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1.分層結(jié)構(gòu)的優(yōu)缺點
經(jīng)過大量分析發(fā)現(xiàn)，基于開放性、可靠性和傳輸實時性考慮，目前各DCS系統(tǒng)的通訊網(wǎng)絡(luò)毫無例外地采用分層結(jié)構(gòu)，過程采集數(shù)據(jù)上傳，控制數(shù)據(jù)下傳，不同層次的通訊網(wǎng)絡(luò)可以根據(jù)實際需要采用不同的拓撲結(jié)構(gòu)和不同的通訊協(xié)議，各個層次的相互配合共同構(gòu)成整體通訊體系。從目前來看，各DCS系統(tǒng)一般存在有車間級的現(xiàn)場總線通訊網(wǎng)絡(luò)或者遠程通訊網(wǎng)絡(luò)、電子設(shè)備間的控制網(wǎng)絡(luò)和控制室內(nèi)的操作管理網(wǎng)絡(luò)，如圖1所示，按此配置典型的系統(tǒng)有ABB公司的PROCONTROLP、西門子公司的TELEPERMXP、日立公司的HLACS5000、貝利公司的Svmphony和Honeywell公司的TDC3000。為了簡化系統(tǒng)分層結(jié)構(gòu)，有些系統(tǒng)將控制網(wǎng)絡(luò)和操作管理網(wǎng)絡(luò)合并為一個網(wǎng)絡(luò)，如西屋公司的OVATION、FOXBORO公司的I／A和MCS公司的MAXl000+。需要說明的是，圖1只是示意圖，各層網(wǎng)絡(luò)拓撲結(jié)構(gòu)可以是環(huán)型、總線型和星型任何一種。
在DCS通訊系統(tǒng)分層結(jié)構(gòu)中，現(xiàn)場總線層用于連接現(xiàn)場智能儀表，遠程總線則用于連接遠程I／O機柜，控制網(wǎng)絡(luò)層主要用于各控制器和過程數(shù)據(jù)服務(wù)器之間的通訊，操作管理網(wǎng)絡(luò)層用于操作員站、工程師站和過程數(shù)據(jù)服務(wù)器之間的通訊。至于全廠信息管理層（MIS）則主要用于全廠的生產(chǎn)管理、優(yōu)化調(diào)度和人事管理等。由于MIS網(wǎng)一般都不采取冗余配置，并且相對布線復(fù)雜，可靠性相對較低，因此目前電廠自動化專家提議在操作網(wǎng)絡(luò)和MIS網(wǎng)之間再增設(shè)一個實時監(jiān)控信息網(wǎng)（SIs），專用于掛接廠級公用系統(tǒng)、各機組DCS系統(tǒng)和負荷分配站等，以用于多機組的實時監(jiān)控和優(yōu)化調(diào)度。除此之外，各自動化機柜內(nèi)也有內(nèi)部通訊網(wǎng)絡(luò)，不同系統(tǒng)差別較大，但一般都采用確定性的主從式通訊網(wǎng)絡(luò)或者令牌通訊網(wǎng)絡(luò)，這里就不再討論。
考慮到大多數(shù)數(shù)據(jù)都只需要在底層網(wǎng)絡(luò)中傳輸，只有少數(shù)需要通過上層網(wǎng)絡(luò)進行跨網(wǎng)絡(luò)傳輸，因此，將整個通訊系統(tǒng)合理分層后，一方面可以合理隔離各層的網(wǎng)絡(luò)通訊量，有利于提高各層通訊的實時性，另一方面也有利于網(wǎng)絡(luò)的可靠性，通過分層可以有效隔離各層網(wǎng)絡(luò)通訊故障，例如操作管理網(wǎng)絡(luò)的故障不會波及到控制網(wǎng)絡(luò)的正常運行。采用分層結(jié)構(gòu)還有一個優(yōu)點，那就是DCS廠商可以根據(jù)需要選擇合理的網(wǎng)絡(luò)拓撲結(jié)構(gòu)和通訊協(xié)議，在滿足整個通訊系統(tǒng)實時性和可靠性的基礎(chǔ)上最大限度地降低成本，從而提高整個系統(tǒng)的競爭力，例如在圖1操作網(wǎng)絡(luò)層通過采用流行的標(biāo)準(zhǔn)工業(yè)以太網(wǎng)結(jié)構(gòu)和TCP／IP通訊協(xié)議，有效提高了系統(tǒng)的開放性，與此同時，由于以太網(wǎng)非常便宜，因此使整體成本有效降低。需要注意的是，在這種分層體系中，連接不同網(wǎng)絡(luò)之間的通訊裝置的可靠性就成為一個關(guān)鍵因素，在可能的情況下選用高質(zhì)量的標(biāo)準(zhǔn)網(wǎng)關(guān)?！?/span>
2．通過分段進一步提高通訊效率
由于以太網(wǎng)在重負荷下的低效率，應(yīng)特別注意有效降低以太網(wǎng)的通訊負荷，尤其是在控制層使用以太網(wǎng)結(jié)構(gòu)時。與控制網(wǎng)絡(luò)相比，雖然操作層網(wǎng)絡(luò)的實時性要求要低得多（一般來講，由于人的視覺影響，操作畫面數(shù)據(jù)刷新速度不宜高于1秒，否則操作人員容易疲勞），但是以太網(wǎng)由于具有傳輸不確定性的固有缺點，有效降低其通訊負荷總是有益的，為此可以采用三種辦法，首先是采用更高速的以太網(wǎng)，譬如100Mbps快速以太網(wǎng)；其二是采用交換式以太網(wǎng)代替共享式以太網(wǎng)，以避免碰撞域，從而提高傳輸效率，典型代表就是MCS公司的MAX1000+系統(tǒng)；其三就是采用合理分段技術(shù)。這三種方法都各有其特點，在現(xiàn)有DCS中都得到了體現(xiàn)，鑒于前兩種方法大家已經(jīng)熟悉，這里就不再贅述，這里只簡單討論了第三種情況。
