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PLC的核心部件是CPU和存储器：
（1）中央处理单元（CPU）
中央处理单元（CPU）是PLC 的控制中枢。它按照PLC系统程序赋予的功能，接受并存储从编程器键入的用户程序和数据，检查电源、存储器、I/O以及警戒定时器的状态，并能检查用户程序的语法错误。当PLC投入运行时，首先它以扫描的方式接受现场各输入装置的状态和数据，并分别存入I/O映象区, 然后从用户程序存储器中逐条读取用户程序，经过命令解释后按指令的规定执行逻辑或算术运算等任务。并将逻辑或算术运算等结果送入I/O映象区或数据寄存器内。等所有的用户程序执行完毕以后，{zh1}将I/O映象区的各输出状态或输出寄存器内的数据传送到相应的输出装置，如此循环运行，直到停止运行为止。
（2）存储器
与微型计算机一样，除了硬件以外，还必须有软件。才能构成一台完整的PLC。PLC的软件分为两部分: 系统软件和应用软件。存放系统软件的存储器称为系统程序存储器。
PLC存储空间的分配：虽然大、中、小型 PLC的CPU的{zd0}可寻址存储空间各不相同，但是根据PLC的工作原理， 其存储空间一般包括以下三个区域：系统程序存储区，系统RAM存储区（包括I/O映象区和系统软设备等）和用户程序存储区。CONTEC SBC,PC,SPI-8451-LLVA 7850, CPU BOARD TESTED WORKING
NIDEK IM12-CM1 COMMUNICATION BOARD 53695-PC2881A,53695-BA01A,53695-PC2881B
INDUSTRIAL SBC,PC,IPC,NEAT-590,TILLAMOOK-MMX CPU AT 266MHZ COMPUTER BOARD TESTED
FAST RICE-001A BOARD P-900210
INDUSTRIAL SBC,PC,IPC,PCA-6186E2 COMPUTER BOARD INTEL PENTIUM[R]4,CPU 2.80GHZ #1
AITEC ROBOT CONTROLLER BOARD AI-SIO-1616[3PCS],NOP OM-2 AI-SPG-4,AI-CONT-A
HITACHI ZOSEN BOARD HIMV-134 B,HIMZ1340
CAMTEK PC-CIOC P/N:PC0017200 BOARD SA9011604
PHOENIX SBC,PC,IPC, INDUSTRIAL COMPUTER,SBC81205,FULL-SIZE PENTIUM 4-775 CPUCARD
INDUSTRIAL SBC,PC,IPC,PCA-6186 B2,PCA-6186E2,COMPUTER P-4,CPU:2.00GHZ WORKING
#0012 INDUSTRIAL SBC,PC,IPC, 4B03AN 2.1 TESTED WORKING
KLA INSTRUMENTS SINGLE AXIS CONTROLLER BOARD 710-652010-20
TOKYO TOSOKU KOGYO K331616 024,NOVA BA00321,MC3400,NOVA BA00322,I/F MC3400,BOARD
INDUSTRIAL SBC,PC,IPC,SBC81826-RC REV:B1,P-4 CPU 3.00GHZ COMPUTER WORKING
SBS TECHNOLOGIES VIPC616 FAB 0360-1152D BOARD
SBS GREENSPRING COMPUTERS VIPC616 REV C2 FAB 0360-1152 C2 BOARD
FANUC BOARD A16B-2202-0774/03B,A320-2202-T774/01
GB BACHMANN STU 500E 2622/00 & STU 500U 2623/00 BOARD STU 500.02
NIDEK IM12-MB1 BOARD 54430-PC2879A ANA 54430-BA04A,54430-PC2879B
SIEMENS 462018.7950.53 BOARD & 462018.7600.51
DENSEI BCC 2600,INTERFACE CONTROLLER BCC2600,POWER SUPPLY BCV5080[2PCS]
KLA 8100 PCB BOARD,METRABUS 32 CHANNEL RELAY OUTPUT BD PC6702
GE Fanuc IC600 PM507L RPU Power Supply
NATIONAL NI PXI-6040E MULTIFUNCTION I/O 12BIT BOARD,184359B-01
BAILEY CONTROLS INFI 90 IMMFP01 BOARD J9961001E1 NEW NOT IN BOX
KLA INSTRUMENTS BOARD 710-650074-20
SIEMENS SMP16-EA217 6AR1302-0AE00-0AA0 BOARD J31070-A4957-F004-B1-85
INDUSTRIAL SBC,PC,IPC,MITAC MSC-3685A,COMPUTER BOARD,INTEL,P-III 1.0B GHZ TESTED
GB BACHMANN UTR 300 BOARD UTU 1 ,UTI 06 F1,UTR 06 F1
NIDEK IM12-MB1 X SERVO BOARD 54430-PC2876A 54430-BA01A,54430-PC2876B
NIDEK IM12-MB1 Y SERVO BOARD 54430-PC2876A 54430-BA01A,54430-PC2876B
NATIONAL MULTIFUNCTION DAQ DEVICE BOARD NI PCI-6259,190996F-01L
KAIJO MOS MPU-202 233477A & ISC-102 233482 1/4~4/4 BOARD
GB BACHMANN BOARD CC11/3,3522/00 & KOP 500 U,KOP 500.100.E
