IS200VSCAH GE

TFX500 SIMPLEX GRINNELL PROFIBUS
G408-0001 SLIMPAK
M063-LE-507E SLO-SYN PROFIBUS PADP-V1
SC628AD SONALERT R8485
XCD-V50 SONY CCD -31.25kbit/
5136-PFB SST Eex ia/ib
5136-PFB-VME SST 1000
SEC-4400 STEC
IRH320-1000-203 SUMTAK PROFIBUS
5148-04 SUN
RS-520L SUNX –
M063-LE09 SUPERIOR

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描述

PLC在RUN工作模式时,执行一次图1-5所示的扫描操作所需的时间称为扫描周期,其典型值约为1~l00ms。扫描周期与用户程序的长短、指令的种类和CPU执行指令的速度有很大的关系。当用户程序较长时,指令执行时间在扫描周期中占相当大的比例。有的编程软件或编程器可以提供扫描周期韵当前值,有的还可以提供扫描周期的最大值和最小值。

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