上世纪60年代后期，根据当时汽车市场需求和计算技术的发展，在美国麻萨诸塞州Bedford的Bedford Associates,向美国汽车制造业提议开发一种Modular Digital Controller（MODICON）取代继电控制盘。其它一些公司也建议以计算机为基础的方案。其核心思想是采用软件编程方法代替继电控制的硬接线方式，并备有生产现场大量使用的输入传感器和输出执行器的接口，以便于进行大规模生产线的流程控制。这就是以后被称为Programmable Logic Controller的由来。MODICON 084是世界上种投入商业生产的PLC。
70年代是PLC崛起，首先在汽车工业获得大量应用，在其它产业部门也开始应用的时期。80年代是它走向成熟，全面采用微电子及微处理器技术；大量推广应用，并奠定其在工业控制中不可动摇地位的时期。在此阶段PLC销售始终以两位数百分点的速度增长，前六年的增长率超过35%，后四年稳定发展，年增长率约12%。90年代又开始了它的第三个发展时期。随着PLC的国际标准IEC 61131的正式颁布，推动了PLC在技术上发动新的突破：在系统体系结构上，从传统的单机向多和分布式及远程控制系统发展；在编程语言上，文本化和图形化的语言多样性，创造了更具表达控制要求、文字处理、通信能力的编程环境。
从应用范围和应用水平上，除了继续发展机械加工自动生产线的控制系统外，则是发展以PLC为基础的DCS系统、监控和数据采SCADA系统、柔性制造系统（FMS）、安全联锁保护（ESD）系统、运动控制系统等，全方位地产提高PLC的应用范围和水平。
Fisher DPR900X1-A5 DPR 900 Controller DPR900
Fisher Rosemount 0444rl1u1c2na temperaure 0444rl1u1
FIFE CONTROLLER CSP-01-MVRC CSP-01R CSP01MVRC
New OMRON SYSDRIVE Inverter 3G3MV-C2001 .3 kva
Total Control QuickPanel QPL21100C2P A QPI-ABD-201
Leesona Saftronics Drive 1hp 1 hp 968-1492-52 CA 246-2
Westinghouse Sz Size 5 GCA 530 2050A15G16 2045A41G01
Honeywell Chart Recorder AR15ADN2011 120v 24hr NEW
NEW TOYODA MACHINE WORKS MC256-C MC256C MC256 C NEW
Allen Bradley Panelview 550 2711-K5A1 2711K5A1 Ser B
Dynax Robot Controller TT1-3 TT13 TTT1 3 24V
ABB ASEA YPH 105 YPH105 YPH 105A YPH105A YT204001-0Y/2
Telemecanique Altivar 5 Drive ATV45U22N 3hp 3 hp
Honeywell ST3000 Smart Transmitter STA140
New Cutler Hammer CB00107 CB00107-6030 PCP 500V M6
Gould Modicon 115vac Isolated Output B246-501 B246501
FISHER ROSEMOUNT 0444RL2U1A2E5 0444RL2U1A2E5
ABB ASEA Board YPR 104 2668 184-736/1 2668184-736/1
Videojet Technologies 358161-B 358160c Video Jet Card
Reliance Board Card USA1 S-25015 MA-25025 3025514B
NEW ABB 10564930 LED MONITORING NLMD-01CMD 64008447B
NEW Omron PLC CARD C200HOA222 C200H-OA222
Allen Bradley 1791DS-IB8XOB8 1791DSIB8XOB8 CompactBlock
Bently Nevada Thrust Monitor 7200 series 7200 TP-R
Allen Bradley AB Renewal Parts Kit 135110 SP-135110 NEW
HP AGILENT 5335A UNIVERSAL COUNTER
Toyoda Module Card MC256-S090 MS256 S090 MC256S090
ABB ASEA YPQ104 YPQ 104 2668 184-480/1 2668184-480/1
Modicon AEG Micro CPU 110 CPU 512 03 110CPU51203
KAWASKI TEACH PENDANT T03004103 50817 50817-1045R01
Allen Bradley High Resolution Card Module 1771-NIV1 A
