7.1 User Program Types and Execution Timing
7.1.1 Ladder Programs
7-6
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.
Execution i
s
s
tarted by the
s
y
s
tem program
when the execution condition i
s
met.
Parent Drawing
DWG.H
DWG.H01
H02
H00
DWG.H01.01
FUNC 01
Child Drawing
s
Grandchild Drawing
s
Function
Execution i
s
automatically
s
tarted by the
s
y
s
tem.
An operation
error occur
s
.
S
EE
H01
S
EE
H02
END
END
END
END
END
END
S
EE
H01.H01
FUNC
01