由于圖]所示分層網(wǎng)絡(luò)體系中一般都采用了雙服務(wù)器和多操作員站的配置，因此可以將操作管理網(wǎng)絡(luò)人為劃分為兩個相對獨立的以太網(wǎng)，兩個網(wǎng)絡(luò)通過網(wǎng)橋連接，兩個服務(wù)器分別掛接在兩個以太網(wǎng)上，而操作員站則平分在兩個網(wǎng)絡(luò)上，例如目前一般一套機組DCS配有5個操作員站，因此可以按2、3分布，如圖2所示。這樣，在正常情況下，每個服務(wù)器都只服務(wù)與各自對應(yīng)的操作員站，從而減少了網(wǎng)絡(luò)傳輸負荷和服務(wù)器負荷，可以顯著提高系統(tǒng)的響應(yīng)速度度。如果出現(xiàn)異常情況，譬如一臺服務(wù)器癱瘓，那么通過網(wǎng)橋兩個以太網(wǎng)又成為一個整體，此時工作的服務(wù)器同時服務(wù)于所有操作員站，此時雖然響應(yīng)速度稍微慢一些，但是完全不影響正常使用。采用這種方法不僅充分利用了兩臺服務(wù)器，而且只增加一個網(wǎng)橋的情況下就可以明顯改變系統(tǒng)響應(yīng)速度，因此是一種“低投入，高回報”的解決方案。根據(jù)作者的了解，目前貝利公司的SYMPHONY、ABB公司的PROCONTROI。P和日立公司的HIACS5000+都采用了該措施。
采用上述方案后，操作管理網(wǎng)絡(luò)的通訊效率和可靠性都得到了較大提升。其實類似的分段措施在控制網(wǎng)絡(luò)層也有使用，最典型的就是在日立公司HIACS3000／5000系統(tǒng)和FOXBORO公司的I/ASeries系統(tǒng)，其示意圖如圖3所示，此時控制層網(wǎng)絡(luò)按照系統(tǒng)劃分為燃燒系統(tǒng)、汽水系統(tǒng)和給水系統(tǒng)等。通過劃分，各個控制網(wǎng)絡(luò)段的通訊負荷有效降低，通訊實時性大大提高，可靠性也得到顯著改善。但是需要注意的是，采用這種方式時，控制網(wǎng)絡(luò)段的劃分和控制機柜的合理分布非常關(guān)鍵，在可能的情況下，將數(shù)據(jù)交換頻繁的控制機柜放在同一控制網(wǎng)絡(luò)段上可以大大改善通訊實時性。例如根據(jù)日立公司提供的相關(guān)資料，在日立HIACS3000／5000系統(tǒng)中，機柜內(nèi)數(shù)據(jù)傳輸周期為lOOms，而同一控制網(wǎng)絡(luò)上控制機柜數(shù)據(jù)交換需要200ms，如果需要在不同控制網(wǎng)絡(luò)上控制機柜之間交換數(shù)據(jù)則需要400ms時間。采用這種方式的潛在優(yōu)點就是可以更好地實現(xiàn)控制機柜的物理分散，因為控制網(wǎng)絡(luò)段可以根據(jù)需要加以靈活配置，這在FOXBORO公司的DCS實際應(yīng)用系統(tǒng)中得到了較好的體現(xiàn)。
GE FANUC IC600LR624 NSFP IC600LR624
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GSI AERIALS 229-352 USPP 229352
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HI SPEED 5D-01B-0008 USPP 5D01B0008
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METRA INSTRUMENTS 610-0001-001 USPP 6100001001
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MITSUBISHI A1-71SCPU USPP A171SCPU
MITSUBISHI A2A-CPU-R21 USPP A2ACPUR21
MITSUBISHI A2A-CPU-R21-S1 NSPP A2ACPUR21S1
MITSUBISHI A31TU NSFP A31TU
MITSUBISHI A3CPU-P21 USPP A3CPUP21
MITSUBISHI A8GT-70GOT-SW NSFP A8GT70GOTSW
MITSUBISHI AD51-E NSPP AD51E
MITSUBISHI FR-A240-7.5K-UL USPP FRA24075KUL
MITSUBISHI FR-A240E-1.5K NSFP FRA240E15K
MITSUBISHI FR-A540-2.2K-NA USPP FRA54022KNA
MITSUBISHI FR-RC-15-K NSFP FRRC15K
MITSUBISHI HCSF502BK NSFP HCSF502BK
