TECHNICAL NOTE
MOTION APPLICATION ENGINEERING GROUP
Yaskawa Electric America - 2121 Norman Drive South – Waukegan IL 60085
(800) YASKAWA - Fax (847) 887-7280
11/23/2005 17 of 17 eng/05.055/MCD
Drawing family hierarchy and program flow
The parent drawings begin execution automatically upon their appropriate internally
generated timing signal. Child and Grandchild drawings are programmatically called
using the SEE instruction. Calls to a descendent drawing must be contained with the
generational hierarchy, so only a linear descendent can be called. The figure below
shows the execution flow of a drawing family. “X” represents a drawing family, which can
be replaced with A, I, H or L.
Using a conditional “SEE” instruction is not recommended. This could result in problems such as
leaving an output in an undesirable state or interfere with one-shot actions.
After reviewing the drawing types, execution and hierarchy, the user is now ready to examine the
use of drawings for the machine control application.
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