1756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM7171756-HSC@AB@模块@IC697MEM717

用户程序通过编程器顺序输入到用户存储器，CPU对用户程序循环扫描并顺序执行，这是PLC的基本工作过程。

     当PLC运行时，用户程序中有众多的操作需要去执行，但是CPU是不能同时去执行多个操作的，它只能按分时操作原理，每一时刻执行一个操作。但由于CPU运算处理速度很高，使得外部出现的结果从宏观来看似乎是同时完成的。这种分时操作的过程，称为CPU对程序的扫描（CPU处理执行每条指令的平均时间：小型PLC如OMRON-P系列为10μs、中型PLC如FANUC-PLC-B为7μs）。

     PLC接通电源并开始运行后，立即开始进行自诊断，自诊断时间的长短随用户程序的长短而变化。自诊断通过后，CPU就对用户程序进行扫描。扫描从0000H地址所存的第一条用户程序开始，顺序进行，直到用户程序占有的最后一个地址为止，形成一个扫描循环，周而复始。顺序扫描的工作方式简单直观，它简化了程序的设计，并为PLC的可靠运行提供了保证。一方面所扫描到的指令被执行后，其结果马上就可以被将要扫描到的指令所利用。另一方面还可以通过CPU设置扫描时间监视定时器来监视每次扫描是否超过规定的时间，从而避免由于CPU内部故障使程序执行进入死循环而造成的故障。

6FC4801-1AY00-4AU2
6FC4801-1AY52-4AA0
6FC4801-1AY52-4AU3
6FC4801-1AY54-4AA0
6FC4801-1AY54-4AU3
6FC4801-1AY56-4AA0
6FC4801-1AY56-4AU3
6FC4801-2AA00-4AA1
6FC4801-2AA00-4AU2
6FC4801-2AA23-4AA0
6FC4801-2AA23-4AU3
6FC4801-2AB00-4AA1
6FC4801-2AB00-4AU2
6FC4801-2AB22-4AA0
6FC4801-2AE00-4AA1
6FC4801-2AE00-4AU2
6FC4801-2AE13-4AA0
6FC4801-2AF00-4AA1
6FC4801-2AF00-4AU2
6FC4801-2AF13-4AA0
6FC4801-2AH00-4AA1
6FC4801-2AH00-4AU2
6FC4801-2AH13-4AA0
6FC4801-2AK00-4AA1
6FC4801-2AK00-4AU2
6FC4801-2AK14-4AA0
6FC4801-2AK14-4AU3
6FC4801-2BJ00-4AA1
6FC4801-2BJ00-4AU2
6FC4801-2BJ13-4AA0
6FC5012-0CA02-0AA0
6FC5095-0AA10-0AP1
6FC5095-0AA30-0YP0
6FC5095-0AA40-0YG3
6FC5095-0AA50-0AP0
6FC5095-0AA50-0AP1
6FC5095-0AA50-0BP0
6FC5095-0AA50-0BP1
6FC5095-0AA50-0CP1
6FC5095-0AA50-0YG0
6FC5095-0AA51-0YG0
6FC5095-0AA60-0AP1
6FC5095-0AA60-0BP1
6FC5095-0AA60-1AP1
6FC5095-0AA60-1BP1
6FC5095-0AA71-0BG0
6FC5095-0AA71-0CG0
6FC5095-0AA71-0DG0
6FC5095-0AA71-0EG0
6FC5095-0AA80-0AP0
6FC5095-0AA80-0BP0
6FC5095-0AA80-0YG0
6FC5095-0AA81-0YG0
6FC5095-0AB00-0AP0
6FC5095-0AB00-0AP1
6FC5095-0AB00-0BG0
6FC5095-0AB00-0BP0
6FC5095-0AB00-0BP1
6FC5095-0AB00-0CG0
6FC5095-0AB00-0CP1
6FC5095-0AB00-0DG0
6FC5095-0AB00-0DP1
6FC5095-0AB00-0EG0
6FC5095-0AB00-0EP1
6FC5095-0AB00-0RP1
6FC5095-0AB00-0YG0
6FC5095-0AB00-1AP1
6FC5095-0AB00-1BP1
6FC5095-0AB00-1CP1
6FC5095-0AB00-1DP1
