DS200SDCCG4AFD GE

2150ES ARCHIVE
H117AL112F1 ASCO
SB-700 ASYST
AD-27 ATKINSON DYNAMICS
TC-4000-P-ES ATLAS
T1F-08AD-1 AUTOMATION
AVME-115A AVAL DATA
M8000R-SUP AVAYA
AT-MC15 Allied Telesyn
TC-4000-P-PB-ES Altas Copco
VB-430 B&K Vibro
2BM100.9 B&R

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描述

PLC运行正常时,扫描周期的长短与用户应用程序的长短、CPU的运算速度、I/O点的情况等有关。通常用PLC执行1KB指令所需时间来说明其扫描速度(一般1-10ms/KB)。值得注意的是,不同指令执行时间是不同的,故选用不同指令所用的扫描时间将会不同。若用于高速系统要缩短扫描周期时,可从软硬件上同时考虑。PLC周期性循环扫描工作方式的显著特点是:可靠性高、抗干扰能力强,但响应滞后、速度慢。

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