MITSUBISHI HF354S-A51 NSFP HF354SA51
MITSUBISHI MR-S11-080-E01 USPP MRS11080E01
MODICON 029.087-643 USPP 029087643
MODICON 029.087-654 USPP 029087654
MODICON 110-CPU-612-04 USPP 110CPU61204
MODICON 140-ACI-040-00 NSFP 140ACI04000
MODICON 140-CPU-113-03 NSPP 140CPU11303
MODICON 140-NOM-212-00C NSFP 140NOM21200C
MODICON 372-ESS-474-01 NSFP 372ESS47401
MODICON 416-NHM-300-30 USPP 416NHM30030
MODICON 5136-MOD-ISA-V4 USPP 5136MODISAV4
MODICON AS-516P-006 NSPP AS516P006
MODICON AS-521P-009 USPP AS521P009
MODICON AS-B260-010 NSPP ASB260010
MODICON AS-BFRQ-254C USPP ASBFRQ254C
MODICON AS-C184-001 USPP ASC184001
MODICON AS-J474-000 NSFP ASJ474000
MODICON AS-J540-100 USPP ASJ540100
MODICON AS-P230-000 USPP ASP230000
MODICON AS-P453-642 USPP ASP453642
MODICON AS-P933-007 USPP ASP933007
MODICON MM-PMA1-30S NSPP MMPMA130S
MODICON MM-PMA140SC USPP MMPMA140SC
MODICON MM-PMC1-200 USPP MMPMC1200
MODICON NW-BM85-S485 NSFP NWBM85S485
MODICON NW-BP85-002 NSFP NWBP85002
MODICON PA-0521-000 NSFP PA0521000
MODICON PC-E984-258 USPP PCE984258
MOOG 152D453 USPP 152D453
MOOG 152J453 USPP 152J453
MOOG 152J-453A USPP 152J453A
MOOG 152J453A-3 USPP 152J453A3
MOOG CY1603B3 USPP CY1603B3
MOORE PRODUCTS 16133-71/01 USPP 161337101
MOORE PRODUCTS 16133-71/13 USPP 161337113
MOTOMAN ROBOTICS JANCD-I0O3E NSPP JANCDI0O3E
MOTOMAN ROBOTICS USASEM-01YRW11 USPP USASEM01YRW11
MOTOROLA MVME-162-510A USPP MVME162510A
MOTOROLA MVME-167-01B USPP MVME16701B
MOVOMATIC ERA-4662 USPP ERA4662
MTS SYSTEMS CO MPA-25-184 USPP MPA25184
NACHI MFA320FSCBS USPP MFA320FSCBS
NEMATRON CORP ICC-5L6-HS2 USPP ICC5L6HS2
NEMATRON CORP ICC-6L6-HS1 USPP ICC6L6HS1
NEMATRON CORP ICC-6L6-HS2 USPP ICC6L6HS2
NEMATRON CORP ICC-7L6-CNC USPP ICC7L6CNC
NEMATRON CORP ICC-7L6-HS1 USPP ICC7L6HS1
NEMATRON CORP IWS2023 USPP IWS2023
NEMATRON CORP IWS-2523 USPP IWS2523
NICOLET MAGNA-550 USPP MAGNA550
NUM MDLU-2021-N00N NSPP MDLU2021N00N
OHKURA ELECTRIC EC1103 USPP EC1103
OMRON 3F88M-116A USPP 3F88M116A
OMRON C2000H-CPU01 USPP C2000HCPU01
OMRON C2000H-CPU01-V1 USPP C2000HCPU01V1
OMRON C200HW-PCU01 NSPP C200HWPCU01
OMRON CS1W-MCH71 NSFP CS1WMCH71
OMRON CV500-BSC11 NSPP CV500BSC11
OMRON CV500-MC421 NSFP CV500MC421
OMRON CV500-RM211 NSFP CV500RM211
OMRON CVM1-CPU11-EV2 NSPP CVM1CPU11EV2
OMRON CVM1D-BI101 NSFP CVM1DBI101
