s7300 stl编程 S7-300 S7-400语句表(STL)编程手册1-50.doc

s7300 stl编程 S7-300 S7-400语句表(STL)编程手册1-50 前言 viii 　 目录 前言…………………………………………………………………………………………………...iii 目录…………………………………………………………………………………………………..ix 1 位逻辑指令…………………………………………………………………………………….1-1 1.1 位逻辑指令概述......................................................................................1-1 1.2 A “与”.................................................................................................1-3 1.3 AN “与非”...........................................................................................1-4 1.4 O “或”.................................................................................................1-5 1.5 ON “或非”...........................................................................................1-6 1.6 X “异或”...........................................................................................1-7 1.7 XN “异或非”........................................................................................1-8 1.8 O 先“与”后“或”...................................................................................1