PLC主要由输入板块、CPU板块、输出板块、通信板块、电源板块等部分组成，各大板块之间的关系如组成框图所示。
与个人计算机相比，PLC在标准化方面作得较差：PLC的软、硬件体系结构是封闭的而不是开放的；绝大多数PLC使用专用的总线、专用通信网络及协议；各种PLC产品的编程语言在表示方式、寻址方式和语法结构上都不一致，使得它们互不兼容。国际电工委员会的IEC6113l-3《可编程序控制器的编程软件标准》为PLC编程的标准化铺平了道路。不少厂家正在开发以PC(个人计算机)为硬件平台、在Windows操作系统下、符合IEC61131-3国际标准的新一放体系结构的PLC。
以上两个主要原因，使得PLC得I/O响应比一般微型计算机构成的工业控制系统满的多，其响应时间至少等于一个扫描周期，一般均大于一个扫描周期甚至更长。
编程软件可以对可编程序控制器控制系统的硬件组态，即设置硬件的结构和参数，例如设置各框架各个插槽上模块的型号、模块的参数、各串行通信接口的参数等。在屏幕上可以直接生成和编辑梯形图、指令表、功能块图和顺序功能图程序，并可以实现不同编程语言的相互转换。可编程序控制器编程软件有调试和监控功能，可以在梯形图中显示触点的通断和线圈的通电情况，查找复杂电路的故障非常方便。历史数据可以存盘或打印，通过网络或Modem卡，还可以实现远程编程和传送。
用户存储器用户程序存储器——存放用户程序。即用户通过编程器输入的用户程序。
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AMAT 0140-00769 Harn. Ass., DCell B Digital Pneumatic, Harness, Assembly
Asyst 4002-6446-01 A, 9701-2143-01 wafer mapper, assembly, FRU, OPT, 3200-1229
MITSUBISHI: MOTION ConTROLLER Q172CPUN
Sun Hydraulics CXID-XAV Check Valve Cartridge T-18A
MILLER ELECTRIC 70 SERIES 24V 50/60HZ SINGLE WIRE FEEDER S-74DX 99819
General Signal, Tempress 92697 Front Panel LED Distribution Board Assy, 398979
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SCIENTIFIC COLUMBUS XL31K5PAN7-4-SC EXCELTRonIC WATT TRANSDUCER 120V-AC D521980
ALLEN BRADLEY 800H-2HZ4R 2 HOLE PUSHBUTTON ENCLOSURE SER B D521674
SMC SYJ7120-5LOZ 24V-DC 1/8 IN NPT SOLENOID VALVE D504222
ROSEMOUNT 3051TG3A2B21AB4C6M5C1 42.4V-DC 0-80PSI PRESSU
W458 Siemens Sinumerik System 8 Bedienfeld MS401A E:02
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CUTLER HAMMER 240V 200A SAFETY SWITCH 4144H444
Lambda LLS6008 Regulated Power Supply, 397730
KLOCKNER MOELLER PKZM 1-6 4-6A MANUAL MOTOR STARTER
US MOTORS F592 TYPE PF TEFC 1/2HP 230/460V-AC 1140RPM F56 3PH MOTOR D519622
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WESTINGHOUSE 743A301 G02 3HS1 INPUT MODULE D465638
WRIGHT 9960 6PT 1-7/8 IN SOCKET 1IN DRIVE D519952
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16 AMAT 3700-02659 ORING ID .362 CSD .103 Silicone 70Duro
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electroglas PCB ASSY, PREALIGN, MOD, I/F 033460124
SOLA 63-23-150-8 500VA 240VAC ConSTANT VOLTAGE TRANSFORMER
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MAC 275B-781JJ 24V-DC 1/4 IN NPT SOLENOID VALVE D36
POLYCOM IPOWER 9000 VIDEO ConFERENCING SYSTEM D513372
SOLA GLS-04-110 100-240V-AC 24V-DC 110W 4.5A AMP POWER SUPPLY D507054
D171_174 Siemens SPS S5 6ES5420-4UA11 6ES5 420 4UA11
STAINLESS ROTARY LOBE PUMP CASING D504939
EATON MVX010A0-4 MVX9000 10HP 0-480V 18A SENSORLESS VEC
AMAT 0020-31147 Insert, base, Aluminum, 150/200MM Flat, 401779
Novascan 420, Nova 210-480001-01, AMAT 0650-01111 S/N 2050
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OKUMA PPS-60C E4809-747-005-E, OKUMA TH604A SERVO DRIVE
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MKS 625B23TCEFU Capacitance Manometer 2000 Torr, in sealed bag, sell as used
SCHMERSAL SRB301MC SAFETY ConTROLLER RELAY NEW!!
