福建中立恒自动化设备有限公司
目前，世界上有200多个厂家生产可编程序控制器产品，厂家有德国的西门子，美国的Rockwell(AB)、通用(GE),日本的三菱、欧姆龙，法国的施耐德等。
可编程序控制器总的发展趋势是向高集成度、小体积、大容量、高速度、易使用、高性能方向发展。具体表现在以下几个方面：
(1)向小型化、专用化、低成本方向发展
20世纪80年代初，小型PLC在价格上还高于小系统用的继电器控制装置。随着微电子技术的发展，新型器件大幅度的提高功能和降低价格，使PLC结构更为紧凑，功能不断增加，将原来大、中型PLC才有的功能移植到小型PLC上，如模拟量处理、数据通讯和复杂的功能指令等，但价格不断下降，真正成为继电器控制系统的替代产品。
(2)向大容量，高速度方向发展
大型PLC采用多微处理器系统，有的采用32位微处理器，可同时进行多任务操作，处理速度提高，特别是增强了过程控制和数据处理的功能。另外，存储容量大大增加。
(3)与计算机联系密切
从功能上看，PLC不仅能完成逻辑运算，且计算机的复杂运算功能在PLC中也进一步得到利用，从结构上看，计算机的硬件和技术越来越多地应用到PLC；从语言上看，PLC己不再是单纯用梯形图语言，而且可用多种语言编程，如类似计算机汇编语言的语句表，甚至可直接由计算机语言编程；在通讯方面，PLC与计算机可直接相连并进行信息传递。
(4)发展多样化
可编程序控制器发展的多样化体现在3个方面：产品类型、编程语言和应用领域。
(5)模块化
PLC的扩展模块发展迅速。功能明确化、专用化的复杂功能由专门模块来完成。主机仅仅通过通讯设备向模块发布命令和测试状态，这使得PLC的系统功能进一步增强，控制系统设计进一步简化。
(6)网络与通讯能力增强
计算机与PLC之间以及各个PLC之间的联网和通讯的能力不断增强，使用工业网络可以有效地节省资源、降低成本、提高系统可靠性和灵活性，致使网络的应用有普遍化的趋势。
(7)多样化与标准化
生产PLC产品的各厂家都在大力度地开发自己的新产品，以求占据市场的更大份额。因此产品向多样化方向发展，出现了欧、美、日多种流派。与此同时，为了推动技术标准化的进程。一些国际性组织，如国际电工委员会(IEC)不断为PLC的发展制定一些新的标准，如对各种类型的产品作一定的归纳或定义，或对PLC未来的发展制定一种方向或框架。
(8)工业软件发展迅速
与可编程序控制器硬件技术的发展相适应，工业软件的发展非常迅速，它使系统应用更加简单易行，大大方便了PLC系统的开发人员和操作使用人员。
可编程序控制器的输出信号类型可以是开关量、模拟量和数字量。输出单元从广义上分包含两部分：一是与被控设备相连接的接口电路，另一部分是输出的映像寄存器。
PLC运行时CPU从输入映像寄存器读取输入信息并进行处理，将处理结果放到输出映像寄存器。输出映像寄存器由输出点相对应的触发器组成，输出接口电路将其由弱电控制信号转换成现场需要的强电信号输出，以驱动电磁阀、接触器、指示灯等被控设备的执行元件。
以下链接皆有货
Euchner CES-A-AEA-04B Safety Switch 24 VDC 072000
ListingRiese AR.9618.4000 Safety Relay RS-NAGX8 110-127 VAC
ListingRiese AR.9618.9000 Safety Relay RS-NAGX8 24VDC
STI 44510-0400 Safety Relay SMT01
Siemens 6GT2698-1AC00 Moby D SLG D11 Base Unit
Allen-Bradley 440F-C28013 Matguard Manager Safety Controller
STI 44510-0520 Safety Relay SR08A
Riese AR.9640.5000 Safety Relay RS-NAGV 230VAC
ListingRiese AR.9640.2000 Safety Relay RS-NAGV 24V AC/DC
Omron STI 43776-0010 Safety Relay RM-2
Euchner 085537 Evaluation Unit CMS-E-BR
Allen-Bradley 440R-F23027 Universal Safety Relay MSR9T 24V
Allen-Bradley 440R-E23192 Safety Relay MSR132ED 24VDC
Ametek Panalarm ACS1-125D Relay
Allen-Bradley 440R-M23086 Safety Relay MSR138.1DP 115VAC
IDEC IBRC6061R Safety Relay Barrier
Allen-Bradley 23031 Safety Relay Miaur MSR8T 110/240VAC
Westinghouse Eaton 452D821G19 AQB-LF250 Trip Unit
Parker 3319111535 Gear Pump J0916-15725
STI 44510- Safety Relay SR202AM01
Pulsion Medical Systems CeVOX Oxygen Saturation Monitor PC3000 (Console Only)
Omron CV500-BSC41 Basic Unit
Allen-Bradley 440R-M23065 Safety Timer 24VDC
Allen-Bradley 440L-M8200 Safety Relay 24VDC M8200
Raymond Forklift 154-012-415/003 Flow Sensor Board
STI 44510-0450 Safety Relay SR11M 24V
