RCA-S-S5

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描述

RCA-S-S5

应该注意的是，同一企业应尽量做到机型统一。这样，同一机型的PLC模块可互为备用，便于备品备件的采购和管理；同时，其统一的功能及编程方法也有利于技术力量的培训、技术水平的提高和功能的开发；此外，由于其外部设备通用，资源可以共享，因此，配以上位计算机后即可把控制各独立系统的多台PLC联成一个DCS系统，这样便于相互通信，集中管理。PLC在20世纪90年代已经形成微、小、中、大、巨型多种PLC。按I/O点数分，可分为微型PLC（32I/O）、小型PLC（256I/O）、中型PLC（1024I/O）、大型PLC（4.69I/O）、巨型PLC（8195I/O）五种。PLC与工业生产过程的联系是通过I/O接口模块来实现的。PLC有许多I/O接口模块，包括开关量输入模块、开关量输出模块、模拟量输入模块、模拟量输出模块以及其他一些特殊模块，使用时应根据它们的特点进行选择。根据控制系统的要求确定所需要的I/O点数时，应再增加10%～20%的备用量，以便随时增加控制功能。对于一个控制对象，由于采用的控制方法不同或编程水平不同，I/O点数也应有所不同。表2列出了典型传动设备及常用电气元件所需的开关量的I/O点数。 开关量I/O接口可从传感器和开关（如按钮、限位开关等）及控制设备（如指示灯、报警器、电动机起动器等）接收信号。典型的交流输入/输出信号为24～240V，直流输入/输出信号为5～240V。尽管输入电路因制造厂家不同而不同，但有些特性是相同的，如用于消除错误信号的抖动电路等。此外，大多数输入电路在高压电源输入和接口电路的控制逻辑部分之间都设有可选的隔离电路。在评估离散输出时，应考虑熔丝、瞬时浪涌保护和电源与逻辑电路间的隔离电路。熔丝电路也许在开始时花费较多，但可能比在外部安装熔丝耗资要少。  在选择一台PLC时，用户可能会面临一些特殊类型且不能用标准I/O实现的I/O限定（如定位、快速输入、频率等）。此时用户应当考虑供销厂商是否提供有特殊的有助于最大限度减小控制作用的模块。有些特殊接口模块自身能处理一部分现场数据，从而使CPU从繁重的任务处理中解脱出来。 当前，PLC的生产厂家相继推出了一些智能式的I/O模块。一般智能式I/O模块本身带有处理器，可对输入或输出信号作预先规定的处理，并将处理结果送入CPU或直接输出，这样可提高PLC的处理速度并节省存储器的容量。

产品承诺：
保 证 全新原装进口,
保 证 安全准时发货，
保 证售后服务质量，
优势价格，大量现货。

主营DCS系统配件
机器人系统配件
大型伺服系统配件
品牌：ABB   ,AB  ,GE,FOXBORO,本特利，英维思，伍德沃德，西屋，瑞恩，施耐德，西门子，摩托罗拉，安川。力士乐。ACSO，横河等进口品牌。 专业销售进口DCS  PLC系统备件模块
Triconex Siemens Yaskawa ABB GE Ovation AB Foxboro Motorola Schneider XYCOM KUKA   专业销售进口DCS  PLC系统备件模块 15天包退换 一年质保 大量现货  国内实力库存商家

NetApp FAS3020 Filer w/DS14MK2 14x 300GB 10K 4.2TB!!!!!

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NetApp FAS3020 Filer w/DS14MK2 14x 300GB X276A 4.2TB!!!

NetAPP FAS270 Network Appliance Filer + 14 x 300GB

Lot 10pc Netapp X269A-R5 SP-269A-R5 108-00180 1TB SATA

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

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

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

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

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

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

NetApp FAS3020 Filer w/DS14MK2 14x 300GB 10K 4.2TB!!!!!

NetApp FAS3050 Filer DS14MK2-AT 14x 500GB X267A 7TB!!!

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NETAPP FAS6070 Filer Head Controller 1 YR WARRANTY!!!

NETAPP FAS6070 Filer Head Network Appliance 4gpbs !!!!

