Structured Text Components: Comments
To make your structured text easier to interpret, add comments to it.
- Comments let you use plain language to describe how your structured text works.
- Comments do not affect the execution of the structured text.
To add comments to your structured text:
To add a comment | Use one of these formats |
on a single line | //comment (*comment*) /*comment*/ |
at the end of a line of structured text | |
within a line of structured text | (*comment*) /*comment*/ |
that spans more than one line | (*start of comment. . .end of comment*) /*start of comment. . .end of comment*/ |
For example:
Format | Example |
//comment | At the beginning of a line //Check conveyor belt direction IF conveyor_direction THEN... At the end of a line ELSE //If conveyor isn’t moving, set alarm light light := 1; END_IF; |
(*comment*) | Sugar.Inlet[:=]1;(*open the inlet*) IF Sugar.Low (*low level LS*)& Sugar.High (*high level LS*)THEN... (*Controls the speed of the recirculation pump. The speed depends on the temperature in the tank.*) IF tank.temp > 200 THEN... |
/*comment*/ | Sugar.Inlet:=0;/*close the inlet*/ IF bar_code=65 /*A*/ THEN... /*Gets the number of elements in the Inventory array and stores the value in the Inventory_Items tag*/ SIZE(Inventory,0,Inventory_Items); |
Provide Feedback