621-0900 Honeywell UCN Operator Panel Inter Mod (621-0900)

MDS60A0040-5A3-4-04
3500/20-01-02-00
HP-E8460A
HP-E1412A
HP-E1466-66202
HMCP400R5
ha-600-1l-sp
AMM32T
ADM11T
ADM51T
AAR145-S50
ANB10D-425/CU2T/NDEL
XFR150-18
PC-1962B2
4000636 F 267
JAMSC-120DDO36410
1784PCM4
PCI内存反射卡 PCI 5565PIORC 个 1 PCI-5565PIORC-110000
1FK7032-5AK71-1UH3
IGP10-A22C1F-M1

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描述

“概念电流”或“能流”(PowerFlow)从左向右流动,这一方向与执行用户程序时的逻辑运算的顺序是一致的。能流只能从左向右流动。利用能流这一概念,可以帮助我们更好地理解和分析梯形图。图1-1a中可能有两个方向的能流流过触点5(经过触点1、5、4或经过触点3、5、2),这不符合能流只能从左向右流动的原则,因此应改为如图1-1b所示的梯形图。

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