目前很多现代化的工业应用需要更多的功能要求,如网络连接、设备互用、企业数据集成等,这些都远远超过了传统的、基于离散逻辑控制的PLC所能提供的功能,想要基于PLC的系统实现这些功能,必须用单独的处理器、网关获转换器,运行于独立的PC软件中间件以及企业系统级的专用软件进行系统集成。
PC-Based在自动化应用初期被PLC阵营高度质疑,至今市场上仍有相关疑虑,主要问题有稳定性、可靠性和程式设计环境不稳定三点,因此也有工程师将PLC配合PC使用,不过这在系统整合上比较麻烦。
为了解决PLC和PC-Based的整合问题,美国研究机构ARC提出了PAC架构的控制器(可编程自动化控制器),PAC融合了PLC和PC-Based两种技术,在PC层面,会大量应用嵌入式技术,拥有使用软体来定义硬体的能力就是其一。
拥护者认为,PAC的价值在于所有部件均按照软件和硬件集成最灵活、最方便、成本为出发点,从而使得用户设备的生命周期成本较低,资产的投资回报率提高,资产所有者总成本下降。
当然,也有观点认为,PAC仍属于PC-Based产品,只是换了另外一种包装。但就市场整体面来看,PAC的确已经逐渐成形,包括西门子在内的大厂,均已纷纷推出产品,国内像研华也推出了全新一代的PAC控制器APAX-5000系列。
BARBER COLMAN 122-8 USPP 1228
Barber Colman SCR Controller 444303 444-303-03
BARBER COLMAN A-11474 NSPP A11474
BARBER COLMAN SIEBE INVENSYS VB-7313-0-4-9 3 Way 1 1/4 MIXING VALVE NEW IN BOX
Barber-Colman Coleman Chart Recorder Model P105M
BARBER COLMAN MN-S3 NSFP MNS3
BARBER COLMAN A-12477 NSPP A12477
BARBER COLMAN 6NAC-200GB-DOO-B-00 USPP 6NAC200GBDOOB00
Barber Colman HKS-2033 Humidity Duct Transmitter 10 to 90% RH Schneider HKS
BARBER COLMAN A-11009-1 USPP A110091
BARBER COLMAN A-11464 USPP A11464
BARBER COLMAN A-11008-2 USPP A110082
BARBER COLMAN A-13900 USPP A13900
BARBER COLMAN A-11458 USPP A11458
BARBER COLMAN A-11459 USPP A11459
BARBER COLMAN A-60089-101 USPP A
BARBER COLMAN 5656-62030-330-0-00-DISP USPPD
BARBER COLMAN OC53-02F15-320-1-00-DIS USPP OC5302FD
BARBER COLMAN A-11963 USPP A11963
BARBER COLMAN 5656-62031-340-0-00-DISP USPPD
BARBER COLMAN 07PE0-60600-100-00 USPP 07PE
BARBER COLMAN MNL-5RR2 USPP MNL5RR2
Barber Colman 570 Digital Temperature Controller 5743-0
From Canada
BARBER COLMAN 7SF USPP 7SF
BARBER COLMAN CVV-90010-0-0-2 USPP CVV
Barber Colman 121L-10029-340-3 Temperature Controller
BARBER COLMAN 225A-10017-000-1-00 USPP 225A1
BARBER COLMAN COMPANY MP-5210-0-0-2 HYDRAULIC ACTUATOR NEW IN ORIGINAL BOX
Barber Colman Maco 8000 Controller 80FB-10002-001-0-02
(X6-3) 1 USED BARBER-COLMAN EA55 ACTUATOR X6-3
BARBER COLMAN 121L10030-031-1-00 NSPP 121L1
Barber Colman 658B00003 Barber Coleman Converter 658B-00003 - Used
BARBER COLMAN CP-8161-725-2 PLC UNIT REPAIRED & TESTED WITH A 30 DAY WARRANTY
BARBER COLMAN 33-1113 USPP 331113
BARBER-COLMAN CC-8104 FOUR-STAGE SEQUENCER 24V NEW NIB
Barber Colman 570 Digital Temperature Controller *Test*
From Canada
BARBER COLMAN POWER CONTROLLER MODEL CB41-01240-025-100
Barber Colman A-13402-103-1 Maco 4000 AC Output PCB A
Barber Colman Temperature Controller 2204E
BARBER COLMAN MAE1-43300-000-5-00 TEMPERATURE CONTROLLER // NEW
BARBER COLMAN A-13025-202 USPP A
BARBER COLMAN MACO 4000 Temperature Controller A-13398-1
Barber Colman EA-53 Actuator
Barber-Colman Silverline DYN2 90200 Serial number 3589B083 untested
BARBER COLMAN GEAR HOB TiN 14 DEGREE 30' CUTTER P690
BARBER COLMAN 33-1129-2 PC BOARD 3311292
BARBER COLMAN A-11833-1 CONTROL BOARD A118331
BARBER COLMAN 185A-00016-000-0-00 USPP 185A
BARBER COLMAN 852Y-10000-004-0-00-1843 USPP 852Y1
BARBER COLMAN 852Y-10000-004-0-00-2817 USPP 852Y1
BARBER COLMAN MN-S3 NSPP MNS3
BARBER COLMAN MICROPOSITIONER AYLZ 7311-400 RELAY GOVERNMENT SURPLUS
Barber Colman/TAC MP-5213-0-0-4 Hydraulic Actuator 24V MP5213004 New