6FC5095-0AB00-1EP1
6FC5095-0AB00-1RP1
6FC5095-0AB10-0AP0
6FC5095-0AB10-0BP0
6FC5095-5AA71-1BG0
6FC5095-5AA71-1CG0
6FC5095-5AA71-1DG0
6FC5095-5AA71-1EG0
6FC5100-0AA01-0AA1
6FC5100-0AB01-0AA1
6FC5100-0AB02-0AA0
6FC5101-0AA01-0AA0
6FC5101-0AB01-0AA0
6FC5101-0AB02-0AA0
6FC5103-0AB01-0AA2
6FC5103-0AB03-0AA3
6FC5103-0AB03-1AA3
6FC5103-0AC01-0AA0
6FC5103-0AD01-0AA0
6FC5103-0AD03-0AA0
6FC5103-0AD20-0AA0
6FC5103-0AE01-0AA1
6FC5103-0AE01-1AA1
6FC5110-0BB01-0AA2
6FC5110-0BB04-0AA1
6FC5110-0CB01-0AA0
6FC5110-0DB02-0AA2
6FC5110-0DB02-0AA4
6FC5110-0DB03-0AA3
6FC5110-0DB03-0AA4
6FC5111-0BA00-0AA0
6FC5111-0BA01-0AA0
6FC5111-0BA06-0AA0
6FC5111-0BA60-0AA0
6FC5111-0CA01-0AA0
6FC5111-0CA02-0AA2
6FC5111-0CA03-0AA2
6FC5111-0CA04-0AA0
6FC5111-0CA05-0AA0
6FC5111-0CA70-0AA0
6FC5111-0CA73-0AA1
6FC5111-0CB01-0AA0
6FC5111-0CB02-0AA0
6FC5112-0CA02-0AA0
6FC5112-0CA03-0AA0
6FC5112-0DA01-0AA1
6FC5112-0EA01-0AA0
6FC5112-0EA02-0AA0
6FC5112-0EA03-0AA0
6FC5114-0AA01-1AA0
6FC5114-0AA02-0AA2
6FC5114-0AB01-0AA1
6FC5135-0AA01-0AA0
6FC5147-0AA00-0AA0
6FC5147-0AA03-0AA0
6FC5147-0AA04-0AA0
6FC5147-0AA07-0AA1
6FC5147-0AA12-0AA0
6FC5147-0AA13-0AA0
6FC5147-0AA13-0AA1
6FC5147-0AA14-0AA2
6FC5147-0AA15-0AA1
6FC5147-0AA18-0AA0
6FC5147-0AA20-0AA0
6FC5147-0AA23-0AA0
6FC5147-0AA25-0AA0
6FC5148-0AA01-0AA0
6FC5148-0AA03-0AA0
6FC5148-0AA13-0AA0
6FC5148-0AA14-0AA0
6FC5148-0AA17-0AA0
6FC5148-0AA18-0AA0
6FC5148-0AA20-0AA0
6FC5148-0AC01-0AA1
6FC5148-0AC01-0AA2
6FC5150-0AA01-0AA0
6FC5150-0AA11-0AA0
6FC5150-0AA41-0AA0
6FC5150-0AA61-0AA0
6FC5150-0AB01-0AA0
6FC5150-0AB21-0AA0
6FC5150-0AC10-0AA0
6FC5150-0AC11-0AA0
6FC5150-0AC20-0AA0
6FC5150-0AC21-0AA0
6FC5150-0AC22-0AA0
6FC5150-0AC30-0AA0
6FC5150-0AC31-0AA0
6FC5150-0AC32-0AA0
6FC5150-0AC41-0AA0
6FC5150-0AD01-0AA0
6FC5150-0AD02-0AA0
6FC5150-0AD03-0AA0
6FC5150-0AD04-0AA0
6FC5150-0AD05-0AA0
6FC5150-0AD06-0AA0
6FC5150-0AE01-0AA0
6FC5150-0AE02-0AA0
6FC5150-0AH01-0AA0
6FC5150-0AH02-0AA0
6FC5150-0AH03-0AA0
6FC5150-0AH04-0AA0
6FC5150-0AJ01-0AA0
