Yaskawa MP900 Series Ladder Programming Manual - Manual (Page 45)

4.2 Ladder Drawings
4.2.1 Types of Ladder Drawings
4-4
( 2 ) Hierarchical Configuration of Drawings
Each process program is organized in a parent-child-grandchild hierarchy.
The parent drawing first must call a child drawing, and then the child drawing must call a grandchild drawing. This is
called the hierarchical configuration of drawings.
A parent drawing cannot call a child drawing with a different drawing type. Similarly, a child drawing cannot call a
grandchild drawing from a different drawing type. A parent drawing cannot call a grandchild drawing directly.
You can call functions from any drawing regardless of the drawing type or hierarchy.
The hierarchy of drawings is shown below using DWG.A drawings as an example.
DWG.X YY .ZZ
Parent drawing type (A, I, H, or L)
Child drawing number (01 to 99)
Grandchild drawing number (01 to 99)
DWG.X 00
Parent drawing type (A, I, H, or L)
of the drawing where the error occurs
Drawing name:
The following notation is used for operation error drawings.
A
Parent
drawing
A01 A01.01
A01.02
A02 A02.01
Child
drawings
Grandchild
drawings
Functions
FUNC01
FUNC02
FUNC03
Fixed value (00)