ZIgZag Step simple program example

That depends entirely on what brand and model robot you're using.

Your question is not at all clear. My guess is that you want to draw a rectangle at some height, then increment up and do it again, until reaching a height of 3 feet. Here is the offset path for the first rectangle.

MoveL Offs(pYourRobtarget,0,0,0),v100,fine,tUserTool0;

MoveL Offs(pYourRobtarget,0,1000,0),v100,fine,tUserTool0;

MoveL Offs(pYourRobtarget,10,1000,0),v100,fine,tUserTool0;

MoveL Offs(pYourRobtarget,10,0,0),v100,fine,tUserTool0;

MoveL Offs(pYourRobtarget,0,0,0),v100,fine,tUserTool0;

You can achieve your desired behavior by simply repeating these lines, with incrementally larger values in the Z field.

If your goal is to achieve the described behavior with as few lines as possible, then you could put this sequence in a FOR loop or a WHILE loop. You could then increment either the original robtarget's Z position, or the workobject's Z definition, until the Z reaches some desired height, at which point it would be reset.

PROC your_proc()

VAR num Offset:=0;

VAR num Increment:=10;

VAR num TotalDistance:=1000

While Offset < TotalDistance DO

MoveL Offs(pYourRobtarget,Offset,0,0),v100,fine,tUserTool0;

MoveL Offs(pYourRobtarget,Offset,1000,0),v100,fine,tUserTool0;

Offset:=Offset+Increment;

MoveL Offs(pYourRobtarget,Offset,1000,0),v100,fine,tUserTool0;

MoveL Offs(pYourRobtarget,Offset,0,0),v100,fine,tUserTool0;

Offset:=Offset+Increment;

ENDWHILE

Offset:=0;

ENDPROC

what track movement?

Yeah, adding another While loop that uses a second robtarget would work. That way you don't have to worry about the track being jerky as you try to increment the track position.

I'm not aware of a way to have the track move at a smooth speed down the rail while the robot is executing paths.

The command EOffsSet might do the trick.