描述

1C31129G03

為了使現(xiàn)場(chǎng)總線滿足可互操作性要求，使其成為真正的開放系統(tǒng)，在IEC國際標(biāo)準(zhǔn)，現(xiàn)場(chǎng)總線通訊協(xié)議模型的用戶層中，就明確規(guī)定用戶層具有裝置描述功能。為了實(shí)現(xiàn)互操作，每個(gè)現(xiàn)場(chǎng)總線裝置都用裝置描述DD來描述。DD能夠認(rèn)為是裝置的一個(gè)驅(qū)動(dòng)器，它包括所有必要的參數(shù)描述和主站所需的操作步驟。由于DD包括描述裝置通信所需的所有信息，并且與主站無關(guān)，所以可以使現(xiàn)場(chǎng)裝置實(shí)現(xiàn)真正的互操作性。

實(shí)際情況是否如上述一致，回答是否定的。目前通過的現(xiàn)場(chǎng)總線國際標(biāo)準(zhǔn)含8種類型，而原IEO國際標(biāo)準(zhǔn)只是8種類型之一，與其它7種類型總線的地位是平等的。其它7種總線，不論其市場(chǎng)占有率有多少，每個(gè)總線協(xié)議都有一套軟件、硬件的支撐。它們能夠形成系統(tǒng)，形成產(chǎn)品，而原IEC現(xiàn)場(chǎng)總線國際標(biāo)準(zhǔn)，是一個(gè)既無軟件支撐也無硬件支撐的空架子。所以，要實(shí)現(xiàn)這些總線的相互兼容和互操作，就目前狀態(tài)而言，幾乎是不可能的

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A0IB2E0529 BT21Q VISOR INTEGRATED SPD, 120KA PANELBOARD

westinghouse lm3800 lm 800 amp breaker 200 amp trip

new Square D JJA JJA36225 225 amp 3 pole 600V Breaker

SILENT KNIGHT 5073 HANDS FREE MASTER ENTRY SYSTEM

cutler hammer Eds Eds3200 3 pole 200 AMP breaker NEW ##

Federal NM622000 800 amp 1200 trip 2 pole Breaker ##

new superior powerstat 208v variable transformer 10 amp

westinghouse kdb2400 kd 400 amp breaker shunt trip

ZINSCO QL2436400 BREAKER QL 3 POLE 400 AMP 240V

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CONTINUUM NETCONTROLLER CPU-8M ANDOVER CONTROLS

NEW Cutler Hammer JDB JDB3175 175 amp 3 pole Breaker

New Simplex 4009-9201 ADDRESSABLE NAC ALARM PANEL

NEW ASCO F222B4K 1″ PIPE SOLENOID VALVE RED HAT

Clipper Power System Surge Protector cutler-hammer

RETROFIT SURGE PROTECTOR NEMA cps120208yaa c-h

SIMPLEX 5120-9180 688-010 PROGRAM DISTRIBUTION PANEL

SIMPLEX 5120-9191 SYSTEM POWER SUPPLY F24-12-A

new ab motor size 2 520-f-cod starter reversing nema

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Square D MA MA3800f 3pole 400 amp TRIP 600V Breaker####

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NEW CUTLER HAMMER dk dk3250w 3 POLE 250 TRIP BREAKER###

new SQUARE D BREAKER EHB34090 ehb 3 pole 90 AMP

Square D LC LC36400 3 pole 600v 400 amp Breaker##

new CUTLER HAMMER JD JD3250F 200 amp breaker jd3200

SQUARE D LE LE36400LI 400 AMP 600V 3 POLE BREAKER

Cutler-Hammer JDC3250F 3 pole 600v 200 amp breaker jd

square d LH LHP26400 2 pole 600v 400 amp Breaker

NEW Square D KAL KAL362501380 250 amp 3 pole Breaker

new SQUARE D JJA JJA36150 3 POLE 150 AMP 600V BREAKER

westinghouse JDB jdb3150C 3 pole 150 AMP TRIP BREAKER

New Simplex 4009-9201 ADDRESSABLE NAC ALARM PANEL#

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Cutler Hammer HND3800T33W 3 pole 800 amp Trip Breaker

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ITE KP3 KP3-F120 1200 amp 3 pole 600V mounting bracket

UTICOR TECHNOLOGY 76711-16 PROGRAMABLE MESSENGER

new Jga36250 jga 250 square d circuit breaker amp ###

Square D Mh Mh26600ac 2 pole 600 amp circuit Breaker

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SQUARE D JJA JJA36250 3 POLE 250 AMP 600V BREAKER