INDUSTRIAL SBC,PC,IPC,PCA-6186 REV:A1,PCA-6186E2 COMPUTER P-4,CPU:2.66GHZ WORKIN
BROOKS TIC PROF BOARD 921-070,SST 5136-PFB-VME #2
INDUSTRIAL SBC,PC,IPC MSC-3685A, P-III,CPU 1.0B GHZ COMPUTER BOARD WORKING
MEI MOTION CONTROLLER V6U/DSP REV:2 BOARD
SIEMENS TELEPERM M 6DS1703-8RR,C79040-A6422-C403-02-86,BOARD #2
SAMSUNG 4 AXIS BSC BOARD SRCP-BBC4 RA41-00054A & I/O BOARD RA41-00017A
INDUSTRIAL SBC,PC,IPC,SBC81825,PCA6184VE5001-T CPU 2.77GHZ BOARD WORKING
HP AGILENT E8491B,HP 75000 SERIES C IEEE-1394 PC LINK TO VXI WORKING
INDUSTRIAL SBC,PC,IPC ROBO-679 COMPUTER CPU BOARD TESTED WORKING
YASKAWA JAPMC-MC2100 CONTROLLER BOARD
YASKAWA JAPMC-MC2100 BOARD DF0200548-A1
KLA 8100 PCB BOARD,METROLOGIX,JUNCTION BOARD
ADLINK MOTION CONTROLLER BOARD PCI-8164 51-12406-0A3,I/O BOARD,CABLE WORKING
VMIC VMEBUS BOARD VMIVME 6015,ASSY:332-0006015-000P TESTED WORKING
INDUSTRIAL SBC,PC,IPC,IBASE IB800-16,IB800-G2-1106 P-4,CPU:1.60GHZ WORKING
SIEMENS CPU 928B BOARD 6ES5928-3UB21
JEOL SP000937-01 MS CONT-PB BOARD & SP000869-00 DI CONT-PB & SP000879-01 LNS-PB
BAILEY CONTROLS BOARD IEPAF02 infi 90 NEW NOT IN BOX
BAILEY CONTROLS BOARD IMASM02 infi 90 NEW NOT IN BOX
INDUSTRIAL SBC,PC,IPC,PCA-6194VG TESTED WORKING
GSI GENERAL SCANNING LASER SERVO INTERFACE 229.017.01,222.033.00,229-060-00 PCB
KLA TENCOR INSTRUMENTS CONTROL PANEL II,SFS75 220663
CPU BOARD TACHIBANA TECTRON TVME 1004B
TEL TYB121-1/COM-PF, 1D08-000092-13 PCB BOARD
SEREN IPS BOARD 1400390000 REV C,4600780001,440119000,1400950000,4601170000 T3
OMRON SAFETY NETWORK CONTROLLER NE1A-SCPU01-V1
MOTOROLA MVME2604 712 I/O BOARD,01-W3191F 21A,01-W3341F 04E,84-W8341F01A
INDUSTRIAL SBC,PC,IPC,SBC81205 COMPUTER BOARD,PENTIUM DUAL-CORE CPU WORKING #3
TEL TOKYO BOARD SW300B/GAS 14,3M80-001595-11
INSTRON A1721-1033 REV. L,1721-1033 RING MAIN PACK CONTROL
INDUSTRIAL SBC,PC,IPC ACH-525VL/64-300,CPU 300 MHZ COMPUTER BOARD WORKING
SAMSUNG ROBOT CONTROLLER BOARD CSDA-XXXXB2 RA41-00056A
NOVOTRON GMBH NOVODRIVE ND21-5605KS-011-01
SEREN IPS 1401081000 REV D,440156100 2F,4601321000 BOARD
TOB1093 CHEMICAL I/O BOARD 02A,CPC-T0081A-12,100-T0082A-12,P11070074
SIEMENS BOARD 6FX1123-1CC01,6FR2820-0AA01-3C
NIDEK IM12-MB1 CRT CONT BOARD S1717-PC2770A,S1717-PC2770B
RVSI ACUITY CIMATRIX BOARD 070-200000 REV C,070-204000 REV E,045-204000 WORKING
YOKOGAWA POWER SUPPLY F3PU20, SP20-0N, XD64-3N, YD64-1A(3) BASE F3BU09 PLC
ADLINK MOTION CONTROLLER BOARD PCI-8164,51-12406-0A3 WORKING
MOTOROLA MVME2604 712 I/O BOARD,01-W3191F 21A,01-W1713B17D,84-W8341F01A
8122 284 3662 BOARD,D001183,SBIP 2-1 0120,8122 284 6987.2,8122 284 6977.2
VMIC VMEBUS BOARD VMIVME 2532A,ASSY:332-000113-427 TESTED WORKING
FAST VISION BOARD FVC06-1 P-900212 TESTED WORKING