NETAPP FAS6070 Filer Head Network Appliance FAS 6070

NetApp X3770A F840 Motherboard

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NetApp C3100 NetCache

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

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

NetApp FAS940 Filer w/4x DS14MK2 14x 144GB 10K X274B-R5

NetApp F87 Filer Tower w/ 6x36GB – Network Appliance

NetApp FAS270C Filer Cluster w/ 14 X276A 300GB 10K FCAL

NetApp DSK SHLF,10.5TB SATA,,R5 SATA DS14MK2-AT 10.5TB!

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

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

NETAPP NETWORK APPLIANCE SAS SATA FILER SYSTEM FAS-2020

Netapp FAS3070 Filer Head Network Appliance FAS 3070

NetApp FAS3020 Filer DS14MK2 14x 144GB 15K X275A-R5 2TB

Netapp FAS3070 3070 Filer Head Controller 4gbps 1 yr

NETWORK APPLIANCE NETAPP DS14MK2 AT, 14 X 750GB(X268A)

NetApp FAS3050 Filer w/2x DS14MK2 14 144GB 10K X274A-R5

NetApp FAS3020 Filer DS14MK2 14x 144GB 15K X275A-R5 2TB

NetApp FAS270 Filer Head w/14 X276A 300GB 10K FCAL

NetApp FAS980c Filers Cluster Network Appliance FAS980

NetApp FAS3050 Filer w/2x DS14MK2 14 144GB 10K X274A-R5

NetApp FAS270 Filer Head w/14 X276A 300GB 10K FCAL

NetApp FAS2020 w/2 111-00237 filer modules, 12 x SAS300

NetApp FAS980c Filers Cluster Network Appliance FAS980

NetApp FAS3020 Filer DS14MK2-AT 14x 500GB X267A-R5 @@@

NetApp FAS3020 Filer DS14MK2-AT 14x 500GB X267A-R5 4TB!

NetApp FAS3020 Filer DS14MK2-AT 14x 500GB X267A-R5 7TB!

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

NetApp SK-F825 Spares Kit for F825 Filer

NetApp FAS3020 Filer DS14MK2 14 x 300GB X276A-R5 4.2TB

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

NetApp FAS3050C Network Appliance Filer Head

NetApp FAS3020c 2x Filers / 2x DS14 MK2 / 28x 146GB

NetApp DS14 MK2 Shelf w/ (14) 144GB 10K HDD

Netapp FAS2050C Cluster Filer Head Dual Controller

Netapp FAS2050C Cluster 2x Controller FAS2050 Clustered

NetApp SK-FAS960 Spares Kit for FAS960 System

NetApp X749A DC Power Supply Network Appliance

NetApp X3772B F820/F810/C3100 Motherboard

NetApp SK-F840B Spares Kit for F840 Filer

NETAPP FAS3050c Cluster 2 Filer Heads FAS 3050 Disk

NETAPP FAS3050C Clustered Filer Heads FAS 3050 Cluster

Network Appliance FAS3050C Cluster 2 Filer Heads Netapp

NETAPP FAS3050c Cluster 2 Filer Heads FAS 3050 @@@@@@@@

NETAPP FAS3050c Cluster 2 Filer Heads FAS3050 Clustered

NETAPP FAS3050c Cluster 2 Filer Head FAS3050 1 yr wrty

NETAPP FAS3050C Cluster 2 Filer Heads FAS3050 @@@@@

Netapp FAS6030-BASE-R5 Filer Head Network Appliance

NETAPP FAS3020C Cluster 2 Filer Head FAS 3020 Clustered

NETAPP FAS3020C Cluster 2 Filer Heads Clustered 3020

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

NETAPP FAS6030 Filer Head Network Appliance FAS 6030

NETAPP FAS6030 Filer Head Network Appliance 4gpbs !!!!

