/16"
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New Lot of 6 1" O-Rings

Lot of 7 O-Rings 140mm BUNA
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Lot of 22 2-1/4" O-Rings EPDM
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New Lesker MH-SPL328 Bellows 4"-ID 7.5"-OD 12"-OAL