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PLC的核心部件是CPU和存儲(chǔ)器：
（1）中央處理單元（CPU）
中央處理單元（CPU）是PLC 的控制中樞。它按照PLC系統(tǒng)程序賦予的功能，接受并存儲(chǔ)從編程器鍵入的用戶程序和數(shù)據(jù)，檢查電源、存儲(chǔ)器、I/O以及警戒定時(shí)器的狀態(tài)，并能檢查用戶程序的語法錯(cuò)誤。當(dāng)PLC投入運(yùn)行時(shí)，首先它以掃描的方式接受現(xiàn)場各輸入裝置的狀態(tài)和數(shù)據(jù)，并分別存入I/O映象區(qū), 然后從用戶程序存儲(chǔ)器中逐條讀取用戶程序，經(jīng)過命令解釋后按指令的規(guī)定執(zhí)行邏輯或算術(shù)運(yùn)算等任務(wù)。并將邏輯或算術(shù)運(yùn)算等結(jié)果送入I/O映象區(qū)或數(shù)據(jù)寄存器內(nèi)。等所有的用戶程序執(zhí)行完畢以后，后將I/O映象區(qū)的各輸出狀態(tài)或輸出寄存器內(nèi)的數(shù)據(jù)傳送到相應(yīng)的輸出裝置，如此循環(huán)運(yùn)行，直到停止運(yùn)行為止。
ALLEN BRADLEY 600V 30A 3 POLE TRAILER FUSE BLOCK 1494V-FSR633 SER A NIB
SICK 30-MGS LIGHT CURTAIN MGSS120-12
SCOTT SPEED-EVAC MOUTHBIT RESPIRATOR 90-AG NIB
FUSI ELECTRIC CIRCUIT PROTECTOR CP32FM/3
SALISBURY ELECRTICAL RUBBER GLOVES SZ 91/2 BLUE ANSI/ASTM D120 TYPE II NNB
HS 32 STAINLESS CLAMP W CARB SCREW QUANITY 19 NIB
SMC NVFS2200-5FZ SOLENOID VALVE DC21-26V NIB
SALISBURY ELECTRICAL GLOVES SZ 81/2 RED ANSI/ASTM D120 TYPE I NNB
MSA COMBINATION RESPIRATOR CARTRIDGE 491627 NNB
OHMITE D25K150 25 WATTS NIB
ALLEN BRADLEY DISCONNECT SWITCH HANDLE NNB
GENERAL ELECTRIC 30AMP 600V.AC MAX HP 20 HEAVY DUTY SWITCH N.P. 266209-G
CONTROL DEVICES 5A708, SEALED
YALE EMERGENCY BRAKE CABLE 901985804
KEYENCE SAFETY CURTAIN MUTING STATUS DISPLAY PANEL MOUNT NIB SL-R12D
PASS & SEYMOUR RDC-115032 NEMA L6-20 20A-250V BROWN RECEPTACLE NIB
SMC PORT LOCK OUT VALVE VHS40-03
SICK LIGHT CURTAIN MGSE120-12A
MSA FACESHIELD VISOR 472299
DBI/SALA 11FT SELF REACTING SAFETY HARNESS L3020 105158
DBI SALA 6FT EX STOP II TIE OFF ADAPTOR L967-6C
ALLEN BRADLEY DISCONNECT SWITCH 1494V-DS60 SERIES D NIB
ALLEN BRADLEY ILLUMINATED PUSH BUTTON 800T-PA16 SERIES T NIB
UNITED ELECTRIC PRESSURE SWITCH 3-30PSI 15 AMP 125/250VAC TYPE J54 MODEL 24
RAM METER 600V 50-400HZ 300:5 A RATIO CURRENT TRANSFORMER CAT 58 RBL-301
BRADY SIGNMARK DANGER SIGN 70249 105164
IFM EFECTOR100 IGS206 SWITCH IGB3008BAPKG/M/?US/104-DPO NIB
SICK 30-FGS SAFETY LIGHT CURTAIN SET FGSE 300-23 / FGSS 300-23 *NIB*
FUSI ELECTRIC CIRCUIT PROTECTOR CP32FM/5
