施耐德Unity_Pro结构化文本(ST)

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结构化文本语言

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施耐德Unity_Pro结构化文本(ST)

结构化文本（ST）

结构化文本

（ST） ....................................................................... .............................................................................. .. (1)

概

述 ........................................................................... .............................................................................. .......................... 2 一．结构化文本 ST简

介 ........................................................................... .. (3)

1.结构化文本 ST简

介 ........................................................................... .......................................................................... 3 2.操作

数 ........................................................................... .............................................................................. ................... 4 3.操作

符 ........................................................................... .............................................................................. ................... 5 二．指

令 ........................................................................... .............................................................................. (10)

1.指

令 ........................................................................... .............................................................................. ..................... 10 2.赋

值 ........................................................................... .............................................................................. ..................... 10 3.选择指令

IF…THEN…END_IF .............................................................

(11)

4.选择指令

ELSE ......................................................................... .............................................................................. ....... 12 5.选择指令

ELSE…THE N ................................................................... ...............................................................................

13 6.选择指令

CASE…OF…END_CASE ........................................................... ....................................................................... 13 7.

重复指令

FOR…TO…BY…DO…END_FOR ..................................................... ................................................................. 14 8.重复指

令

WHILE…DO…END_WHILE ......................................................... ................................................................... 15 9.重复

指令

REPEAT…UNTIL…END_REPEAT .................................................... ................................................................ 16 10.重复指

令 ........................................................................... .............................................................................. ........... 16 11. 子程序调

用 ........................................................................... .............................................................................. ..... 17 12.

RETURN ....................................................................... .............................................................................. ................. 17 13. 空指

令 ........................................................................... .............................................................................. ............. 17 14. 标签和跳

转 ........................................................................... .............................................................................. ..... 18 15. 注

释 ........................................................................... .............................................................................. ................. 18 三．调用基本功能、基本功能块、导出的功能块和过

程 ........................................................................... . (19)