1756-M3K/ABPLC智能制造
CPU主要由運算器、控制器、寄存器及實現它們之間的數據、控制及狀態總線構成，CPU單元還包括外圍芯片、總線接口及有關電路。內存主要用于存儲程序及數據，是PLC*的組成單元。
在使用者看來，不必要詳細分析CPU的內部電路，但對各部分的工作機制還是應有足夠的理解。CPU的控制器控制CPU工作，由它讀取指令、解釋指令及執行指令。但工作節奏由震蕩信號控制。運算器用于進行數字或邏輯運算，在控制器指揮下工作。寄存器參與運算，并存儲運算的中間結果，它也是在控制器指揮下工作。
CPU速度和內存容量是PLC的重要參數，它們決定著PLC的工作速度，IO數量及軟件容量等，因此限制著控制規模。
1.4 I/O模塊
PLC與電氣回路的接口，是通過輸入輸出部分（I/O）完成的。I/O模塊集成了PLC的I/O電路，其輸入暫存器反映輸入信號狀態，輸出點反映輸出鎖存器狀態。輸入模塊將電信號變換成數字信號進入PLC系統，輸出模塊相反。I/O分為開關量輸入（DI），開關量輸出（DO），模擬量輸入（AI），模擬量輸出（AO）等模塊。
1756-M3K/ABPLC智能制造
1756-GTWYS SUPT RENEWAL CONTRACT FOR 1756GTWY
1756-HSC 2 CHANNEL /4 OUTPUT HIGH SPEED COUNTER
1756-IA16 79-132 VAC INPUT 16PTS
1756-IA16I 79-132 VAC ISOLATED INPUT 16PTS
1756-IA8D VAC DIAGNOSTIC INPUT 8PTS
1756-IB16 VDC INPUT 16PTS
1756-IB16D VDC DIAGNOSTIC INPUT
1756-IB16I VDC ISLOTED INPUT 16PTS
1756-IB32 VDC INPUT 32PTS
1756-IC16 VDC INPUT 16PTS
1756-IF16 ANALOG INPUT-CURRENT/VOLTAGE 16PTS
1756-IF6I ISOLATED ANALOG INPUT-CURRENT/VOLTAGE 6PTS
1756-IF8 ANALOG INPUT-CURRENT/VOLTAGE 8PTS
1756-IH16I VDC ISOLOTED INPUT 16PTS
1756-IM16I VAC ISOLATED INPUT 16PTS
1756-IN16 VAC INPUT 16 PTS
1756-IR6I ISOLATED RTD INPUT 6PTS
1756-IT6I ISOLATED THERMOCOUPLE/MV INPUT 6PTS
1756-IV16 VDC SOURCING INPUT 16PTS
1756-L1 LOGIX5550 PROCESSOR, 64KBYTE USER MEMORY
1756-L1K CONFORMALLY COATED LOGIX 5550 PROCESSOR W/160KBYTE BASE MEMORY
1756-L1M1 LOGIX5550 PROCESSOR, 512KBYTE USER MEMORY
1756-L1M1K CONFORMALLY COATED LOGIX 5550 PROCESSOR W/512KBYTE BASE MEMORY
1756-L1M2 LOGIX5550 PROCESSOR W/ 1M BYTE EXPANSION MEMORY
1756-L1M2K CONFORMALLY COATED LOGIX5550 PROCESSPR W/1MBYTE EXPANSION MEMORY
1756-L1M3 LOGIX5550 PROCESSOR WITH 2MBYTE EXPANSION MEMORY
1756-L1M3K CONFORMALLY COATED LOGIX5550 PROCESSPR W/2MBYTE EXPANSION MEMORY
1756-M02AE 2-AXIS MOTION MODULE
1756-M08SE 1756 8 AXIS SERCOS SERVO MODULE
1756-M1 LOGIX5550 512KBYTE EXPANSION MEMORY
1756-M1K CONFORMALLY COATED LOGIX5550 EXPANSION MEMORY
1756-M2 LOGIX5550 1MBYTE EXPANSION MEMORY
1756-M2K CONFORMALLY COATED LOGIX5550 EXPANSION MEMORY
1756-M3 LOGIX5550 2MBYTE EXPANSION MEMORY
1756-M3K CONFORMALLY COATED LOGIX5550 EXPANSION MEMORY
1756-MVI CLX MULTI VEND INTF
1756-MVID MULTI-VENDR INTF DEV KIT