NETAPP FAS3020C Cluster 2 Filer Heads FAS3020 Clustered

NetApp FAS270C FILER HEAD 14 X 276A 300GB 10K 2G FC

NetApp DS14mk2 AT Shelf w/ 14 X268A-R5 750GB SATA

NetApp 14 X268A-R5 750GB SATA DS14mk2 AT Shelf

NETAPP FAS3020C Cluster 2 Filer Heads FAS3020 Clustered

NetApp F825 Filer Head Unit

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

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

NetApp FAS3050 Filer w/ DS14MK2 14 144GB 10K X274A-R5

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

Netapp SATA Disk Shelf DS14MK2 AT w14x 750GB X268A-R5

Netapp DS14MK2-AT 14x 750GB X268A-R5 SATA Disks 10.5TB-

NetApp DSX-10.5TB-R5-C DS14MK2-AT 14x X268A-R5 750GB

NetApp DS14MK2 SHLF,10.5TB SATA,-C,R5 X268A 10.5TB @@@@

NetApp DSK SHLF,10.5TB SATA,,R5 SATA DS14MK2-AT 10.5TB!

NetApp 14 x 750gb DS14MK2-AT X268A MK2AT 10.5TB shelf

NetApp DS14MK2 AT (14) X268A-R5 750GB SATA 10.5TB!!!!!

NetApp X294A-R5 2TB 7.2k SATA Hard Drive

NetApp, X299A-R5, 2TB, 7.2K, SATA, Hard Drive

NetApp DS14 MK2AT (14) X268A-R5 750GB SATA Disk 10.5TB!

NetApp DS14MK2-AT w/14x X268A-R5 750GB 10.5TB DS14MK2AT

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

NetApp DSX-10.5TB-QS-R​5 DS14MK2-AT 14) X268A-R5 750GB

NetApp DSX-10.5TB-R5-C DS14MK2-AT 14x X268A-R5 750GB

NetApp DS14MK2-AT 10.5TB w/ 14x 750GB 7.2K SATA HDs

NetApp DS14MK2-AT 10.5TB (14) X268A 750GB SATA Drives

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

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

NetApp X306A-R5 2TB 7.2K RPM 3Gb SATA HDD for DS4243

NetApp DS14MK2 AT 14x X268A-R5 750GB SATA HDs 10.5TB!!!

NetApp DS14MK2-AT 14x X268A-R5 750GB DS14MK2 AT 10.5TB
One-day shipping available

NetApp DS14MK2-AT w/14x X268A-R5 750GB 10.5TB DS14MK2AT
One-day shipping available

NetApp DS14MK2 SHLF,10.5TB SATA,-C,R5 X268A-R5 10.5TB!!
One-day shipping available

Network Appliance Netapp DS14MK2AT 14x 750GB X268A X268
QTY DISCOUNT AVAILABLE!! w/ACCESSORIES!​!!
One-day shipping available

Enlarge
NetApp DS14MK2-AT 10.5TB 14 X 268A-R5 750GB SATA Drives
One-day shipping available

NetApp FAS3020 / FAS3050 – FAS3040 / FAS3070 Spares Kit

DECRU NetApp DataFort S110 NAS SCSI Security Appliance

NetApp F760 w/ DS14 (13×72 Gb) & FC9 (6×36 Gb)

NetApp X3128 NVRAM III Card 128MB SP-3128 – NEW

NetApp FAS2020 Filer Module X3249A-REF

NetApp X501 DS14 FC-AL Disk Shelf – NEW

NetApp X5712A-R6 IOM3 3Gb SAS Controler Module

NetApp DSX-7.0TB-QS-R5 2x DS14MK2-AT 28x X267A-R5 14TB!

(2) NetApp DS14MK2-AT w/14 X 267A-R5 500GB SATA 14TB!!

(2) NetApp DS14MK2-AT w/14x 500GB SATA X267A-R5 14TB!!!

2-NetApp DSX-7.0TB-QS-R5 DS14MK2-AT 500GB 14TB of Disk
One-day shipping available

(2) NetApp DSX-7.0TB-R5-C DS14MK2-AT 500GB SATA 14TB!!!

(2) NetApp DS14MK2-AT 14x X267A-R5 500GB SATA 14TB@@

(2) NetApp DSX-7.0TB-QS-R5 DS14MK2-AT X267A-R514TB!!!​!!

(2) NetApp DSX-7.0TB-QS-R5 DS14MK2-AT 500GB SATA 14TB!!