Foxboro 556 556-9-43 Pneumatic Analog Computer
HONEYWELL RM7890 A 1056 FLAME AMPLIFIER
Rexroth 1″ Filter R432003072 AS5-FRE-N100-GAU NEW
NEW BUSSMAN JCL-12R FUSE 230 AMP JCL12R 230 A 230A
Reliance DC1-62U DC1 VS DRIVE DC162U 1-2 HP CONTROLLER
AB Allen Bradley 1772-LWP ser D MINI-PLC-2/17 PROCESSOR
Allen Bradley Starter 100-A45NZ*3 100-A45N 100-A45NZ3
Rexroth 1″ Filter R432003067 AS5-FRE-N034-GAU NEW
Rexroth Indramat VE102 VE 102 A1 VE VE102A1 VE102AI
Agastat Timer 2422AC .8-15 SEC 120V Coil
Bielomatik STEURGER 30063107 Minimal Mengen Schmierun
NEW GE IC3600 IC3600LINA1D1B I C3600LINA NEW
Brooks Flow Meter Totalizer Tri-10 9853AC2A1B1A1A2 20vd
Compumotor Corp Motor Drive Controller M5710211 C-B
RELIANCE ELECTRIC 0-51845-2 0 51845 2 0518452
Square D i-line busway pq4203 30A pq-4203 fusible
Nicolet 4094C Digital Oscilloscope & F-43 & 4562 Module
NEW PANALARM RILEY PIAF1T125DC8GP 090-0062-5-03-N
Modicon Schneider Remote I/O Processor AS-P451-622 200
Sew Eurodrive AC Drive C2302.0 3ph 2.0kva 2.0 kva
NEW RELIANCE CCC 25013 CCC-2 CONTROL CARD
SGI Maxi-Tronic Flow Monitor FM-200-1 FM2001 NEW
KAWASKI TEACH PENDANT 50817 50817-1045R01 508171045R01
NEW Mettler Toledo E12889400A Main Board
Oriental Motor Super Vexta 5 Phase Driver UDK5214N-M
Oriental Motor Super Vexta 5 Phase Driver UDK5214N
STI Receiver & Transmitter BSR4601 BSX4601 150′ 150ft
Reliance Printed Circuit 0-56313-1 0563131 0-57002 NEW
Quartech 9302 OPERATOR INTERFACE ENTRY DISPLAY
NEW PANALARM RILEY 91AF1T125DC4GP 090-0047-5-03-N
NEW PANALARM PANATRIP 230A1T120AC31TC1A 230-0003-3-02-B
New PANALARM 070-0106-3-01 70-am1n1 2d 12vdc
ALLEN BRADLEY 1774-TB2 PROGRAM PANEL INTERFACE SERIES B
Siemens Sitrans P Transmitter 7mf4020-1ga00-1bd1-z
Reliance Electric Board Card CCC1 S-25018 S25018
New Omron 3G3MV-C2002 SYSTEM DRIVE SPEED CONTROL
ABB ASEA 5712-0001-CV DSTA-131 2668 184-647/2
Agastat Timer 7012PD 5-50 Sec 120VDC Coil 7012-PD
Yokogawa Yewflo Vortex Flow Converter YFA11 NEW
Westinghouse DSL Limiter 140D316G12 600vac B2,000
Nemic Lambda Power Supply HR-9F-12 HR9F12 120vac NEW
New Omron G7TC-IA16 DC24V G7TCIA16 relay Terminal NIB
NEW GE GENERAL ELECTRIC CR2940NJ202A CR2940 START STOP
Toyoda RMT-1/O M RMT-1/OM PC2J-RMT-I/O THU-2756 NEW
AB Allen Bradley 1772-LW ser C MINI-PLC-2/17 PROCESSOR