OMRON F400-S1 USPP F400S1
OMRON NS10TV00B USPP NS10TV00B
OMRON NSJ10-TV01BG5D USPP NSJ10TV01BG5D
OMRON NT20M-DN131 USPP NT20MDN131
OMRON NT600S-ST121B-EV3 USPP NT600SST121BEV3
OMRON V720-D52P04-R4K NSPP V720D52P04R4K
OMRON Z4M-W40RA USPP Z4MW40RA
ORMEC MAC-B050C/K1A USPP MACB050CK1A
PANASONIC ADKB200BPFNCA USPP ADKB200BPFNCA
PANASONIC WJ-FS616 USPP WJFS616
PASAN BV67-3 NSPP BV673
PELCO DX7008-120 USPP DX7008120
PHD INC GRR-12-6-63X350-L9-V1 NSFP GRR12663X350L9V1
PILZ PSS3056 USPP PSS3056
PINNACLE SYSTEMS INC MGK-24-OF-AU USPP MGK24OFAU
PMI MOTION 00-J1644-007 USPP 00J1644007
POSITRON 600322/600313-R.3 USPP 600322600313R3
POWERTEC INDUSTRIAL MOTORS INC B18ASA11001000000 USPP B18ASA1100100000
POWERTEC INDUSTRIAL MOTORS INC C1.51.N4N1025 USPP C151N4N1025
POWERWARE CORP 101711105-002 USPP 101711105002
PPT VISION 661-0342-T10 NSPP 6610342T10
PRINTEK 90486 USPP 90486
QUAD TECH 78400 NSPP 78400
QUALIDYNE CORP LGSG24OVR82861 USPP LGSG24OVR82861
RAYCHEM TTB-IZA USPP TTBIZA
RELIANCE ELECTRIC 0-49005-4 USPP 0490054
RELIANCE ELECTRIC 0-49061 NSFP 049061
RELIANCE ELECTRIC 0-52806-01 NSFP 05280601
RELIANCE ELECTRIC 0-52806-1 NSFP 0528061
RELIANCE ELECTRIC 0-52808 NSFP 052808
RELIANCE ELECTRIC 0-54121-14R USPP 05412114R
RELIANCE ELECTRIC 0-54339-14 USPP 05433914
RELIANCE ELECTRIC 0-56305-1 USPP 0563051
RELIANCE ELECTRIC 0-56305-2 USPP 0563052
RELIANCE ELECTRIC 0-57406 NSFP 057406
RELIANCE ELECTRIC 086466-060V USPP 086466060V
RELIANCE ELECTRIC 14C-303 USPP 14C303
RELIANCE ELECTRIC 15FR7721 USPP 15FR7721
RELIANCE ELECTRIC 1KS586482-2Q USPP 1KS5864822Q
RELIANCE ELECTRIC 418285-113A USPP 418285113A
RELIANCE ELECTRIC 45C-204-A USPP 45C204A
RELIANCE ELECTRIC 45C-207 USPP 45C207
RELIANCE ELECTRIC 45C-20A USPP 45C20A
RELIANCE ELECTRIC 45C-312 USPP 45C312
RELIANCE ELECTRIC 45C-362 USPP 45C362
RELIANCE ELECTRIC 45C-364 USPP 45C364
RELIANCE ELECTRIC 45C-380 NSPP 45C380
RELIANCE ELECTRIC 57C-430A USPP 57C430A
RELIANCE ELECTRIC 57C-430B USPP 57C430B
RELIANCE ELECTRIC 57C-441 USPP 57C441
RELIANCE ELECTRIC 6SP401-027CTAN NSFP 6SP401027CTAN
RELIANCE ELECTRIC 73EV102004 USPP 73EV102004
RELIANCE ELECTRIC 78094-33R USPP 7809433R
RELIANCE ELECTRIC 801429-RE USPP 801429RE
RELIANCE ELECTRIC 804.12.04/BRR NSPP 8041204BRR
