J-DIM00

主要由系统内部元器件及电路间的相互电磁辐射产生，如逻辑电路相互辐射及其对模拟电路的影响，模拟地与逻辑地的相互影响及元器件间的相互不匹配使用等。这都属于PLC制造厂对系统内部进行电磁兼容设计的内容，比较复杂，作为应用部门是无法改变，可不必过多考虑，但要选择具有较多应用实绩或经过考验的系统。为了保证系统在工业电磁环境中免受或减少内外电磁干扰，必须从设计阶段开始便采取三个方面抑制措施：抑制干扰源；切断或衰减电磁干扰的传播途径；提高装置和系统的抗干扰能力。这三点就是抑制电磁干扰的基本原则。 PLC控制系统的抗干扰是一个系统工程，要求制造单位设计生产出具有较强抗干扰能力的产品，且有赖于使用部门在工程设计、安装施工和运行维护中予以全面考虑，并结合具有情况进行综合设计，才能保证系统的电磁兼容性和运行可靠性。进行具体工程的抗干扰设计时，应主要以下两个方面。在选择设备时，首先要选择有较高抗干扰能力的产品，其包括了电磁兼容性（EMC），尤其是抗外部干扰能力，如采用浮地技术、隔离性能好的PLC系统；其次还应了解生产厂给出的抗干扰指标，如共模拟制比、差模拟制比，耐压能力、允许在多大电场强度和多高频率的磁场强度环境中工作；另外是靠考查其在类似工作中的应用实绩。在选择国外进口产品要注意：我国是采用220V高内阻电网制式，而欧美地区是110V低内阻电网。由于我国电网内阻大，零点电位漂移大，地电位变化大，工业企业现场的电磁干扰至少要比欧美地区高4倍以上，对系统抗干扰性能要求更高，在国外能正常工作的PLC产品在国内工业就不一定能可靠运行，这就要在采用国外产品时，按我国的标准（GB/T13926）合理选择。 主要考虑来自系统外部的几种如果抑制措施。主要内容包括：对PLC系统及外引线进行屏蔽以防空间辐射电磁干扰；对外引线进行隔离、滤波，特别是原理动力电缆，分层布置，以防通过外引线引入传导电磁干扰；正确设计接地点和接地装置，完善接地系统。另外还必须利用软件手段，进一步提高系统的安全可靠性。

NetApp FAS6070-A Cluster 25.2TB 4 MK4s 56 450GB 15k FC

NetApp FAS6030-A 24.2TB Cluster w/ 56 450GB 15K FC

Netapp Lot (20) DS14MK2-AT w/14x 1 TB X269A-R5 SATA

Netapp FAS6030C w/48x DS14MK2 300GB X267A-R5 201TB!!

NetApp FAS3050C 10 Transferable Licenses 168TB X269A-R5

Rack NetApp 14x DS14MK4 w/14x 300GB 15K X279A-R5 58.8TB

Rack NetApp 14x DS14MK4 w/14x 300GB 15K X279A-R5 58.8TB

Rack NetApp 14x DS14MK4 w/14x 300GB 15K X279A-R5 58.8TB

NetApp FAS3020C 10 Transferable Licenses 168TB X269A-R5

Full Rack Netapp 14x DS14MK2AT 1TB X269A-R5 168TB!!

NetApp FAS3050C CIFS NFS ISCSI Multistore DSANIT X279A

Full Netapp Rack w/PDUs 14x DS14MK2-AT w/14x X269A 1TB

NetApp FAS3050C CIFS NFS ISCSI DSANIT FCP 50TB 4gbps

NetApp FAS3070C w/12x DS14MK2-AT 14x 1TB X269A-R5 168TB

Netapp FAS6070 w/12x DS14MK2-AT 1TB X269A-R5 168TB!!!!!

Netapp FAS6030C 24x DS14MK2AT 750GB X268A 252TB FAS6030

Netapp FAS6030C w/48x DS14MK2-AT 500GB 336TB!!! FAS6030

NetApp FAS3050C w/12x DS14MK2-AT (14) X269A-R5 1TB Disk

Netapp FAS6030 w/12x DS14MK2-AT 1TB X269A-R5 168TB!!!!

NetApp FAS3020C w/12x DS14MK2-AT (14) X269A-R5 1TB Disk

Netapp FAS3140 w/9x DS4243 (24) X302A-R5 216TB SATA!!!!

NetApp DS4243-0748-24A​-QS-R5 48TB DS4243 Disk Shelf

NetApp FAS6070 Filer System Head Refurbished

Netapp Lot (10) DS14MK2-AT w/14x 1 TB X269A-R5 SATA

Netapp FAS6030C 24x DS14MK2 300GB X276A 100TB FAS6030

NetApp FAS3070-A Cluster 17TB 112x 144GB FC 10K REF

NetApp DS4243 Shelf w/ (24) X411A-R5 450GB 15K SAS HDs

NetApp FAS3050C 10 Transferable Licenses MK4 24TB 15K!!

