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1.分层结构的优缺点
经过大量分析发现，基于开放性、可靠性和传输实时性考虑，目前各DCS系统的通讯网络毫无例外地采用分层结构，过程采集数据上传，控制数据下传，不同层次的通讯网络可以根据实际需要采用不同的拓扑结构和不同的通讯协议，各个层次的相互配合共同构成整体通讯体系。从目前来看，各DCS系统一般存在有车间级的现场总线通讯网络或者远程通讯网络、电子设备间的控制网络和控制室内的操作管理网络，如图1所示，按此配置典型的系统有ABB公司的PROCONTROLP、西门子公司的TELEPERMXP、日立公司的HLACS5000、贝利公司的Svmphony和Honeywell公司的TDC3000。为了简化系统分层结构，有些系统将控制网络和操作管理网络合并为一个网络，如西屋公司的OVATION、FOXBORO公司的I／A和MCS公司的MAXl000+。需要说明的是，图1只是示意图，各层网络拓扑结构可以是环型、总线型和星型任何一种。
在DCS通讯系统分层结构中，现场总线层用于连接现场智能仪表，远程总线则用于连接远程I／O机柜，控制网络层主要用于各控制器和过程数据服务器之间的通讯，操作管理网络层用于操作员站、工程师站和过程数据服务器之间的通讯。至于全厂信息管理层（MIS）则主要用于全厂的生产管理、优化调度和人事管理等。由于MIS网一般都不采取冗余配置，并且相对布线复杂，可靠性相对较低，因此目前电厂自动化专家提议在操作网络和MIS网之间再增设一个实时监控信息网（SIs），专用于挂接厂级公用系统、各机组DCS系统和负荷分配站等，以用于多机组的实时监控和优化调度。除此之外，各自动化机柜内也有内部通讯网络，不同系统差别较大，但一般都采用确定性的主从式通讯网络或者令牌通讯网络，这里就不再讨论。
考虑到大多数数据都只需要在底层网络中传输，只有少数需要通过上层网络进行跨网络传输，因此，将整个通讯系统合理分层后，一方面可以合理隔离各层的网络通讯量，有利于提高各层通讯的实时性，另一方面也有利于网络的可靠性，通过分层可以有效隔离各层网络通讯故障，例如操作管理网络的故障不会波及到控制网络的正常运行。采用分层结构还有一个优点，那就是DCS厂商可以根据需要选择合理的网络拓扑结构和通讯协议，在满足整个通讯系统实时性和可靠性的基础上最大限度地降低成本，从而提高整个系统的竞争力，例如在图1操作网络层通过采用流行的标准工业以太网结构和TCP／IP通讯协议，有效提高了系统的开放性，与此同时，由于以太网非常便宜，因此使整体成本有效降低。需要注意的是，在这种分层体系中，连接不同网络之间的通讯装置的可靠性就成为一个关键因素，在可能的情况下选用高质量的标准网关。
2．通过分段进一步提高通讯效率
由于以太网在重负荷下的低效率，应特别注意有效降低以太网的通讯负荷，尤其是在控制层使用以太网结构时。与控制网络相比，虽然操作层网络的实时性要求要低得多（一般来讲，由于人的视觉影响，操作画面数据刷新速度不宜高于1秒，否则操作人员容易疲劳），但是以太网由于具有传输不确定性的固有缺点，有效降低其通讯负荷总是有益的，为此可以采用三种办法，首先是采用更高速的以太网，譬如100Mbps快速以太网；其二是采用交换式以太网代替共享式以太网，以避免碰撞域，从而提高传输效率，典型代表就是MCS公司的MAX1000+系统；其三就是采用合理分段技术。这三种方法都各有其特点，在现有DCS中都得到了体现，鉴于前两种方法大家已经熟悉，这里就不再赘述，这里只简单讨论了第三种情况。
由于图]所示分层网络体系中一般都采用了双服务器和多操作员站的配置，因此可以将操作管理网络人为划分为两个相对独立的以太网，两个网络通过网桥连接，两个服务器分别挂接在两个以太网上，而操作员站则平分在两个网络上，例如目前一般一套机组DCS配有5个操作员站，因此可以按2、3分布，如图2所示。这样，在正常情况下，每个服务器都只服务与各自对应的操作员站，从而减少了网络传输负荷和服务器负荷，可以显著提高系统的响应速度度。如果出现异常情况，譬如一台服务器瘫痪，那么通过网桥两个以太网又成为一个整体，此时工作的服务器同时服务于所有操作员站，此时虽然响应速度稍微慢一些，但是完全不影响正常使用。采用这种方法不仅充分利用了两台服务器，而且只增加一个网桥的情况下就可以明显改变系统响应速度，因此是一种“低投入，高回报”的解决方案。根据作者的了解，目前贝利公司的SYMPHONY、ABB公司的PROCONTROI。P和日立公司的HIACS5000+都采用了该措施。
采用上述方案后，操作管理网络的通讯效率和可靠性都得到了较大提升。其实类似的分段措施在控制网络层也有使用，最典型的就是在日立公司HIACS3000／5000系统和FOXBORO公司的I/ASeries系统，其示意图如图3所示，此时控制层网络按照系统划分为燃烧系统、汽水系统和给水系统等。通过划分，各个控制网络段的通讯负荷有效降低，通讯实时性大大提高，可靠性也得到显著改善。但是需要注意的是，采用这种方式时，控制网络段的划分和控制机柜的合理分布非常关键，在可能的情况下，将数据交换频繁的控制机柜放在同一控制网络段上可以大大改善通讯实时性。例如根据日立公司提供的相关资料，在日立HIACS3000／5000系统中，机柜内数据传输周期为lOOms，而同一控制网络上控制机柜数据交换需要200ms，如果需要在不同控制网络上控制机柜之间交换数据则需要400ms时间。采用这种方式的潜在优点就是可以更好地实现控制机柜的物理分散，因为控制网络段可以根据需要加以灵活配置，这在FOXBORO公司的DCS实际应用系统中得到了较好的体现。
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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