RELIANCE ELECTRIC 86466-60V USPP 8646660V
RELIANCE ELECTRIC 86466-91SC NSPP 8646691SC
RELIANCE ELECTRIC 86467-1R NSFP 864671R
RELIANCE ELECTRIC DDS-LPS NSPP DDSLPS
RELIANCE ELECTRIC PSM50ES USPP PSM50ES
RELIANCE ELECTRIC T18R1312D-QL USPP T18R1312DQL
RELIANCE ELECTRIC T18R1312M-KC USPP T18R1312MKC
RELIANCE ELECTRIC T18R1312M-QU USPP T18R1312MQU
Returns: Accepted within 7 days
REXROTH 4WRSE-6-V00-31/G24K0/A1VR-165 USPP 4WRSE6V0031G24K0
REXROTH 4WRSE-6-V04-31/G24K0/A1V USPP 4WRSE6V0431G24K0
REXROTH VMA-21/KR001-D USPP VMA21KR001D
REXROTH VTS0950-1X/2S-D-1-CL-WRD-16-V200-4X/10L2 USPP VTS09501X2SD1CLW
RIETSCHLE SGP-16-02 NSPP SGP1602
RITTAL 3281.100 USPP 3281100
RITTAL 3383.110 USPP 3383110
RONDO MOTOR CONTROL AADM6551A USPP AADM6551A
RUSSELL STOLL ERSFA3124FAA NSFP ERSFA3124FAA
RVSI ACUITY CIMATRIX HE1515HD NSFP HE1515HD
SAFTRONICS CIMR-G3U4015 USPP CIMRG3U4015
SANYO DENKI MC1K-U150 USPP MC1KU150
SANYO DENKI P60B13150HCX23 USPP P60B13150HCX23
SANYO DENKI P60B13200LCX2C USPP P60B13200LCX2C
SCHLUMBERGER DM2100-8130 NSPP DM21008130
SEW EURODRIVE MAS51A-030-503-00 USPP MAS51A03050300
SEW EURODRIVE MAS51A030-503-50 USPP MAS51A03050350
SEW EURODRIVE MDF60A0015-5A3-4-00 USPP MDF60A00155A3400
SEW EURODRIVE MDF60A0030-5A3-4-00 USPP MDF60A00305A3400
SEW EURODRIVE MDS60A0040-5A3-4-00 USPP MDS60A00405A3400
SEW EURODRIVE MDS60A-0075-5A3-4-06 USPP MDS60A00755A3406
SEW EURODRIVE MDV60A-0110-5A3-4-00 USPP MDV60A01105A3400
SEW EURODRIVE MF121A/MM03C USPP MF121AMM03C
SEW EURODRIVE MKS-51A005-503-00 USPP MKS51A00550300
SEW EURODRIVE MKS51A015-503-00 USPP MKS51A01550300
SEW EURODRIVE MKS51A015-503-50 USPP MKS51A01550350
SICK OPTIC ELECTRONIC DME3000-111 USPP DME3000111
SICK OPTIC ELECTRONIC DME-3000-111P USPP DME3000111P
SICK OPTIC ELECTRONIC LUT1-520 NSFP LUT1520
SICK OPTIC ELECTRONIC LVU-706-2221 USPP LVU7062221
SIEB & MEYER SM0263922GC USPP SM0263922GC
SIEB & MEYER SM026396BC NSPP SM026396BC
SIEMENS 1FK7060-5AH71-1GU3-Z.A73 NSFP 1FK70605AH711GU3
SIEMENS 1FK7100-5AF71-1EB0 NSFP 1FK71005AF711EB0
SIEMENS 1FT5062-0AC01-1-Z NSFP 1FT50620AC011Z
SIEMENS 1FT5066-0AF01-2-Z USPP 1FT50660AF012Z
SIEMENS 1FT5074-0AF71-1-Z USPP 1FT50740AF711Z
SIEMENS 1FT6082-1AF71-1AH1 NSFP 1FT60821AF711AH1
SIEMENS 1FT6082-1AF71-4EH1 USPP 1FT60821AF714EH1
SIEMENS 1FT7084-1AF70-1DG1 NSFP 1FT70841AF701DG1
