罗克韦尔1746-BTM

罗克韦尔1746-BTM

PLC开关量输出接口有哪几种类型?各有什么特点?

晶闸管输出型:一般情况下，只能带交流负载,响应速度快,动作频率高;

晶体管输出型:一般情况下，只能带直流负载,响应速度快,动作频率高;

继电器输出型:一般情况下，可带交、直流负载,但其响应时间长,动作频率低。

4、按结构型式分,PLC有哪几种类型?各有什么特点?

1）整体式:将CPU、电源、I/O部件都集中在一个机箱内,结构紧凑、价格低，一般小型PLC采用这种结构;

2）模块式:将PLC的各个部分分成若干个单独的模块,可根据需要选配不同模块组成一个系统,具有配置灵活、方便扩展和维修的特点,一般中、大型PLC采用这种结构。模块式PLC由框架或基板和各种模块组成,模块装在框架或基板的插座上。

3）叠装式：结合了整体式和模块式的特点,叠装式PLC的CPU、电源、I/O接口等也是各自独立的模块,但它们之间是靠电缆连接,使得系统不仅配置灵活而且体积小巧。

5、什么叫PLC的扫描周期?它主要受什么影响?

PLC的扫描过程包含内部处理、通信服务、输入处理、程序执行、输出处理五个阶段,这五个阶段扫描一次所需的时间称为扫描周期。

扫描周期与CPU运行速度、PLC硬件配置和用户程序长短有关。

1746-BTM

NetApp DS14MK2 10.5TB 14x750GB SATA Disk Shelf 10.5TB

Includes 1-Year Warranty+EmergentSX Value Added Service

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NetApp V-Series GF980 NAS server

90 day warranty

NetApp DS14 MK2 Shelf w/ 14x 144GB 10K ESH2 FC X274

2x ESH2 Control Modules, 2x Power Supplies

NetApp DS14 Disk Drive Array Shelf 2x Power Supply,2LRC

NETAPP FAS270 ONE Controllers 14 X 300GB FC 4.2TB

NetApp Disk-36GB-10-NF1 REVISION F304 Hard Drive Shelf

NetApp FAS270C Cluster 14 X 276A 300GB 10K FC 2GB

NetApp X266A 320GB ATA TO FC DS14MK2 AT 

NetApp DS14MK2 14 X 300GB 10K FC 2 X ESH2 1 YEAR WAR

NetApp FAS 270 with 14 x 146GB Drives ST3146707FC

NetApp DS14 Network Appliance Storage Shelf 14x 144GB 

NetApp DS14 MK2 14 X 300GB 15K FC 2 X ESH2 2G 4.2TB

NetApp DS14 Network Appliance Storage Shelf 14x 72GB 

NetApp (2) FAS3050C, FAS270, (14) DS14MK2 in (2) Racks

(14) 146GB, (84) 73GB, (92) 320GB, cables

NetApp DS14 MK2 Shelf w/ 14x 144GB 10K FC X274

2x ESH Control Modules, 2x Power Supplies

NetApp DiskShelf DS14mk2 AT 14x 500GB SATA X267A AT-FCX

Qty 1 NetApp DS14MK2-AT DSX-7.0TB-R5-C 500GB SATA 7TB

Includes 1-Year Warranty

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NetApp (2) FAS3050C, FAS270, (51) DS14MK2, R200

(448) 73GB, (280) 320GB, cables

NetApp X294A-R5 2TB SATA TO FC DS14MK2 AT

NetApp X274 144GB FC DS14, DS14 MK2 1 YEAR WARRANTY

Qty 2 NetApp DS14MK2-AT DSX-7.0TB-R5-C 500GB SATA 14TB

Includes 1-Year Warranty+EmergentSX Value Added Service

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NetApp DS14 MK2 Shelf w/ Trays

NetApp 144GB/146GB FC Drive DS14 MK2: X274/X274A/X274B

NetApp X266A 320GB ATA Disk for DS14 MK2 AT 

90 day warranty

NetApp FAS2020C 12 X 1TB SATA X298A-R5 FAS2020

NetApp FAS2050 Filer System 13 x 750GB X283B-R5 9.75TB

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NETAPP 2 Gb ESH 106-00019 NetAPP 43662 - DS14 Chassis 

One-day shipping available

NetApp FAS 250 Exp Shelf & Cont Module 512 mem 2 PS 

NetApp X272 Sp272 108-00056+A1 DK32EJ-72FC 73GB DS 14

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NetApp Cable P/N:112-00028 Molex P/N 739391101

1746-BTM