YASKAWA MP3000 Series, Руководство по установке, Страница: 137 / 326

4.1 User Program Types and Execution Timing
4.1.1 Ladder Programs
4-4

Hierarchical Configuration
There are four types of ladder drawings: parent drawings, child drawings, grandchild drawings,
and operation error drawings.
•
Parent Drawings
These drawings are automatically executed by the system program when the execution con-
ditions are met.
•
Child Drawings
These drawings are executed when they are called from a parent drawing with a SEE instruc-
tion.
•
Grandchild Drawings
These drawings are executed when they are called from a child drawing with a SEE instruc-
tion.
•
Operation Error Drawings
These drawings are automatically executed by the system program when an operation error
occurs.
A parent drawing cannot call a child drawing from a different type of drawing. Similarly, a child
drawing cannot call a grandchild drawing from a different type of drawing. A parent drawing
cannot call a grandchild drawing directly. The parent drawing first must call the child drawing,
and then the child drawing must call the grandchild drawing. This is called the hierarchical con-
figuration of drawings.
The following figure shows the parent-child-grandchild structure in which a program is created.
User Functions Grandchild
Drawings
Child
Drawings
Parent
Drawing
Note 1: = A, I, H, or L
DWG. DWG. 01
DWG. nn
DWG. 01.01
DWG. 01.02 FUNC-001
FUNC-006
FUNC-032
FUNC-064
DWG. 01.03
DWG notation:
Grandchild drawing number
Parent drawing type (A, I, H, or L)
Child drawing number
Note 2: The following notation is used for operation error drawings.
Parent drawing type (A, I, H, or L) of the
drawing where the error occurs
Fixed value (00)
DWG. .
DWG. 00