SIEMENS 3TF5622-0AG2 USPP 3TF56220AG2
SIEMENS 3TF5-622-0XF0 USPP 3TF56220XF0
SIEMENS 6AP1-124-4EX8-80BH0 USPP 6AP11244EX880BH0
SIEMENS 6AU1810-0BA32-1XA0 NSFP 6AU18100BA321XA0
SIEMENS 6AV5-030-1DL20-0AC0 USPP 6AV50301DL200AC0
SIEMENS 6AV6-545-0CA10-0AX0 USPP 6AV65450CA100AX0
SIEMENS 6AW5-463-0AB USPP 6AW54630AB
SIEMENS 6AW5-563-0AB USPP 6AW55630AB
SIEMENS 6DD2920-0AR1 NSPP 6DD29200AR1
SIEMENS 6DS1326-8BB USPP 6DS13268BB
SIEMENS 6ES5-095-8MA03 NSPP 6ES50958MA03
SIEMENS 6ES5-095-8MD02 NSPP 6ES50958MD02
SIEMENS 6ES5-135-3UA11 USPP 6ES51353UA11
SIEMENS 6ES5-188-3UA21 USPP 6ES51883UA21
SIEMENS 6ES5-243-1AA12 USPP 6ES52431AA12
SIEMENS 6ES5-245-1AA12 USPP 6ES52451AA12
SIEMENS 6ES5-456-4UB12 NSFP 6ES54564UB12
SIEMENS 6ES5-460-7LA13 NSFP 6ES54607LA13
SIEMENS 6ES5-511-5AA12 NSFP 6ES55115AA12
SIEMENS 6ES5-926-3SA12 USPP 6ES59263SA12
SIEMENS 6ES7-314-5AE10-0AB0 USPP 6ES73145AE100AB0
SIEMENS 6ES7-314-6CF01-0AB0 NSFP 6ES73146CF010AB0
SIEMENS 6ES7-315-2EG10-0AB0 NSPP 6ES73152EG100AB0
SIEMENS 6ES7-317-2EJ10-0AB0 USPP 6ES73172EJ100AB0
SIEMENS 6ES7810-5CC11-0YA5 NSFP 6ES78105CC110YA5
SIEMENS 6ES7-840-0CC03-0YE0 FNFP 6ES78400CC030YE0
SIEMENS 6GT2001-0CA10 FNFP 6GT20010CA10
SIEMENS 6GT2002-2EE00 NSFP 6GT20022EE00
SIEMENS 6QG3-234-4EB00 USPP 6QG32344EB00
SIEMENS 6RA2-225-6DV62-ZF02 NSPP 6RA22256DV62ZF02
SIEMENS 6RA2610-6DU30-0A USPP 6RA26106DU300A
SIEMENS 6RA2616-6DU30-0 USPP 6RA26166DU300
SIEMENS 6RA2622-6DU30-0 USPP 6RA26226DU300
SIEMENS 6RA2625-6DW30-0 USPP 6RA26256DW300
SIEMENS 6RA2625-6DW30-1A USPP 6RA26256DW301A
SIEMENS 6RA2628-6DU30-1A USPP 6RA26286DU301A
SIEMENS 6RA7025-6FS22-0-Z NSPP 6RA70256FS220Z
SIEMENS 6RA8-232-1DB0 NSFP 6RA82321DB0
SIEMENS 6RB2100-0NA21 USPP 6RB21000NA21
SIEMENS 6SC6-100-0GA00 USPP 6SC61000GA00
SIEMENS 6SC9816-0AA02 USPP 6SC98160AA02
SIEMENS 6SE2117-3AA21 USPP 6SE21173AA21
SIEMENS 6SE3-123-0DH40 NSFP 6SE31230DH40
SIEMENS 6SE7-018-0TA61 USPP 6SE70180TA61
SIEMENS 6SE7-021-0TP50 NSFP 6SE70210TP50
SIEMENS 6SE7021-5UB61 NSPP 6SE70215UB61
SIEMENS 6SE7-021-8TB51 NSFP 6SE70218TB51
SIEMENS 6SE7-031-6ES87-2DC0 USPP 6SE70316ES872DC0
SIEMENS 6SE9112-6CA13 USPP 6SE91126CA13
SIEMENS 6SE9-212-8BA40 NSFP 6SE92128BA40
SIEMENS 6SE9-216-8CB40 USPP 6SE92168CB40
SIEMENS 6SL3000-1BE31-3AA0 NSFP 6SL30001BE313AA0