NetApp FAS3020C 10 Transferable Licenses 24TB MK4 X278A

NetApp FAS3050C 10 Transferable Licenses 24TB MK4 X278A

NetApp FAS3050C CIFS NFS ISCSI CLUSTER 24TB DS14MK4

NetApp FAS3070-A Cluster 28TB 56 500GB SATA 7.2K

NetApp FAS3020C 6 Transferable Licenses 24TB X278A MK4

Netapp FAS3020C 6 Transferable Licenses 24TB!! DS14MK4

NetApp FAS3020C 6 Transferable Licenses 24TB MK4 4gbps

NetApp FAS3020C 6 Transferable Licenses 24TB X278A MK4

NetApp FAS3050C NFS ISCSI Flexclone Cluster 24TB X278A

Netapp FAS3050C NFS ISCSI Flexclone Cluster 24TB 4gbps

NetApp FAS3050C 6 Transferable Licenses 24TB MK4 X278A

NetApp FAS3050C NFS ISCSI Flexclone Cluster 24TB X278A

NetApp FAS3020C 4 Transferable Licenses 24TB DS14MK4 _

NetApp FAS3020C 4 Transferable Licenses 24TB MK4 X278A

NetApp FAS3020C 4 Transferable Licenses 24TB MK4 X278A

NetApp FAS3050C Transferable Licenses w/24TB MK4 X278A

Netapp FAS6030C w/24x DS14MK2-AT 500GB 168TB!!! FAS6030

Netapp FAS3070C 12x DSX-10.5TB-QS-R​5 126TB!! FAS3070

NetApp FAS3070C w/12x DS14MK2-AT 750GB X268A-R5 126TB!!

NETAPP FAS3050 6x DS14MK4 300GB 15K X279A-R5 25TB @@@@

NetApp FAS3050C 7 Transferable Licenses 24TB MK4 X278A

NetApp FAS3020C w/10 Transferable Licenses 84TB!! X267A

NetApp FAS3050C w/10 Transferable Licenses 84TB!! X267A

NetApp FAS3050C CIFS NFS ISCSI SV-ontap-PRI 84TB!!!

NetApp FAS3020-HA-C 42TB System w/ 84x 500GB SATA

Netapp FAS6070 w/12x DS14MK2-AT 750GB X268A-R5 126TB!!

NetApp FAS3050c NFS ISCSI CLUSTER FCP DSX-7.0TB-QS-R5

NetApp FAS3050c 12x DSX-7.0TB-QS-R5 84TB!! w/ LICENSES

NetApp FAS3050c 12x DS14MK2-AT X267A 84TB! w/ LICENSES

NetApp FAS3050c 12x DS14MK2 AT X267A 84TB! w/ LICENSES

NetApp FAS3050c NFS, ISCSI, CLUSTER, FCP 84TB of Disk!!

NetApp FAS3050c w/ NFS, ISCSI, CLUSTER, FCP w/84TB!!!

NetApp FAS3050c Transferable Licenses 84TB! 168x X267A

NetApp FAS3050c 12 DS14MK2-AT X267A-R5 84.0TB TOTAL!!!!

NetApp FAS3050c w/Licenses 12 DS14MK2-AT 500GB X267A-R5

NetApp FAS3050c Transfble Licenses 12x DSX-7.0TB-QS-R5

NetApp FAS3050c 12x DSX-7.0TB-QS-R5 84.0TB STORAGE!!

NetApp FAS3050c DSX-7.0TB-PBNDL​-R5 84.0 TERABYTES!!!!!

NetApp FAS3050c 12x DS14MK2-AT 168x 500GB SATA 84.0TB!

NetApp FAS3050c 12x DS14MK2AT X267A 84TB w/ LICENSES

Lot 100pcs Netapp X269A-R5 SP-269A-R5 108-00180 1TB

Netapp FAS6030 w/12x DS14MK2-AT 750GB X268A-R5 126TB!!

Netapp FAS6030C 24x DS14MK2 144GB 15K X275 48TB FAS6030

NetApp FAS3040C W/4 Transferable Licenses & 50TB of FC

NetApp FAS3040C ISCSI FCP CLUSTER SV-ontap-PRI 50TB FC

NetApp FAS3040C W/4 Transferable Licenses w/84TB SATA

NetApp FAS3040C 4 Transferable Licenses 24TB 4gpbs 15K

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NetApp FAS3020C 6 Transferable Licenses 84TB X267A Disk

NetApp FAS3050C CIFS NFS ISCSI SNAP MIRROR SNAP RESTORE

NetApp FAS3050C 6 Transferable Licenses 84TB!! X267A

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NetApp FAS3020C w/4 Transferable Licenses 84TB!! X267A

Qty 500 NETAPP 300GB 10K X276A FC for DS14MK2 DS14MK4

NetApp FAS3050C CIFS NFS ISCSI DSANIT FCP 50TB DS14MK2

NetApp FAS3050C w/7 Transferable Licenses & 50TB FC 10K

NetApp FAS3050C Transferable Licenses 84TB X267A Disk

NetApp DS4243 Shelf w/ (24) X410A-R5 300GB 15K SAS HDs

NetApp FAS3050C 10 Transferable Licenses MK4 24TB 15K!!