STI 44510-2031 Safety Relay SR203AM01 24V
4 Diversified Electronics Time Delay Relays TDT-24-AKA-010, TDC-24, etc
Air Systems International 50-ALMSTAA Remote Audible Alarm
Honeywell 30750218-010 Memory Board
ListingRiese AR.9614.8000 Safety Relay RS-NAGX4 24VAC
Schmersal AES2136.3 Safety Relay AES 2136
Pilz 777080 PNOZ X11P Safety Relay 24V
Allen-Bradley 440F-C252D Safety Relay SECD252
Pilz 774401 Safety Relay PAD/BO 512/6/5VDC
Tyco Agastat 1423176-1 Power Relay
Hitachi Seiki NE-8102-01 Circuit Board CNC Board
Duelco NST-2009D Emergency Stop Relay 42080021 24V AC/DC
Larco MAX2324 Safety Mat Monitoring Module 71927 12-24VDC 230VAC
SUNX SF-AC Safety Relay 0801-0420-00
Volumetrics 44861601 Pressure Transducer 0-50 PSIG
STI 44531-0020 Control Unit MC-S2
Telemecanique XPSAK311144P Safety Relay XPS-AK
Jokab RT9 Safety Relay 24VDC 846.0003
Riese SAFE 4 Safety Relay AR.9659.2000 24V
Riese SAFE M Safety Relay AR.9647.2000 24V
Riese SAFE C1 Safety Relay AR.9680.9000 24V
Riese SAFE CM Safety Relay AR.9680.9002 24V
D BD5985N Safety Relay 24VDC
Riese SAFE Z.2 Safety Relay AR.9673.2000 24V
Riese SAFE 4.1 Safety Relay AR.9660.2000 24V
Riese SAFE CL Safety Relay AR.9680.9001 24V
Riese SAFE 5.1 Safety Relay AR.9646.2000 24V
Riese SAFE 4.2 ECO Safety Relay 24V AC/DC
Riese SAFE FLEX Safety Relay AR.9690.2000 24V
Riese SAFE CZ Safety Relay AR.9680.9003 24V
Riese SAFE 4.1 Safety Relay AR.9660.5000 230VAC
STI 44510-2012 Safety Relay SR201A02 115VAC
Marposs E3 Probe Amplifier Controller 81696HG1EA
Schmersal SRB-C.44-24V Safety Relay 24VDC/VAC
Allen-Bradley 440R-F23028 Universal Safety Relay MSR9T 110/230VAC
Siemens 3TK2907-0BB4 Safety Relay 24VDC
Allen-Bradley 440R-H23196 Safety Relay MSR238DP 24VDC
HP 545A Logic Probe
HP 545A Logic Probe
Schott pH Combination Electrode Temperature Sensor A 161 1M-DIN-ID
Banner ATDR1 Two-Hand Control Safety Relay 39900 120VAC
Allen-Bradley 845T-HZ53ECK-C Optical Incremental Encoder
STI 44510-0820 Safety Relay SR19E
Euchner ESM-ES303 Safety Relay 085616 230VAC
IDEC Izbarl IBRC6062R Relay Barrier
IDEC IBRC6052R Safety Relay Barrier
STI 44531-0020 Safety Relay MC-S2
Pilz 540020 PSEN B2 Mechanical Bolt for Safety Switch
Pilz 570510 PSEN si-0.5p 1.1 Magnetic Safety Gate w/ Actuator 570520
STI 44537-0040 Safety Relay EC-S4 24VDC
Riese SAFE IL2 Expansion Relay Module
Pheonix Contact 2903253 Safety Relay PSR-PIP-24DC/MXF1/4x1/2x2/B 24VDC
Siemens 6SL3211-0AB21-1UA1 AC Drive Sinamics G110 CPM110 AIN
Allen-Bradley 8000-KACZ Communications Module