Westinghouse NB3800PF 500 amp 3 pole SHUNT AUX BREAKER

ge tkm3f 1200 amp circuit breaker 3 pole

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Square D KHL KHL3625025DC214?4 250a 3 pole 600v Breaker

ANDOVER CONTROLS NET CONTROLLER CPU-4M CONTINUUM

ITE HJXD HJXD63B225 3 pole 600V 225 amp circuit breaker

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ITE SIEMENS MD6 MD62T700 700 AMP 2 POLE 600V TRIP UNIT

NEW TEXTRON CONE DRIVE RIGHT ANGLE WORM GEAR B06-57630

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ABB 3 POLE T5N BREAKER 400A 400 amp sace TMAX PR211ds

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Ge SGhb sghb36ba0600 400 amp 400 trip Breaker

new SQUARE D BREAKER EHB34070 ehb 3 pole 70 AMP*

GE TKMA2Y1200 1200 amp breaker enclosure disconnect

GE TKMA2Y1200 1200 amp breaker enclosure disconnect

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SQUARE D OMEGAPAK VARIABLE SPEED DRIVE 8804 3r nema ###

SQUARE D OMEGAPAK adjustable frequency controller 3r ##

Siemen Safety Switch Disconnect 400 amp 240v gf325nr 3r

NEW SIMPLEX 4010 PANEL MAIN DISPLAY UNIT

SIMPLEX 4004-9101 FIRE ALARM CONTROL PANEL 841-992

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cutler hammer FDC FDC3070L 70 amp 600V 3 pole breaker

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Square D MHP MHP36500 500 amp 600V 3 pole Breaker

CUTLER HAMMER NEMA 4 STARTER CONTACTOR CN15NN3a 3 POLE

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NEW SQUARE D JJA JJA36200 3 POLE 200 AMP 600V BREAKER

cutler hammer HFDE HFDE322533 3 POLE 225 AMP BREAKER

TOYODA SANYO MC1K-VO30 ABSOLUTE POSITIONING CONTROLLER

Square D I-line Breaker Enclosure HCM 480v 225 amp

Breaker Main Enclosure 400 amp 600v LAL Q4L KAL

new Panelboard Panel Main Breaker 225 amp 408/277v 408v

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75kva transformer 480v/240v-120v 1 phase single 75 kva#

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SQUARE D HEAVY DUTY SWITCH 3R H362AWC ENCLOSURE 60 AMP

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400 amp 480 240v Circuit Breaker Enclosure disconnect##

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westinghouse lm3800 lm 800 amp breaker 150 amp trip ***

GE TS203T20 2000 AMP TRIP UNIT

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HOFFMANS stainless JUNCTION ENCLOSURE BOX A1412CHNFSS

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GOULD ITE LL3-F600 600 AMP 600 TRIP 3 POLE BREAKER ##

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ITE SIEMENS HLD HLD63F600 500 AMP 3 POLE 600V BREAKER

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Square D q4 q432300 3 pole 300 amp Breaker circuit ###

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ITE SIEMENS JXD JXD23m400 400 amp 3 pole BREAKER NEW

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ITE HJ3-F400 3 pole 400 amp 400 trip circuit breaker

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Westinghouse KDB KDB3350w 350 amp 3 pole Breaker

WESTINGHOUSE JB JB3100W 3 POLE 100 AMP SHUNT BREAKER

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SIMPLEX 4020-8001 ANNUNCIATOR FIRE ALARM DISPLAY PANEL

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Gould ITE Circuit Breaker ET KM KM3B800 Amp 800 amp

ITE GOULD EF3 EF3-H150 3 POLE 150 AMP BREAKER ef3-b150

GE TJC TJC36600G 3 pole 600 amp trip 600v breaker

SQUARE D JJA JJA36225 3 POLE 225 AMP 600V BREAKER

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NEW ITE SIEMENS FD fd63b200 200 AMP 3 POLE BREAKER

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GE TKMA2Y1200 1200 amp breaker enclosure disconnect

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Square D LHP LHP36400MT 400 amp 600V 3 pole Breaker

Square D MAP MAP361000 MAP361000-Z 1000 AMP Breaker

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Square D LA LAb36400 3 pole 400 amp Breaker circuit

Square D LHL LHL36250 3 pole 600v 250 amp Breaker

Westinghouse MD3800F 800 amp 600V 3 pole BREAKER

MODICON 91-00745-02 PANEL MATE PLUS AEG IDT 110V

SIMPLEX 4004R 4001-9301 SUPPRESSION RELEASE ALARM PANEL