3HAC-17484-3

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描述

3HAC-17484-3

为了确保整个系统能在安全状态下可靠工作，避免由于外部电源发生故障、PLC出现异常、误操作以及误输出造成的重大经济损失和人身伤亡事故，PLC外部应安装必要的保护电路。

    （1）急停电路。对于能使用户造成伤害的危险负载，除了在控制程序中加以考虑之外，还应设计外部紧急停车电路，使得PLC发生故障时，能将引起伤害的负载电源可靠切断。
    （2）保护电路。正反向运转等可逆操作的控制系统，要设置外部电器互锁保护；往复运行及升降移动的控制系统，要设置外部限位保护电路。
    （3）可编程控制器有监视定时器等自检功能，检查出异常时，输出全部关闭。但当可编程控制器CPU故障时就不能控制输出，因此，对于能使用户造成伤害的危险负载，为确保设备在安全状态下运行，需设计外电路加以防护。
    （4）电源过负荷的防护。如果PLC电源发生故障，中断时间少于10秒，PLC工作不受影响，若电源中断超过10秒或电源下降超过允许值，则PLC停止工作，所有的输出点均同时断开；当电源恢复时，若RUN输入接通，则操作自动进行。因此，对一些易过负载的输入设备应设置必要的限流保护电路。
    （5）重大故障的报警及防护。对于易发生重大事故的场所，为了确保控制系统在重大事故发生时仍可靠的报警及防护，应将与重大故障有联系的信号通过外电路输出，以使控制系统在安全状况下运行。

产品承诺：
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保 证 安全准时发货，
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主营DCS系统配件
机器人系统配件
大型伺服系统配件
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NetApp DS14MK2-AT 7TB w 14 X267A 500GB 7.2K SATA HD REF

NetApp F880 w/ (28) 144GB 4TB Network Appliance

NetApp FAS250 2TB Filer System

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NetApp FAS940 w/ (28) 144GB 10K 4TB Network Appliance

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Network Appliance NETAPP DS14MK4,14 X 300GB (x279a) 15K

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

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NetApp DS14MK4 Disk Shelf w/ 14x 300GB 15K FC 4.2TB

NetApp DS14MK4 14x 300GB 15K 4gb X279A-R5 4.2TB 4gbps!

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NetApp DS14MK4 X94015A-ESH4-R5​-C 14x 300GB 15K 4gpbs

NetApp DS14MK4 Disk Shelf 14x 300GB 15K FC X279A-R5 4gb

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NetApp DS14MK4 Shelf 14x 300GB 15K X279A 1 yr Warranty

NetApp DS14MK4 Shelf 14x 300GB 15K X279A-R5 4Gbps 4.2TB

NetApp DS14 MK4 Shelf 14x 300GB 15K FC X279A-R5 DS14MK4

NetApp DS14MK4 Shelf 14x 300GB 15K 4gbps X279A-R5 MK4

NetApp DS14MK4 X94015A-ESH4-R5​-C 14x 300GB 15K FC X279A

NetApp DS14MK4 Shelf 14x 300GB 15K 4gbps X279A-R5 MK4

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NetApp DS14 MK4 4.2TB 14x 300GB 15K FC X279A-R5 DS14MK4

NetApp DS14MK4 X94015A-ESH4-R5​-C 14x 300GB 15K FC ~

Netapp DS14MK4 14x 300GB 15K SP-279-R5 FC JBOD 4gpbs

NetApp DS14MK4 Shelf 14x 300GB 15K 4gbps X279A-R5 DS14

NetApp DS14 MK4 14x 300GB 15K X279A Fiber Channel Disk

NetApp DS14MK4 X94015A-ESH4-R5​-C 14x 300GB 15K FC X279A

NetApp DS14 MK4 14x 300GB 15K X279A-R5 4.2TB 4gpbs

NetApp FAS960 w/2x DS14MK2 14x 300GB 10K X276A 8.4TB!!

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NetApp DS14 MK4 Shelf w/ 14x 300GB 15K FC X279A DS14MK4

NetApp DS14MK4 X94015A-ESH4-QS​-R5 w/4.2Tb X279A-R5 15K

NetApp FAS940 Filer w/2x DS14MK2 14x 300GB 10K X276A

NetApp FAS940 w/2x DS14MK2 14x 300GB 10K X276A 8.4TB!!

NetApp SK-FAS980 Spares Kit for FAS980 System

NetApp 14TB DS14MK2-A-14.0T​B Shelf W/ 14x 1TB X269A-R5

NetApp C1200 NetCache C1200-Base 1U

NetApp F880 Filer Head Unit Network Appliance Net App

NetApp X3880C F880/R100 Motherboard Network Appliance

Lot 25 NetApp X268A-R5 SP-268A-R5 750GB SATA 108-00149

NetApp FAS3070 Filer – Ontap licenses also available

NetApp SK-F880 Spares Kit for F880 Filer

NetApp DS14MK2 AT shelf + 14x 1TB X269A + 2x AT-FCX

NetApp FAS270c Network Appliance Filer w/ 4TB 14 X X276

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NetApp FAS940 Filer w/2x DS14MK2-AT 14x 500GB 14TB!!!!

