Yaskawa MP940 - Manual (Page 66)

3.4 User Programs
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• A parent drawing cannot call a child drawing of a different type, and a child drawing cannot call a
grandchild drawing of a different type.
• A parent drawing cannot directly call a grandchild drawing. A child drawing must be referenced
from a parent drawing, and a grandchild drawing must be called from that child drawing.
• A parent drawing is automatically called (and executed) by the system. A child drawing is called
from a parent drawing using the SEE instruction. Therefore, user programs containing only child
and grandchild drawings cannot be executed.
„ Execution Processing Method of Drawings
Drawings in the hierarchy are executed by the lower-level drawings being called from
upper-level drawings. The following figure shows the hierarchical arrangement of drawings,
using the example of DWG.A.
INFO
DWG.X YY . ZZ
FUNC-001
DWG.A
SEE A02
DEND
DWG.A01
SEE A01.01
SEE A01.02
DEND
DEND
DEND
DEND DEND
DEND
DWG.A02
DWG.A00
DWG.A01.01
SEE A01
FUNC-001
DWG.A01.02
FUNC-001
:DWG. X 00
Starts according to
the system program
execution condition
Parent Drawing Child Drawings Grandchild Drawings
Functions
Operation
error
Started auto-
matically by
the system.
Drawing notation:
Grandchild drawing No. (01 to 99)
Child drawing No. (01 to 99)
Type of parent drawing (A, I, S, H, L)
Operation error drawing (A, I, S, H, L)