Pilz 657109 Safety Relay ZTN 24-60V
SMC ITV1011-32N1BS Electro-Pneumatic Regulator
Allen-Bradley 440R-M23151 Safety Relay MSR138DP 24V
Schmersal 101176968 Safety Relay SRB301LCI 24V
Siemens 3RK1105-1BE04-2CA0 Safety Relay Monitor
Mitel MC323AE SX-2000 COV Line Card
Allen-Bradley 440R-C23017 Safety Relay MSR6R/T 24V
Riese RS-NAGX4 Safety Relay AR.9614.9000 24VDC
Riese SAFE X4.1 Safety Relay AR.9613.2010 24V AC/DC
Riese SAFE L.2 Safety Relay AR.9671.2100 24V AC/DC
ListingJokab JSBRT11 Safety Relay 115VAC
Omron E3N-30E1 Photoelectric Switch, Emitter and Receiver 12-24VDC
Riese RS-185-4 Safety Relay AR.6401.6881 220VAC
Banner B4-6L Photoelectric Amplifier Module
Allen-Bradley 440R-M23145 Safety Relay MSR138DP 115VAC
Allen-Bradley 440R-M23145 Safety Relay MSR138DP 115VAC
Siemens 6ES5 456-7LB11 Digital Output
Dunham-Bush Vision i Expansion Module PC0EDH4850
Macom PLS24-00 Oscillator 630 2520 Mhz
Allen-Bradley 32001 Ferrotek Control Unit 440N-T32001
Skinner C2DA1031 Electric Solenoid Valve 36VDC
Omron STI SR109AD01 Safety Relay 44510-1091
Riese ILZ Safety Relay Module
Belimo AF24-PWM US Damper Actuator AF24PWMUS
Riese RS-TMSW Safety Relay AR.6223.2000 24V AC/DC
Pilz 445450 PA-1S Safety Relay 110VAC
Banner AT-FM-10K Machine Safety Relay 24V AC/DC
Allen-Bradley 440R-H23179 Safety Relay MSR221P 24VDC
Pilz 445650 PA-1S/100/110VWS/1U Safety Relay 110VAC PA-1S
MKS Novx Process Monitor Series 7000
Allen-Bradley 156-A50AA2 Solid State Contactor
ABB CC-U/TCR Universal Signal Converter 1SVR040014R2000
Euchner 087891 Safety Relay SFM-B02 24VDC
Liburdi Automation A014912 L-2000/4000/8000 Bevel Miter Gear Subassembly
Allen-Bradley 700-PL400A24 AC Relay
Dynisco 3342EA05P15FEDDCCAZZ Pressure Transducer URV 750/Max 750PSIG 24VDC
Allen-Bradley 440R-W23218 Safety Relay MSR320P 24VDC
SUNX SF-AC Safety Relay 0801-0420-00 24VDC
Sigma Instruments 5J0-5000S-SIL Relay 1 AMP 65.8V
Allen-Bradley 440N-T32001 Safety Relay 24V
Eaton ESR5-NO-41-24VAC-DC Safety Relay
Omega PX603 Transducer 100psig Range 10-36V 200psig Proof
MicroSys Computers CPU07 Module
Riese RS-193-4 Safety Relay 230VAC
Allen-Bradley 700S-DCP620DZ24 Safety Control Relay
Dynisco 3342EA05P17FEDDCCAZZ Pressure Transducer URV 1500/Max 1500PSIG
Omron STI 44506-5423 Safety Switch ER6022-021NELAC
Coastal Environmental Systems C-5 SAM Display Unit
Ferraz Shawmut 323A2437P101 Protistor 1000VAC 1000A
Telemecanique XPSAP5140 Safety Relay XPS-AP 24VDC
ABB 2TLA010026R0000 Safety Relay RT6 24VDC
Allen-Bradley 440F-C252D Safety Relay 24V SECD252