SIEMENS 6SN2703-3AA10-0BA1 USPP 6SN27033AA100BA1
SIEMENS A5E00248502/14 USPP A5E0024850214
SIEMENS MM5 NSFP MM5
SLAUGHTER CO A103/245 USPP A103245
SOCOMEC 48200101 USPP 48200101
SOLA ELECTRIC 63-23-720-8 USPP 63237208
SOLARTRON 79409501-C USPP 79409501C
SPRECHER & SCHUH PESC-146-240V NSFP PESC146240V
SQUARE D 3080-SMS-121 NSFP 3080SMS121
SQUARE D 3080-SMS3000 NSFP 3080SMS3000
SQUARE D 8539-SDR43-V06 USPP 8539SDR43V06
SQUARE D 8810-UBG1-V02S NSPP 8810UBG1V02S
SQUARE D 8903-SVO11-V02 USPP 8903SVO11V02
SQUARE D 9070-SK500A3D1 NSFP 9070SK500A3D1
SQUARE D 9070-T5000D5 NSFP 9070T5000D5
SQUARE D ATV-56U90N4 USPP ATV56U90N4
SQUARE D CKAD36008SA2DEDO NSFP CKAD36008SA2DEDO
SQUARE D CP2308G4STM NSPP CP2308G4STM
SQUARE D H363AWA NSFP H363AWA
SQUARE D HU662RWK USPP HU662RWK
SQUARE D LAF3640032MV1027 NSFP LAF3640032MV1027
SQUARE D LCL36500 NSFP LCL36500
SQUARE D MHL361000 USPP MHL361000
SQUARE D NQOD430M-SPL NSPP NQOD430MSPL
SQUARE D RC12V120 USPP RC12V120
STROMBERG SAFT-163-IOC USPP SAFT163IOC
STRUTHERS DUNN DIRECTOR 4000 75P14 USPP 75P14
STRUTHERS DUNN DIRECTOR 4000 75P74 USPP 75P74
STRUTHERS DUNN DIRECTOR 4000 75P75 USPP 75P75
STRUTHERS DUNN DIRECTOR 4000 76736-32 USPP 7673632
SWEO ENGINEERING 614-510-170 NSPP 614510170
SYMAX 8010-SFI-323 USPP 8010SFI323
SYMAX 8010-SFI-610 USPP 8010SFI610
SYMAX 8010-SPR-250 USPP 8010SPR250
SYMAX 8020-SCP-423 USPP 8020SCP423
SYMAX 8020-SCP-452 USPP 8020SCP452
SYMAX 8030-CRM-512 NSFP 8030CRM512
SYMAX 8030-RIM-731 USPP 8030RIM731
TAYLOR ELECTRONICS 6024BZ10100A USPP 6024BZ10100A
TAYLOR ELECTRONICS 6226BZ10000C USPP 6226BZ10000C
TB WOODS WFC-2020-OCHT USPP WFC2020OCHT
TB WOODS WFC4010-0CHT USPP WFC40100CHT
TB WOODS X2C4015-0B NSFP X2C40150B
TCI 307505640-002 USPP 307505640002
TECH MOTIVE TOOL 49-4100-02C5 USPP 49410002C5
TELEMECANIQUE ATV-28HD23N4U NSFP ATV28HD23N4U
TELEMECANIQUE TSX-172-3444 USPP TSX1723444
TELEMECANIQUE TSX-SCM-2222 USPP TSXSCM2222
TELEMECANIQUE XBT-F03-23-10 USPP XBTF032310
TEXAS INSTRUMENTS PLC 500-5023 NSFP 5005023
TEXAS INSTRUMENTS PLC 500-5053 USPP 5005053
TEXAS INSTRUMENTS PLC 500-7201 USPP 5007201
TEXAS INSTRUMENTS PLC 500-7203 USPP 5007203
TEXAS INSTRUMENTS PLC 500-7204 USPP 5007204
TEXAS INSTRUMENTS PLC 505-2557 NSFP 5052557
TEXAS INSTRUMENTS PLC 505-ATM-0220 USPP 505ATM0220