Enlarge
(2) NetApp DS14MK2-AT 14.0TB w/14 X267A-R5 500GB SATA

NetApp F740 Filer System Array With Cabinet VRIS38S

NETAPP FAS270 ONE Controllers 14 X 300GB FC 4.2TB

NetApp FAS960 Network Appliance Filer Head
We buy your NetApp, EMC, IBM, SUN surplus.

NetApp NetCache C3300 6 X 72GB 10K FC
We buy your NetApp, EMC, IBM, SUN surplus.

NETAPP FAS270 14 X 300GB FC ONE YEAR WARRANTY 4.2TB

NetApp X1937A-R5 PCIe, 256GB, PAM II Card
We buy your NetApp, EMC, IBM, SUN surplus.

NetApp FAS270C Filer Cluster w/ 14 X274A 144GB 10K 2TB!

NETAPP FAS3020 FILER W/ 3x DS14MK2 5TB X272 X262B X234

NetApp FAS3020 Filer DS14MK2 14x 144GB 10K X274B-R5 2TB
1 Year Warranty! Ask about Disk Shelves! WE BUY SURPLUS

Network Appliance NetApp VTL700 Virtual Tape Library

NetApp X900A-ESH2-QS-R​5-C DS14MK2 SHLFACPS14x300G​B

NetApp SP-2050B Dual Port FC-AL Controller (LC) – NEW

NetApp X2051A Dual Port FC-AL Controller Tape (LC) NEW

NetApp X2044A Dual Port FC-AL Card Op (SP-2044A) – NEW

NetApp Dual Optical X2044B Controller (SP-2044B) – NEW

NetApp SK-F760B Spares Kit for F760 Filer – NEW

NetApp SP-2051A Dual Port FC-AL Controller Tape – NEW

StoreVault S550 by NetApp iSCSI Storage Array 6TB
£2250 ex VAT,Free WW UPS Delivery, Tested

Enlarge
NetApp C1105B NetCache

NetApp F840 Filer Head Unit
5 Year Next Business Day Warranty on All NetApp

NetApp DS14MK4 Shelf 14x 300GB 10K FC X276A-R5 4.2TB
We buy your NetApp, EMC, IBM, SUN surplus.

NetApp DS14MK4 Shelf w/ 14x 300GB 10K FC X276A 4.2TB
We buy your NetApp, EMC, IBM, SUN surplus.

NetApp DS14MK4 w/ 14x 300GB 10K FC X276A
We buy your NetApp, EMC, IBM, SUN surplus.

NetApp DS14MK4 w/ 4.2TB 14x 300GB 10K FC X276A
We buy your NetApp, EMC, IBM, SUN surplus.

Netapp X412A-R5 600GB 15K SAS Disk Drive for a DS4243

NetApp X500 14x72GB 10K DS14 Shelf

NetApp X3145A NVRAM V Card 512 MB – NEW

NetApp X2052A-R6 320MB, Dual Channel, PCIE, SCSI HBA

NetApp X2054A-R6 quad port 1/2/4 GBIT PCIE FC Initiator

NetApp C6200 NetCache System
We buy your NetApp, EMC, IBM, SUN surplus.

NetApp 2-Port X1008A-R6 10GbE NIC TOE FC Fiber NOB

NetApp X2054B-R6 FC-AL HBA FC 4-port PCIe 4Gb – New

Lot 25pc NetApp 500GB SATA SP-267 X267A-R5 108-00088
$160 each!! Qty available!! 1 yr Warranty!! 949-553-644
One-day shipping available

NetApp FAS270c FAS270C-UG2-BAS​E-B-R5 Dual Controllers

NetApp FAS270c FAS270C-UG2-BAS​E-B-R5 Dual Controllers

Netapp DS14MK4 X9400A-ESH4-QS-​R5 300GB 10K X276A
w/ Accessories – cables, railkit, gbics 1yr Warranty

NetApp NetCache X259A 100GB SATA HDD for C1300 SC300

Net app DS14MK4 (14) X276A 300GB 10K 4.2TB Disk Shelf
w/ Accessories – cables, railkit, gbics 1yr Warranty!!

