PLC的发展已经从单一的模式进入了通信的网络时代，并同其它的工控网板和I/O卡板轻易的进行共享。组态软件可以将所有的这些硬件连接起来，通过更直观的动画图片来进行控制，并可以通过互联网在异地进行控制，像神舟五号的发射就是采用这种办法来使飞船升空。
更高层次的发展需要我们不断的努力来取得。PLC的出现已经足足影响了几代人，我们也从上一辈的经验中获取了更多的知识和教训，来不断的发展PLC技术，将它推向更高浪潮。
1.1、PLC历史简述：
60年代以前，汽车生产流水线的自动控制系统基本上都是由继电器控制装置构成。当时汽车的每一次改型都直接导致继电器控制装置的重新设计和安装。随着生产的发展，汽车型号更新周期愈来愈短，这样，继电器控制装置就需要经常地重新设计和安装，十分费时，费工，费料，甚至阻碍了更新周期的缩短。为了改变这一现状，美国通用汽车公司在1969年公开招标，要求用新的控制装置取代继电器控制装置，并提出了的十项招标指标，即：
这十条中的大多数直到仍然是PLC的基础定义（除了第7条输入可以是交流115V，目前已被DC24V替代）。
NEW Honeywell RMA300-ME-TG-F1-C3 Remote Analog Meter
Siemens 6GK 1502-4AB10 SINEC L2F0 OLM Module
Refurbished Allen-Bradley 7300-UPK-3 Logic Board
NEW Siemens 6EC1220-0A PLC Circuit Module
New TEKMAX 13263 Rev. 5 Double Sheet Detection Module
Baldor PNM15030001 Servo Power Supply
GE 176A2823P1 Portable Ground Detector With Case LNC
Honeywell 51400901-100 EMPU Controller Module
Reliance Electric 0-52839 TSSA Drive Module
Phoenix Contact ELR W3/9-500 Elec. Rev. Load Relay
(5) New Garlock 21238-3954 ISO-GARD Seals
Modicon AS-B828-016 5V TTL Fast Output Module
Fuji Sharp SMT VME VM1530 Circuit Board
NEW Dover Flexo 723-0001 SteadyWeb Power Board
Barber-Coleman 10EV-0JF00-000-5-00 Temp. Controller
FANUC A20B-2902-0082/02A Control Module
Allen-Bradley 4100-AEC SSI Transducer/Encoder Module
FANUC 15 A16B-1212-0030/02B Detector Adapter Board
ABB YB560103-CH/8 DSQC 239 Robotic Remote I/O Module
FANUC A20B-2900-0930/01A Control Module
(2) NEW Datalogic S5-5-A2-37 Proximity Sensors
New GE Fuji 6KV$-1PG05 A3603 AF-300V$ Module
New STI F3ILP-20-HTC Fiber Optics Preamplifier
Futec FS5000-2 MPU CPU Module
Refurbished GE Fanuc IC600BF831 5-50VDC Input Module
Micro Systems MC1460-REV C CPU Board
OMRON 3G2C3-CPUA1-E CPU Module
OMRON C500-RT002 Remote I/O Module 3G2A5-RT002-E
IBM 67X1366 Robot Hand-Held Teach Pendant
Daito XC-37 CCD Video Camera W/Sony DC-37 Power Unit
SIEMENS C98043-A1047-L Control Board
GE 531X171TMAABG1 MICRO APPL TB CARD
NEW TURCK VB80-N7X9-5 8-Port Multi-Box With LED
NEW TURCK VB80-N7X9-4 8-Port Multi-Box With LED
Allen-Bradley 700-RTC00110U1 RTC Solid State Timer
Reliance Electric 0-52838 USRA Drive Module
Cincinnati Milacron 3-531-2171A Rev. G Circuit Board
Refurbished By Advanced Technology Services (ATS)
SIEMENS C98043-A1047-L Control Board
Honeywell 30751856-001 Operator Station Memory Board
Foxboro CM902WL I/A Series Power Module 2 – Rev. B
NEW Gettys 11-0089-00 Control Module
AEG Modicon PC-0984-385 Programmable Controller
(6) Allen-Bradley 193-BSB Series B Overload Relays
Refurbished Cincinnati Milacron 3-533-0040G Board
Westinghouse NL-359 Numa-Logic Quad Timer Module
NEW Allen-Bradley 1777-CB I/O Interconnect Cable
ABB YB161102-BR/1 DSQC 125 RELAY BOARD DSQC125
NEW Acrison M-4-1415 Data Conv./Power Supply Board
ABB YB560103-BD/4 DSQC 223 Robotic I/O Module
Modicon AS-884A-211 Controller Module
Honeywell 30750786-001 EDAC Memory Board
STI FS4312B-2X-3 FLEXSAFE TX END SEGMENT TRANSMITTER
(3) NEW Fisher PROVOX CL6851X1-A2 Iso. Voltage Module
Honeywell 82408485-001 SBLA-III Control Board
OMRON C120F-CPUA7-EQ Programmable Controller
NEW Allen-Bradley 5370-MPK Vision Input Software Kit
Foxboro CM902WM I/A Series 3A Power Module Rev. A
Foxboro CM902WX I/A Series Power Module Rev. 0E
Allen-Bradley 1773-L1A PLC-4 Microtrol Controller
Modicon 100-427 BD 3240 6X48K Module
New RTP 021-0161-009 Rev. BB 7455 4-CH Analog Output
New RTP 021-0210-010 Rev. R 8436/SS AI Gate Board
NEW Honewyell Microswitch LSXM4N X-Proof Limit Switch
