PSC PT Program Generator Node Types and the Parent-ChildRelationship

Operation Nodes

Node Types and the Parent-Child Relationship

•For example, an application with collect and store functions would be broken up into a collection function and a storage function.

•For example, a storage function may contain steps to verify the data meets certain criteria, store the data in a file and track the amount of data stored. This may, depending on the complexity of each step, be broken up into functions which perform each step.

Node Types and the Parent-Child Relationship

Build your application in a modular fashion, taking advantage of the Parent- Child relationship. There can be multiple levels in each program flow chart. Any type of Operation node can exist at any level. The top level is the parent and lower levels are children.

Table 1. Function and Operation Nodes

Function Nodes	Operation Nodes
	Menu Nodes starting on page 5-55
	Display Nodes starting on page 5-56
	Input Nodes starting on page 5-57
Frames starting on page 5-50	Output Nodes starting on page 5-60
	Verify Nodes starting on page 5-63
Subroutines starting on page 5-51
	Copy Nodes starting on page 5-66
	Modify Nodes starting on page 5-67
	Math Nodes starting on page 5-69
	Call Nodes starting on page 5-72

Applications constructed with PPG contain two general types of nodes, Function Nodes, which include Frames and Subroutines, and Operation Nodes. Each Frame in a program flow chart represents a major function or option. Connect Frames together in a logical way that indicates program flow.

While it is possible to create an entire application at the main frame level, this is not the best approach for any but the smallest applications.

are described briefly in Creating Operation Nodes on page 18, and more completely in Creating & Using Nodes on page 49.

User’s Guide 17