6FC5150-0AK01-0AA0
6FC5150-0AS01-0AA0
6FC5150-0AS03-0AA0
6FC5150-0AS04-0AA0
6FC5150-0AS05-0AA0
6FC5150-0AS06-0AA0
6FC5150-0AS10-0AA0
6FC5150-0AS15-0AA0
6FC5150-0AS20-0AA0
6FC5150-0AS25-0AA0
6FC5150-0AS30-0AA0
6FC5150-0AS31-0AA0
6FC5150-0AS35-0AA0
6FC5150-0AS40-0AA0
6FC5150-0AS45-0AA0
6FC5150-0AS50-0AA0
6FC5150-0AX01-3AE0
6FC5150-0AX01-3CE0
6FC5150-0AX01-3EE0
6FC5150-0AY01-3AE0
6FC5150-0AY01-3CE0
6FC5150-0AY01-3DE0
6FC5150-0AY01-3EE0
6FC5152-0AX01-2AA0
6FC5152-1BX01-3AE0
6FC5152-2AX01-1AA0
6FC5153-0AX01-2AF0
6FC5154-0AX01-0AE0
6FC5154-0AX01-1AE0
6FC5154-0AX02-1AE0
6FC5158-0AX01-0AD1
6FC5158-0AX01-0AF0
6FC5158-0AX01-0AU2
6FC5158-0AX01-0FD1
6FC5158-0AX01-0HD1
6FC5158-0AX01-0JD1
6FC5158-0AX01-0KD1
6FC5158-0AX01-0ND1
6FC5158-0AX01-0PD1
6FC5158-0AX01-0QD1
6FC5158-0AX01-0SD1
6FC5158-0AX01-0TD1
6FC5158-0AY01-0AD1
6FC5158-0AY01-0AF0
6FC5158-0AY01-0AU2
6FC5158-0BX01-0AF0
6FC5158-0BX01-0AU2
6FC5158-0BX01-0FD1
6FC5158-0BX01-0KD1
6FC5158-0BX01-0TD1
6FC5158-0BY01-0AF0
6FC5158-0BY01-0AU2
6FC5158-0CX01-0AD1
6FC5158-0CX01-0TD1
6FC5158-0CY01-0AD1
6FC5158-2AY01-3AF0
6FC5158-3AX01-1FF0
6FC5158-3AX01-1QF0
6FC5158-3AX01-2PF0
6FC5158-3AX01-7AF0
6FC5158-3AX11-2AF0
6FC5158-3AY11-1AF0
6FC5158-3AY11-2AF0
6FC5158-4AX01-4FF0
6FC5158-4AX01-4HF0
6FC5158-4AX01-4KF0
6FC5158-4AX01-4PF0
6FC5158-4AX01-4QF0
6FC5158-4AX01-8AF0
6FC5158-4AY01-8AF0
6FC5158-4BX01-8AF0
6FC5158-4BX01-8AU3
6FC5158-4BX01-8FF0
6FC5158-4BX01-8KF0
6FC5158-4BX02-8KU3
6FC5158-4BY01-8AF0
6FC5158-4BY01-8AU3
6FC5158-4CX01-8AF0
6FC5158-4CX01-8TF0
6FC5158-4CY01-8AF0
6FC5158-5AX01-4FF0
6FC5158-5AX01-4HF0
6FC5158-5AX01-4KF0
6FC5158-5AX01-4PF0
6FC5158-5AX01-4QF0
6FC5158-5AX01-4SF0
6FC5158-5AX01-4TF0
6FC5158-5AX01-6FF0
6FC5158-5AX01-6HF0
6FC5158-5AX01-6KF0
6FC5158-5AX01-6PF0
6FC5158-5AX01-6QF0
6FC5158-5AX01-6SF0
6FC5158-5AX01-6TF0
6FC5158-5AX01-7NF0
6FC5158-5AX01-8AF0
6FC5158-5AY01-8AF0
6FC5158-5BX01-7AU3
6FC5158-5BX01-7FF0
6FC5158-5BX01-7KF0
6FC5158-5BX01-8AF0
6FC5158-5BX01-8FF0
6FC5158-5BX01-8KF0