**Special NetApp FAS940 Filer Head Unit
5 Year Next Business Day Warranty on All NetApp

NetApp FAS920 Filer Head Unit Network Appliance
5 Year Next Business Day Warranty on All NetApp

Netapp FAS2050 Filer Head No Disk Single Controller
We Buy Surplus Netapp, Cisco, Sun, HP, IBM, Dell

NetApp R150 Network Appliance R150 NearStore System

NetApp X1202 ATM OC-3 (UTP Copper)

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

NetApp X1203B OC12 ATM Optical SP-1203B

NetApp X1028A Dual Ported FCP Adapter SP-1028A

NetApp X5611A AT-FC Storage Controller Module

NetApp DS14 MK4 w/14x 144GB 15K X278A-R5 X278A **`
One-day shipping available

Netapp DS14 MK4 Disk shelf (14) 144gb 15K 4gbps 2TB
*****SELL ECS YOUR SURPLUS IT EQUIPMENT*****​***********
One-day shipping available

NetApp DS14MK4 Disk Shelf w/14x 144GB FC 15K X278A-R5
We Buy your Surplus NETAPP, SUN, DELL, HP, CISCO, IBM
One-day shipping available

NetApp DS14 MK4 w/14x 144GB 15K X278A-R5 FC 2TB DS14MK4
We Buy your Surplus NETAPP, SUN, DELL, HP, CISCO, IBM.
One-day shipping available

NetApp DS14MK4 X74015B-ESH4-QS​-R5 w/14x 144GB 15K FCAL
We Buy your Surplus NETAPP, SUN, DELL, HP, CISCO, IBM.
One-day shipping available

NetApp DS14 MK4 w/14x 144GB 15K X278A-R5 X278 2TB 4gbps
We Buy your Surplus NETAPP, SUN, DELL, HP, CISCO, IBM.
One-day shipping available

NetApp DS14 MK4 W/14x 144GB 15K X278A X278A-R5 15K FCAL
One-day shipping available

NetApp DS14MK4 X74015B-ESH4-R5​-C W/14x 144GB 15K FCAL
One-day shipping available

NetApp DS14MK4 X74015B-ESH4-QS​-R5 w/14x 144GB 15K FCAL
One-day shipping available

NetApp DS14MK4 SHLF,AC,14x144G​B,15K,B,ESH4,QS​,R5
One-day shipping available

NetApp DS14MK4 SHLF,AC,14x144G​B,15K,B,ESH4,-C​,R5
One-day shipping available

NetApp DS14MK4 Disk Shelf w/14x 144GB FC 15K X278A-R5
One-day shipping available

NetApp DS14MK4 Disk Shelf w/14x 144GB 15K FCAL Disk
One-day shipping available

NetApp DS14MK4 Disk Shelf w/14x 144GB 15K FCAL 2.106TB
One-day shipping available

NetApp DS14MK4 X74015B-ESH4-QS​-R5 (14) 144GB 15K FC @@@
We Buy your Surplus NETAPP, SUN, DELL, HP, CISCO, IBM.
One-day shipping available

NetApp DS14 MK4 Shelf w/ 14x 144GB 15K FC X278A DS14MK4
One-day shipping available

NetApp DS14 MK4 w/14x 144GB 15K X278A-R5 X278A DS14MK4
One-day shipping available

NetApp DS14MK4 w/14x 144GB 15K 2.106TB! DS14 MK4 X278A
One-day shipping available

Network Appliance NETAPP DS14MK4 W/14 X 144GB 15K HD,
One-day shipping available

NetApp DS14MK4 Disk Shelf w/14x 144GB 15K FCAL 2TB ~~
One-day shipping available

NetApp DS14MK4 SHLF,AC,14x144G​B,15K,B,ESH4,-C​,R5 ~~
One-day shipping available

NetApp X306A-R5 X306A R5 2TB 7.2K RPM 3Gb SATA HDD
2 year warranty – we buy and sell networking equipment

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Netapp X290A-R5 600GB 15K SAS Hard Drive

NetApp X292A-R5 600GB FC 15K RPM Hard Disk Drive

NetApp X550 DS14mk2 FC-AL Disk Shelf Base 2 PS NEW

Lot 5pcs Netapp X269A-R5 SP-269A-R5 108-00180 1TB SATA
$740 each!! 1 Year Warranty!! Full Shelves available!!!
One-day shipping available

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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