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NetApp FAS3050 Filer w/ DS14MK2 14x 144GB 15K X275A-R5

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Network Appliance NetApp FAS3070 Filer

NetApp FAS3050 Filer w/DS14MK2 14x 144GB 15K X275A-R5 !

NetApp DS14MK2 10.5TB 14x750GB SATA Disk Shelf 10.5TB

NetApp FAS3050 Filer DS14MK2 14x 144GB 15K X275A-R5 2TB

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NETAPP 10.5 TB UPGRADE X268A DS14MK2-AT DS14MK2

NetApp FAS3020 Filer w/DS14MK2 14x 300GB X276A-R5 4TB

NetApp DS14MK2-AT 4.5TB w/ 14 X266B 320GB 7.2K SATA HD

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NETAPP FAS6070 Filer Head Controller 1 YR WARRANTY!!!

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NetApp X3770A F840 Motherboard

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NetApp FAS270C Cluster w/14 X276A 300GB 10K FAS270

NetApp FAS940 Filer w/4x DS14MK2 14x 144GB 10K X274A

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NetApp F87 Filer Tower w/ 6x36GB – Network Appliance

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NetApp DS14 mk2 AT with 14x X268a-R5 750G SATA Drives

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NetApp FAS270c Network Appliance Filer w/ 2TB 14 x X274

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Netapp FAS2050C Cluster Filer Head Dual Controller

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NetApp SK-FAS960 Spares Kit for FAS960 System

NetApp X749A DC Power Supply Network Appliance

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NetApp SK-F840B Spares Kit for F840 Filer

NETAPP FAS3050c Cluster 2 Filer Heads FAS 3050 Disk

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NETAPP FAS3020C Cluster 2 Filer Heads FAS3020 Clustered

NetApp F825 Filer Head Unit

NetApp FAS3050 Filer DS14MK2 14x 144GB 10K X274A-R5 “

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NetApp 14 x 750gb MK2 AT Disk Shelf – X268, X268A disks

NetApp R200 NearStore Head Unit 6GB QLA2342 2X3GHz XEON

NetApp FAS3020 w/(2) Shelves of 300GB 10K FC Drives

NetApp NetCache C3300 6 X 72GB 15k FC

NetApp NetCache C3300 6 X 144GB 10K FC

NetApp C2100 NetCache Proxy Server w/ 7x 72GB HDD

NetApp NetCache C3300 6 X 72GB 15K FC

NetApp FAS270C with licenses and 2TB FC Storage

NetApp FAS2020, 111-00237 filer module, 12 x SAS144 146

NetApp R200 NearStore Head – ONTAP license options

NetApp FAS980 Filer – DataONTAP licenses also available

NetApp FAS3020C-R5 FAS3020 HA CFO iSCSI Base

NetApp F810 Filer Head Unit W/ DS14 MK2 Drive Shelf

**Special NetApp FAS960 Filer Head Unit

NetApp X1033A Dual Ported FCP Adapter (SP-1033A) – NEW

NetApp X1554A Long Wave SFP Brocade Switch – NEW

NetApp DS14MK2-AT w/14x X268A-R5 750GB SATA 10.5TB

专业销售进口DCS  PLC系统备件模块

PLC模块，可编程控制器，CPU模块，IO模块，AI模块，通讯模块。AB/施耐德/ABB/GE/本特利/西屋/英维斯/霍尼韦尔/黑马/FU克斯波罗

15天包退换 一年质保 大量现货  国内实力库存商家


选择深圳长欣，选择放心，售后无忧大量现货，当天顺丰发货！
主营：本特利，英维思，伍德沃德，福克斯波罗、西屋、瑞恩、施耐德莫迪康、ABB、AB、西门子、摩托罗拉、GE发那科、安川、博世力士乐，ACSO，力士乐等各大品牌的DCS系统配件，机器人系统配件，大型伺服系统备件。

先介绍几点经验。
1、先通读一遍“系统手册”（不管能不能看懂，先了解个大概，以便学习编程时查找）；
2、由位控逻辑入手，逐渐增加定时、计数等条件，把或、与、非关系理顺；
3、进而练习整数运算、实数运算、类型转换；
4、量程转换、PID调节回路的建立及P、I、D参数的理解（最好是有个物理回路验证，比如变频器+电机+测速传感器）；
5、循环、顺序、跳转等程序控制（尽量避免跳转，非跳不可时也是跳的越近越好）；
6、中断、通讯、位置控制....

本人以ABB工业机器人配件DSQC系列和Motorola MVME系列，GE 卡件 模块 驱动器系列为主攻。各位电工朋友可根据自己的条件选择适合自己的PLC品牌，由于PLC的基本框架大同小异，学会一种至于其它的学习起来也就简单了。

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