目前很多現(xiàn)代化的工業(yè)應(yīng)用需要更多的功能要求，如網(wǎng)絡(luò)連接、設(shè)備互用、企業(yè)數(shù)據(jù)集成等，這些都遠(yuǎn)遠(yuǎn)超過(guò)了傳統(tǒng)的、基于離散邏輯控制的PLC所能提供的功能，想要基于PLC的系統(tǒng)實(shí)現(xiàn)這些功能，必須用單獨(dú)的處理器、網(wǎng)關(guān)獲轉(zhuǎn)換器，運(yùn)行于獨(dú)立的PC軟件中間件以及企業(yè)系統(tǒng)級(jí)的專用軟件進(jìn)行系統(tǒng)集成。
PC-Based在自動(dòng)化應(yīng)用初期被PLC陣營(yíng)高度質(zhì)疑，至今市場(chǎng)上仍有相關(guān)疑慮，主要問(wèn)題有穩(wěn)定性、可靠性和程式設(shè)計(jì)環(huán)境不穩(wěn)定三點(diǎn)，因此也有工程師將PLC配合PC使用，不過(guò)這在系統(tǒng)整合上比較麻煩。
為了解決PLC和PC-Based的整合問(wèn)題，美國(guó)研究機(jī)構(gòu)ARC提出了PAC架構(gòu)的控制器（可編程自動(dòng)化控制器），PAC融合了PLC和PC-Based兩種技術(shù)，在PC層面，會(huì)大量應(yīng)用嵌入式技術(shù)，擁有使用軟體來(lái)定義硬體的能力就是其一。
擁護(hù)者認(rèn)為，PAC的價(jià)值在于所有部件均按照軟件和硬件集成靈活、方便、成本為出發(fā)點(diǎn)，從而使得用戶設(shè)備的生命周期成本較低，資產(chǎn)的投資回報(bào)率提高，資產(chǎn)所有者總成本下降。
當(dāng)然，也有觀點(diǎn)認(rèn)為，PAC仍屬于PC-Based產(chǎn)品，只是換了另外一種包裝。但就市場(chǎng)整體面來(lái)看，PAC的確已經(jīng)逐漸成形，包括西門子在內(nèi)的大廠，均已紛紛推出產(chǎn)品，國(guó)內(nèi)像研華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 A60089101
BARBER COLMAN 5656-62030-330-0-00-DISP USPPD
BARBER COLMAN OC53-02F15-320-1-00-DIS USPP OC5302F15320100D
BARBER COLMAN A-11963 USPP A11963
BARBER COLMAN 5656-62031-340-0-00-DISP USPPD
BARBER COLMAN 07PE0-60600-100-00 USPP 07PE06060010000
BARBER COLMAN MNL-5RR2 USPP MNL5RR2
Barber Colman 570 Digital Temperature Controller 5743-0
From Canada
BARBER COLMAN 7SF931103000 USPP 7SF931103000
BARBER COLMAN CVV-90010-0-0-2 USPP CVV90010002
Barber Colman 121L-10029-340-3 Temperature Controller
BARBER COLMAN 225A-10017-000-1-00 USPP 225A10017000100
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 121L10030031100
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 A134021031
Barber Colman Temperature Controller 2204E
BARBER COLMAN MAE1-43300-000-5-00 TEMPERATURE CONTROLLER // NEW
BARBER COLMAN A-13025-202 USPP A13025202
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 185A00016000000
BARBER COLMAN 852Y-10000-004-0-00-1843 USPP 852Y100000040001
BARBER COLMAN 852Y-10000-004-0-00-2817 USPP 852Y100000040002
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