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结合PLC的组成和结构分析PLC的工作原理更容易理解。PLC是采用周期循环扫描的工作方式，CPU连续执行用户程序和任务的循环序列称为扫描。CPU对用户程序的执行过程是CPU的循环扫描，并用周期性地集中采样、集中输出的方式来完成的。一个扫描周期主要可分为：
（1）读输入阶段。 每次扫描周期的开始，先读取输入点的当前值，然后写到输入映像寄存器区域。在之后的用户程序执行的过程中，CPU访问输入映像寄存器区域，而并非读取输入端口的状态，输入信号的变化并不会影响到输入映像寄存器的状态，通常要求输入信号有足够的脉冲宽度，才能被响应。
ABPLC1756-L55M12
ABPLC1756-L55M13PLC
ABPLC1756-L55M14PLC
ABPLC1756-L55M16
ABPLC1756-L55M22PLC
ABPLC1756-L55M23
ABPLC1756-L55M24PLC
ABPLC1756-L61PLC
ABPLC1756-L61SPLC
ABPLC1756-L62PLC
ABPLC1756-L63PLC
ABPLC1756-L63SPLC
ABPLC1756-L63XTPLC
ABPLC1756-L64PLC
ABPLC1756-L65
ABPLC1756-L73PLC
ABPLC1756-L74
ABPLC1756-L75PLC
ABPLC1756-LSPPLC
ABPLC1756-M1PLC
ABPLC1756-M12PLC
ABPLC1756-M13PLC
ABPLC1756-M14PLC
ABPLC1756-M16PLC
ABPLC1756-M2PLC
ABPLC1756-M22PLC
ABPLC1785-L11BPLC
ABPLC1785-L20BPLC
ABPLC1785-L20EPLC
ABPLC1785-L26BPLC
ABPLC1785-L30BPLC
ABPLC1785-L40BPLC
ABPLC1785-L40CPLC
ABPLC1785-L40EPLC
ABPLC1785-L40LPLC
ABPLC1785-L46BPLC
ABPLC1785-L46C15
ABPLC1785-L60BPLC
ABPLC1785-L80B
ABPLC1785-L80CPLC
ABPLC1785-L80C15PLC
ABPLC1785-L80EPLC1747-L551
ABPLC1785-L86BPLC
ABPLC1747-L514PLC
ABPLC1747-L533PLC
ABPLC1747-L542
ABPLC1747-L543
ABPLC1747-L551PLC
ABPLC1747-L552PLC
ABPLC1747-L553PLC
ABPLC1747-L553PPLC
PLCPLC
ABPLC1756-L
ABPLC1756-L1M1
ABPLC1756-L1M2
ABPLC1756-L1M3
ABPLC1756-L55