StructAxesTOs :STRUCT
Pos_Axis :ARRAY[1..2] OF posaxis := [2(TO#NIL)];
Following_Axis :ARRAY[1..2] OF followingAxis := [2(TO#NIL)];
External_Encoder :ARRAY[1..2] OF externalEncoderType := [2(TO#NIL)];
Following_Object :ARRAY[1..2] OF followingObjectType := [2(TO#NIL)];
Printmark :ARRAY[1..2] OF measuringInputType := [2(TO#NIL)];
END_STRUCT;


事例中设定结构变量时，默认值[2(TO#NIL)]什么意思？


SyncPosBuffer :STRUCT
SyncPos :ARRAY[0..SPB_max] OF LREAL;
SP_read :ARRAY[0..SPB_max] OF BOOL;
SP_entered :ARRAY[0..SPB_max] OF BOOL;
END_STRUCT;

数组变量的数量在ST中可以用变值表示，在mcc中是否可以？
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