SPROUT BAUER BAUERLITE CENTRI-CLEANER LIQUID CYCLONE ASSEMBLY D462347
MOORE SCT 117V-AC SIGNAL ConVERTER D511319
WRIGHT 8872 6PT 2-1/4 IN SOCKET 1IN DRIVE D519951
SALINA VORTEX S13-WS1-RS-05 DIVERTER VALVE UPPER SEAL 1
ON46 Siemens 6RB2030 0FA00 447 703.9050.00-F
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Aera R0-40 Flow Controller 402221
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REXNORD 615548 THOMAS FLEXIBLE DISC COUPLING 375.S71.CMBRA C=8.58 D522730
Turbines Inc. FML250 Liquid Flow Monitor
PRODUCTION PROCESS ELAPSED TIME DISPLAY, ET2-M
Ultra Fab Technologies, UFT 46-20 Remote, Touch Panel, U/S
VAC CUBES 32L 1/4 IN 3/8 IN VACUUM PUMP D448107
SQUARE D LAF3640036MV1021 3P 400A LA11021 SHUNT TRIP CIRCUIT BREAKER D472871
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POWER-ONE HD24-4.8-A 4.8A AMP 120/240V-AC 24V-DC POWER SUPPLY D399215
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Y64 Sick VS/VE18-4P3440 Sender Empf?nger 14m 6013731 Neu
TAYLOR INSTRUMENT 5235-LIC-44 INDICATING ConTROLLER 117V-AC D363462
GENERAL ELECTRIC GE 5K49MN6079 K159 1/2HP 230/460V 1140
2 TEL TYB41Z-1/PC Interface pcb, tokyo electron 1D81-000396-12 PCB board
Kensington Labs 4610-0000-01 SBC Rev K.1 Board
LEUZE MA 3 3000 / 50029719 18-36V DC ! NEW IN BOX !
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NICKSON 2IN HDGM MUFFLER CLAMP D502815
NORGREN B08-396M3MA 250PSI 3/8 IN NPT PNEUMATIC FILTER-REGULATOR D505136
PC 1030-140A 0385 PCB CIRCUIT BOARD D466300
DD83 Bosch E24V Input 047981-107401
NEXEN MB-450S 801300 SPRING SET BRAKE 300LB-IN D502946
EMERSON MSC-050 810430-50 50 FOOT SERVO CABLE D407215
10 AMAT 3300-06881 Fitting Mini Plug 1/4-28 UNF TFE
NEW PCB board assy TEL 260-56110-01 servo amplifier, 260-56110-AB
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Dynapar Danaher Controls M060174 62-PMDF-0600-AB Rotopulser Encoder
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SOLA ELECTRIC SDN2.5-24-100 POWER SUPPLY 24VDC 2.5 AMP, 115/230 VAC
SCHMERSAL AZR62A2/110VAC NEW! QUANTITY! SAFETY RELAY
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ARPAC 101994-008 STEEL IDLER ROLLER 26-1/8X2IN 1/2IN ID ConVEYOR D263406
WORCESTER ConTROLS RK44TBR17 1-1/4IN VALVE REPAIR K
WOODHEAD 1200650366 MICRO-CHANGE 4PIN FEMALE 4M CABLE-WIRE D506868
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LOT 21 DURABLE ENGRAVERS ASSORTED NUMERAL 6 1 metaL STAMP PUNCH D265257
AC Replacement, AC Plug/Computer Power Receptacle
KF40 Foreline With Bellows
SMC CG5EN100TNSR-125 PNEUMATIC 125MM STROKE 100MM B
Carlisle RBP88-4 Heavy Duty 3" Super-Vee Band Belt
THREAD CRAFT 1.5IN DIAMETER 40.75OAL PRECISION BALL SCREW T-3507 *NEW*
MKS, KF25 Manual Vacuum Isolation Valve, LPV1-25-AK-MNVN
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DRESSER 662141DB STAINLESS PUMP SHAFT SLEEVE D518914
WIKA 9021124 233.50.100 0-16BAR 1/2 IN NPT PRESSURE
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DG443 Siemens 6ES5431-4UA12 6ES5 431-4UA12 E1
NORGREN FU95 A 2A S1 S2 C4 2 RB3 POWER CLAMP PNEUMATIC
GENERAL ELECTRIC GE 139B3373G1 ConTACT COPPER
AMAT 0150-03313 Cable Assy, VME FEPC Floppy interface
tape 1"W-3402 Acrylic ADH Black POlyim 24-8014-8402 24-884-3402 20010013P524
REXNORD 815-23T 23TOOTH 1-7/16 IN DOUBLE ROW CONVEY
Brad Harrison 113022A01F1291 Woodhead L.P. Mini-Change Extension 3-pole
LITTELFUSE 1-1/2A 75-600VAC INDICATOR FUSE LOT OF 3 FLSR 1-1/2 ID 100882
Granville Phillips 352 Gauge Controller, 20352001
ALLEN-BRADLEY 1785-L40L/E PLC-5/40 PROCESSOR W/ 1785-ENET ETHERNET INTERFACE
TRW 12 NF RETHREADING 1-1/8 IN DIE D519872
LIGHTNIN 137551 LANTERN RING D522431
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