IsFirstMastCycle：指示此循环是否为第一个 MAST 循环

功能描述

此功能在启动后的第一个 MAST 循环期间返回 TRUE。

若要查看 IL 或 ST 语言的一般表示形式，请参阅功能和功能块表示形式一章。

输出	类型	注释
IsFirstMastCycle	BOOL	启动之后的第一个 MAST 任务循环期间为 TRUE。

此示例介绍三个一起使用的功能 IsFirstMastCycle、IsFirstMastColdCycle 和 IsFirstMastWarmCycle。

请在 MAST 任务中使用此示例。否则，可能会运行多次或一次也不运行（在第一个 MAST 任务循环期间可能会多次调用或不调用某个附加任务）：

VAR
MyIsFirstMastCycle : BOOL;
MyIsFirstMastWarmCycle : BOOL;
MyIsFirstMastColdCycle : BOOL;
END_VAR

MyIsFirstMastWarmCycle := IsFirstMastWarmCycle();
MyIsFirstMastColdCycle := IsFirstMastColdCycle();
MyIsFirstMastCycle := IsFirstMastCycle();

IF (MyIsFirstMastWarmCycle) THEN

(*This is the first Mast Cycle after a Warm Start: all variables are set to their initialization values except the Retain variables*)

(*=> initialize the needed variables so that your application runs as expected in this case*)

END_IF;

IF (MyIsFirstMastColdCycle) THEN

(*This is the first Mast Cycle after a Cold Start: all variables are set to their initialization values including the Retain Variables*)

(*=> initialize the needed variables so that your application runs as expected in this case*)

END_IF;

IF (MyIsFirstMastCycle) THEN

(*This is the first Mast Cycle after a Start, i.e. after a Warm or Cold Start as well as STOP/RUN commands*)

(*=> initialize the needed variables so that your application runs as expected in this case*)

END_IF;