描述
2711-B6C9
PLC与DCS的前景
我们已经知道有的FCS是由PLC发展而来,而有的FCS是由DCS发展而来,那么,今天FCS已走向实用化,PLC与DCS前景又将如何。
PLC于60年代末期在美国首先出现,目的是用来取代继电器,执行逻辑、计时、计数等顺序控制功能,建立柔性程序控制系统。1976年正式命名,并给予定义:PLC是一种数字控制专用电子计算机,它使用了可编程序存储器储存指令,执行诸如逻辑、顺序、计时、计数与演算等功能,并通过模拟和数字输入、输出等组件,控制各种机械或工作程序。经过30多年的发展,PLC已十分成熟与完善,并开发了模拟量闭环控制功能。PLC在FCS系统中的地位似乎已被确定并无多少争论。IEC推荐的现场总线控制系统体系结构,PLC作为一个站挂在高速总线上。编者以为,辅助车间的控制系统应以遵循现场总线通讯协议的PLC或能与FCS进行通讯交换信息的PLC为优选对象。
自1973年提出第一台以微处理器为基础的控制器以来,它逐步完善,并最终形成功能齐全、安全可*的数字式分散控制系统DCS。它的性能大大优于以住任何一种控制系统。可以满足火电厂DAS、MCS、SCS和APS各系统的各种要求,目前还可以通过工业以太网建立管理层网络,以满足火电厂呼声越来越高的加强管理的要求。可以这样说,DCS系统的监控可以复盖大型火电机组的工艺全过程。
但是,自从有了FCS,并于90年代走向实用化以来,不断有如下论点在公开刊物上发表,即:“从现在起,新的现场总线控制系统FCS将逐步取代传统的DCS”;“当调节功能下放到现场去以后,传统的DCS就没有存在的必要而会自动消失”;“今后十年,传统的4~20mA模拟信号制将逐步被双向数字通信现场总线信号制所取代,模拟与数字的分散型控制系统DCS将更新换代为全数字现场总线控制系统FCS”……。这些论点归纳为一句话:FCS将取代DCS,DCS从此将消亡。
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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
Gel 8010AB11 Minicontroller Lenord+Bauer
SC14.1021 SANGALLI brushed DC servomotor with tacho
Masterspeed drive rack for MS-200 Axor drives NEW
ORN-SW-AM/0 ServoWire module Axis card made by ORMEC
ND31-3204XS-001-000-00 EcoServ drive Lenord+Bauer USED
EPL84 gearbox ratio 5:1 made by EISELE
Gel 244 TAG5 Minicoder NEW Lenord+Bauer 5V Gel 244
SAC-SW217/EP ServoWire drive made by ORMEC
Gel 5452-5V counter Lenord+Bauer
SL30-13FH drive made by Westamp Inc.
Gel 8080S11 Minicontroller Lenord+Bauer
MDRM 24/8 BHLS 24V DC digital servo amplifier Mattke
ORN-DSP-A2/2A Rev 1.1b DSP Axis Module made by ORMEC
DS1044 LAM microstepping drive 50Vdc/4Arms/5.6Apk NEW
I/O-14/08 Expansion Board for selected Servostar drives
DeviceNet board for selected Servostar drives
MAC-E002A2:101 brushless servo motor ORMEC
M51-317/1 mini PC personal controller made by SEI spa
DRS61-E4A08192 programmable incr. encoder NEW 10-32V
DRS61-A1A08192 programmable incr. encoder NEW 5V TTL
Mounting block to replace Siemens SIZAG with Gel244x
F64WKSMB motherboard for Kollmorgen Seidel 64WKS drives
DS1041 LAM microstepping drive 50Vdc/1.4Arms/2Apk NEW
EKM71S-4.6 Brushless Servo Motor 2.5Nm, 6000rpm Koncar
Stepper Control Card for ORMEC GN3 made by nuLogic Inc.
GN3-DSP-A2/A Rev 3.0c DSP Axis Module made by ORMEC
3EF-50 Mains Filter KOLLMORGEN SEIDEL USED
REG 100 gearbox ratio 6:1 made by EISELE
EKM56-L4.6 Brushless Servo Motor 2Nm, 6000rpm Koncar
GEL 262 BE-00050-B20 magnetic incremental encoder, IP65
A27.25-E512 PAPST motor code: 933 2725 500 PAMOdrive
Gel108-TN01024D000 5V encoder 1024ppr LenordBauer USED
Quin Systems Diagnostic Interface with ribbon cable NEW
SAC-E01A2 E-Series AC brushless servodrive ORMEC
Sercos interface board for selected Servostar drives
EKM56-M4.6 Brushless Servo Motor 1.2Nm, 6000rpm Koncar
CRT Eurocard chasis with 5″monitor made by SEI Italy
SM86.2.18.M6 stepper motor 2.5Nm Zebotronics USED
NE B 10-30-3-A1 Power Supply made by ASB
BKL-60/79-28mm & 28mm bores R+W metal bellows coupling
R60WKSMB motherboard for Kollmorgen Seidel 60WKS drive
ST3.6.1 Pre-Select Counter Zebotronics NEW
SHR200-400W MINICLAMP BRAKING PCB AXOR NEW
F65WKSMB motherboard for Kollmorgen Seidel 65WKS drive
STC SDX40E/180 telephone system
SHR140-400W MINICLAMP BRAKING PCB AXOR NEW
GN3-DSP-A2/A Rev 2.1d DSP Axis Module made by ORMEC
SHR200-200W MINICLAMP BRAKING PCB AXOR NEW
R03SMB motherboard for Seidel 03S drives
MRG500 Rubber coated precision Measuring Wheel 500mm
EKM56S-4.6 Servo Motor 0.75Nm, 6000rpm, 300V, Koncar
M21NRXA-JDN-NS-00 Powermax II stepper motor 55W 1500rpm
SHR140-200W MINICLAMP BRAKING PCB AXOR NEW
MRM 500 Anodised metal precision Measuring Wheel 500mm
8PM.V2-XXX.001 connector made by Souriau
M1233062S8 LAM Stepper Motor 2ph 1.8deg 1.8Nm/4.2A NEW
Mini-S Control Terminal made by ICN in France
SHR060-100W MINICLAMP BRAKING PCB AXOR NEW
CBL-GMSW/25 ServoWire cable made by ORMEC USA
CBL-GMSW2/25′ G motor cable made by ORMEC USA
M51-315 motion control module made by SEI spa in Italy
RP/C60.1 motherboard Zebotronics new
BK5-15/63-25mm & 19mm plug-in segment bellows coupling
R03SMB motherboard for Seidel 03S drives
N56WKMB motherboard for Seidel 56WK power supply
PBX-R2-7.5 indexer card made by ICN in France
PBX-ES1 output module made by ICN in France
F60WKSMB motherboard for Kollmorgen Seidel 60WKS drives
BK2-30/69-24mm / 24mm bores R+W metal bellows coupling
60WKS-01 ramp option for Kollmorgen Seidel 60WKS drives
6 core x 5m power cable 4×1+2×0.75mm
Papst 194 0200 005 power supply
PBX-R2-1.5 indexer card made by ICN in France
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
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