ERIE MANUFACTURING CO. PORT-O-MATIC EMERGENCY OXYGEN 407A42
PATLITE CORPORATION 24V .6W PATLITE ALARM UNIT EB-24KA
TELEMECANIQUE 220V 7W BEACON STACK LIGHT, XVAC341, NIB
STI MiniSafe LONG RANGE MS4400 LIGHT CURTAIN EMITTER 42682-0240 / MS4424BX
THOMAS AND BETTS 600VAC 30A FUSIBLE HEAVY DUTY SAFETY SWITCH HD361-TB
PINNACLE MICROGUARD LIGHT CURTAIN RECEIVER MC-36-OF-AU
TOL-O-MATIC RKBC3#239864 & TOL-O-MATIC 34159019 REPAIR KIT NIB
LITTELFUSE 600V 30A LPSJ30-3 CLASS J FUSEHOLDER NNB
MSA DEFENDER AND FACESHIELD
PEPPERL+FUCHS INTRINSICALLY SAFE BARRIER KHZ-922/EX-1 P/N 92732
POWER ONE 160V 24VD AT 3.6AMPS HN24-3.6-A POWER SUPPLY
STI * MICRO SAFE TRANSMITTER * MO47SR-20-900-X
ALLEN BRADLEY 24VAC/VDC 7W STEADY LED STACK LIGHT, 855T-B24TL7 SER. C
TELEMECANIQUE GREEN SAFETY STACK LIGHT NIB XVB C33 / 084506
SIEMENS SYSTEMS 3 SUPPLEMENTARY RELAY MODULE SR-32 NIB
ALLEN BRADLEY DISCONNECT SWITCH HANDLES
NUMATICS 153SS615M000061 SOLENOID VALVE 24VDC 150PSIG-AIR NIB
SCC 24VDC LED-STACK LIGHT, NNB
SUNX SAFETY LIGHT CURTAIN RECEIVER SF2-EH56D DEMAGE ON LENS
SICK 30-MGS 52" SAFETY LIGHT CURTAIN 30-MGSE120-12B
TELEMACANIQUE ELECTRIC RED LIGHT
TELEMECANIQUE SCHNEIDER ELECTRIC GREEN SIGNAL LIGHT XVB C33
EDWARDS * 120V 30A 60HZ ADAPTABEACON SIGNAL LAMP ASSEMBLY * 52A-N5-40W
SQUARE D HEAVY DUTY SAFETY SWITCH 60A 600VDC H362AWK W/ RECEPTACLE JFC6
ALLEN BRADLEY 24VC AMBER SRACK LIGHT 855E-24GL5 SERIES A
SALISBURY ELECRTICAL RUBBER GLOVES SZ 101/2 BLUE ANSI/ASTM D120 TYPE II
SALISBURY ELECRTICAL RUBBER GLOVES SZ 81/2 BLUE ANSI/ASTM D120 TYPE II
GE FLEX-A-PLUG 60A 600VAC 3P DEL-362
THE PROTECTOSEAL CO. VACUUM RELIEF VENT C19542PF3/0069
EDWARDS ADAPTABEACON SIGNALING APPLIANCE 120V 60Hz 0.1A 92R-N5
ROBERTSHAW CONTROL PANEL BOARD N100-781046 N
ENCON 503Q PROTECTIVE GOGGLE HIGH IMPACT CHEMICAL SPLASH GOGGLE 500 SERIES
DBI SALA FULL BODY HARNESS 1103875
RTC SAFETY HARNESS 2008-RETRACTOR LIFELINE
TORK TURN-LOCK MOUNTING DELAYED RESPONSE PHOTOCONTROL 105-130V 50/60HZ 5001M NIB
FEDERAL SIGNAL FB2PST FIREBALL II LIGHT, NNB
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