可编程控制器广泛运用于工业现场工作中。了解plc可编程控制器原理有助于人们更好更顺利地工作。本文就可编程控制器实现控制的要点来分析研究plc可编程控制器原理。

　　它源于继电控制装置，但它不像继电装置那样，通过电路的物理过程实现控制，而主要靠运行存储于PLC内存中的程序，进行入出信息变换实现控制。

　　PLC基于电子计算机，但并不等同于普通计算机。普遍计算机进行入出信息变换，多只考虑信息本身，信息的入出，只要人机界面好就可以了。而PLC则还要考虑信息入出的可靠性、实时性，以及信息的使用等问题。特别要考虑怎么适应于工业环境，如便于安装，抗干扰等问题。

　　可编程控制器实现控制的要点

　　入出信息变换、可靠物理实现，可以说是PLC实现控制的两个基本要点。

　　入出信息变换靠运行存储于PLC内存中的程序实现。PLC程序既有生产厂家的系统程序(不可更改)，又有用户自行开发的应用(用户)程序。系统程序提供运行平台，同时，还为PLC程序可靠运行及信号与信息转换进行必要的公共处理。用户程序由用户按控制要求设计。什么样的控制要求，就应有什么样的用户程序。Basler Electric Transformer BE15062002 120V LO 240/480V HI New

CKD SSD-25-50 SSD2550 3 1/16" - 5 1/16" AIR PNEUMATIC CYLINDER NEW

MOTION CONTROL D12SENC SL1 RA1 5 1/2" - 6 1/2" AIR PNEUMATIC CYLINDER NEW

Vickers Coil 20106A 24 VAC New

Ingersoll Rand ARO Roller Valve M211RS New

Inline Pneumatic Actuator w. 1-1/2" NPT Ball Valve AP-SR-100-B-N APSR100BN New

SCHRADER BELLOWS CYLINDER PAE112122 STROKE 11" 3/4" NEW

REXROTH 0 822 410 200 0822410200 3 21/32" - 4 21/32" AIR PNEUMATIC CYLINDER NEW

SPEEDAIRE 6D861 12" - 18" AIR PNEUMATIC CYLINDER NEW

MEAD HD-200X4.0000FB HD200X4.0000FB 9 3/8" - 13 3/8" AIR PNEUMATIC CYLINDER NEW

New Sheffer Pneumatic Cylinder 5C20F-10A Stroke 7-1/4

New Rexroth Air Cylinder 521 185 006 0 5211850060 150PS

Bimba Air Cylinder UH MRS-027-D MRS027D 6 7/8" str NEW

PARKER ACTUATOR PTR151-1803FP-AB21M-C 250PSI 7/8" NEW

Diablotek ATX Power Supply DA Series PSDA400 400 Watt 115/230 VAC Used

HUMPHREY 8-D-1 1/4 M 1-1/8" STROKE AIR CYLINDER NEW

Rexroth Cylinder 10" strk 0822031221 0 822 031 221 NEW

PARKER 04.00 C2AU14A 1.000 CYLINDER 9" EXTENDED LENGTH

JOSEPH MACHINE FD363457 A 800010 PNEUMATIC CYLINDER NEW

SCHRADER BELLOWS 1.25DXPSR02.0 DH 8" - 10" AIR PNEUMATIC CYLINDER NEW

FESTO DGS-16-10 P 2 87R AIR PNEUMATIC CYLINDER NEW

CLIPPARD UDR 32 4 B UDR324B 11" - 15" AIR PNEUMATIC CYLINDER 

COMPACT SD34X12-FT SD34X12FT AIR PNEUMATIC CYLINDER NEW

JOSEPH MACHINE FD386336 A 800081 PNEUMATIC CYLINDER NEW

REXROTH MECMAN 521 710 506 0 PNEUMATIC CYLINDER

Johnson Controls Diaphragm Actuator V-3000-1 w. 3/4" NPT Brass Bronze Valve New

FABCO Square 1 SOT 321 1 1/2MR  SOT32111/2MR " str

NEW FLO-TORK ROTARY ACTUATOR 3700-180-CB-ES-MS2X-RKH-N 180 ROTATION 3000 PSI

FESTO DSNU-5/8"-0.5"-P-A-B 5" - 5 1/2" AIR PNEUMATIC CYLINDER NEW

Hydac Diaphragm Hydraulic Accumulator SB0210-1.4 E1/112U-210AB 210 Bar 80ºC Used

NOS SSH A.S DK-5700 STAINLESS S/S HYDRAULIC CYLINDER 50mm BORE 279.24mm STROKE

Phoenix Contact Power Supply QUINT-PS/1AC/24DC/10 240 VAC 24 VDC 10 A Amp New

Worcester/McCANNA Series 93 Pneumatic Actuator Model 10 39W 120A 80 PSI New

INDUSTRIAL GAS SPRINGS GS2596-1 19 12 AIR PNEUMATIC CYLINDER NEW

New SMC Pneumatic Air Cylinder ECDQ2B32-20D Z-1293

Diablotek ATX Power Supply DA Series PSDA400 400 Watt 115/230 VAC SEALED 

PARKER 02.50 2RLP 9 3.000 AIR PNEUMATIC CYLINDER NEW

URBAN ESG. 40/200 10 BAR AIR PNEUMATIC CYLINDER NEW

Shrader Bellows Air Cylinder 3/4" stroke 4" bore

URBAN 63/50 10 BAR AIR PNEUMATIC CYLINDER NEW

hydraulic CYLINDER 76" EXT 43" COMP 33" STROKE 

BIMBA FLAT-1 FOD-041.75-2F3R FOD041752F3R DUAL ACTING AIR PNEUMATIC CYLINDER NEW

ALLENAIR A-1-1/2 X 1-CB A112X1CB 6 1/2" - 7 1/2" AIR PNEUMATIC CYLINDER NEW

GROB VERTRIEBS EBERHARD HYDRAULIC CONTROL ELECTRIC CYLINDER EZ20-PAD-14500-12-30

NEW LOT OF 8 HALCO MINIATURE LAMP LIGHT BULB 66008 36MSCP 120V 

HYPERCYL/HYPER 6277 CYL CYLINDER 3" STROKE

1" Worcester 44 Actuator Kit FF-E100 NIB

PARKER AIR CYLINDER GD514527 G D514527 A NEW