Rack NetApp 14 x DS14MK4 w/14x 300GB 10K x276a -58.8TB

Rack NetApp 14 x DS14MK4 w/14x 300GB 10K -58.8TB

NetApp DS4243-0724-12A​-QS-R5 24TB DS4243 Disk Shelf

NetApp X64015A-ESH4-R5​-C DS14MK4 Shelf w/ 14 600GB HDs

NetApp FAS3020C 10 Transferable Licenses 24TB 15K X275A

NetApp FAS3050C 10 Transferable Licenses 24TB 15K X275A

NetApp FAS6030 Filer System Head Refurbished

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Netapp FAS3050C CIFS CLUSTER ISCSI w/12x DS14MK2 50TB!!

Netapp Rack 14x DS14MK4 w/14x 144GB 15K X278A-R5 28.2TB

Netapp FAS3050C CIFS CLUSTER ISCSI 12x DS14MK2-AT 84TB!

Netapp Rack 14x DS14MK4 w/14x144GB 15K 4gbps X278A 28TB

Netapp FAS3050C CIFS CLUSTER ISCSI 12x DS14MK4 24TB 15K

Netapp Rack 14x DS14MK4 w/14x144GB 15K 4gbps X278A-R5 @

NetApp FAS3050C w/9 Transferable Licenses & 84TB SATA

NetApp FAS3050C CIFS NFS ISCSI SNAP MIRROR SNAP RESTORE

NetApp FAS3050C 6 Transferable Licenses 24TB 15K X275A

Netapp FAS3020C 6 Transferable Licenses 24TB DS14 MK4 @

NetApp FAS3020 42TB System 6x DS14 MK2 AT w/ 14x 500GB

NetApp DS4243 Shelf w/ (24) X302A-R5 1TB 7.5K SATA HDs

NetApp FAS3020C 4 Transferable Licenses 24TB 15K X275A

NetApp FAS3050C w/7 Transferable Licenses & 84TB SATA

NetApp FAS3050C Transferable Licenses w/24TB 15K X275A

NetApp FAS3020C 4 Transferable License 24TB MK4 X278A @

Netapp FAS3140 Filer w/3x DS4243 w/24x 1TB X302A-R5

Netapp FAS3140 with 72TB of Disk 3x DS4243 (24) X302A

NetApp FAS980c w/10x DS14MK2 14x 300GB 10K X276A

NetApp NetCache C3300 6x 144GB HD w/ DS14MK2 14x 144GB

Netapp Lot (5) DS14MK2-AT w/14x 1 TB X269A-R5 SATA

NetApp FAS3050C CIFS ISCSI CLUSTER MULTISTORE 24TB 15K

Network Appliance NETAPP FAS3040C with 8 Licenses

Dell, NetApp DS14MK2-AT FAS 3050 Storage System 56TB

Netapp FAS6070 HARDWARE ONLY

NetApp FAS940c w/10x DS14MK4 14x 144GB 15K X278A-R5

NetApp FAS3050C NFS ISCSI Flexclone Cluster w/24TB 15K

Netapp FAS6070 w/12x DS14MK4 144GB 15K X278A-R5 24TB!!

Netapp FAS6070 w/12x DS14MK2 300GB 10K X276A-R5 50TB

NetApp FAS3020C 10 Transferable Licenses 24TB 10K X274B

NetApp FAS3050C 10 Transferable Licenses 24TB 10K X274B

NetApp FAS3050C CIFS NFS ISCSI SNAP MOVE CLUSTER 24TB

Lot of 20 Netapp DS14 MK2 w/14x 300GB 10K X276A 84TB!!

Qty 20 Netapp DS14 MK2 w/14x 300GB 10K X276A 84TB!!

Netapp FAS3070C 12x DSX-7.0TB-QS-R5 84TB!! FAS3070

NetApp FAS3070C w/12x DS14MK2AT 500GB X267A-R5 84TB!!

NetApp FAS3070C w/12x DS14MK2 144GB X275A-R5 15K 24TB!!

Netapp FAS6030 w/12x DS14MK2 300GB 10K X276A-R5 50TB

Netapp FAS6030 w/12x DS14MK4 144GB 15K X278A-R5 24TB!!

NetApp FAS3020C 6 Transferable Licenses 12x MK2 24TB!!

NetApp FAS3020C 6 Transferable Licenses 24TB 10K X274B

Netapp FAS3020 6x DS14MK4 24TB Transferable Licenses

NetApp FAS3020C 6 Transferable Licenses 24TB 10K X274B

NetApp NetCache C3300 w/ (6) 144GB Disk Drives

专业销售进口DCS  PLC系统备件模块