TEXAS INSTRUMENTS PLC 560-2128 USPP 5602128
TEXAS INSTRUMENTS PLC 560-2820 USPP 5602820
TEXAS INSTRUMENTS PLC PC-505-6201 NSFP PC5056201
TEXAS INSTRUMENTS PLC RTU-8635-SSD NSFP RTU8635SSD
TOKYO SEIMITSU E-PU2171A USPP EPU2171A
TORQ GARD TGC-400 USPP TGC400
TOSHIBA VT130G204110 NSPP VT130G204110
TOSHIBA VT130G304110 USPP VT130G304110
TOSHIBA VT130H1U-4110B0 USPP VT130H1U4110B0
TOTAL CONTROL PRODUCTS OC250-DEM-001 USPP OC250DEM001
TOTAL CONTROL PRODUCTS QM1104ROA-D USPP QM1104ROAD
TOTAL CONTROL PRODUCTS QPL-CO2 USPP QPLCO2
TRICONEX 3002 USPP 3002
TRIDENT SCA-SS-70-10 NSFP SCASS7010
TRUETRACE 1110-01 USPP 111001
UNITEK MIYACHI HFIC/460 USPP HFIC460
UNITEK MIYACHI HFIC/AS/460 USPP HFICAS460
USON CORP 407-X300A USPP 407X300A
VAT 48124-CE24-AAF1 NSFP 48124CE24AAF1
VIBRO METER MPC-4 NSPP MPC4
VICKERS FAT-3-M6-010-00-02-18 USPP FAT3M6010000218
VIEWTRONIX IC1210 USPP IC1210
VXI ELECTRONICS 1261B USPP 1261B
WESTINGHOUSE 289B142A09 USPP 289B142A09
WESTINGHOUSE 289B142A15 USPP 289B142A15
WESTINGHOUSE 289B142A21 USPP 289B142A21
WESTINGHOUSE 289B142A25 USPP 289B142A25
WESTINGHOUSE 293B307A12 USPP 293B307A12
WESTINGHOUSE A200M4CACD USPP A200M4CACD
WESTINGHOUSE HJD3250 USPP HJD3250
WESTINGHOUSE LA3600 USPP LA3600
WESTINGHOUSE PC-1100-1033 USPP PC11001033
WESTINGHOUSE PC-1200-1041 USPP PC12001041
WHEDCO 78004657 USPP 78004657
WHEDCO IMC-3161-2-B USPP IMC31612B
WINDSOR MPMA5/1 USPP MPMA51
WINSMITH 6CB USPP 6CB
XOMOX CORPORATION J07380 NSPP J07380
XYCOM 2060 USPP 2060
XYCOM 9460-0103040011006 NSPP 9460010304001100
XYCOM 9462-0133140011004 USPP 9462013314001100
XYCOM 97011 USPP 97011
XYCOM XVME-674 USPP XVME674
YAMADA PUMP DP20-F USPP DP20F
YAMATAKE 30733157-001 NSPP 30733157001
YAMATAKE 80360300-001 USPP 80360300001
YASKAWA ELECTRIC CACR-HR30UB USPP CACRHR30UB
YASKAWA ELECTRIC CACR-SR10BB1AF USPP CACRSR10BB1AF
YASKAWA ELECTRIC CACR-SR15-BB1AF USPP CACRSR15BB1AF
YASKAWA ELECTRIC CACR-SR60BY1SDY50 USPP CACRSR60BY1SDY50
YASKAWA ELECTRIC JANCD-FC200-2 USPP JANCDFC2002
YASKAWA ELECTRIC JZNC-TB24L USPP JZNCTB24L
YASKAWA ELECTRIC NPSO-1303L USPP NPSO1303L
YASKAWA ELECTRIC USAFED-13FS2 USPP USAFED13FS2
YASKAWA ELECTRIC USASEM-15AF1 USPP USASEM15AF1
YORK FK11-STD USPP FK11STD
ZELLWEIGER ANALYTICS POLYMETRON-8811 USPP POLYMETRON8811
