4.1 User Program Types and Execution Timing
4.1.1 Ladder Programs
4-6
Execution Processing of Drawings
The drawings are executed by calling them from the top to the bottom, following the hierarchy
of the drawings. The following figure illustrates the execution processing of a high-speed scan
drawing (DWG.H).
Note: 1. The parent drawing is automatically called and executed by the system. Child drawings and grandchild
drawings are executed by calling them from a parent drawing or a child drawing using the SEE instruction.
2. You can call functions from any drawing. You can also call functions from other functions.
3. If an operation error occurs, the operation error drawing for the drawing type will be started automatically.
4. Always specify 00 as the drawing number for operation error drawings.
DWG.H
DWG.H01
H02
H00
DWG.H01.01
FUNC 01
SEE
H01
SEE
H02
END
END
END
END
END
END
SEE
H01.H01
FUNC
01
Functions
Execution is started by the
system program when the
execution condition is met.
Parent Drawing
Child Drawings
Grandchild Drawings
Execution is
automatically
started by the
system.
An operation
error occurs.