Nematron Pointe Controller - Manual (Page 163)

Pointe Controller User Guide Chapter 5: Developing Controller Programs
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5.7.6 Subchart Block
A Subchart block makes a call to a previously
defined subchart , analogous to a call to a
subroutine in a programming language. When
program flow reaches a Subchart block, the chart
transfers program flow to the Start block in the
called subchart. Program flow continues from that
point until reaching a Return block. Control then
returns to the calling (main) chart and proceeds
with the block immediately following the original
Subchart block. You can nest Subchart calls; a main chart may call a subchart,
which can in turn call another subchart, etc.
PROPERTY WHAT YOU ENTER
Caption User label for the block.
Call Chart Name of the subchart to call.
Arguments Arguments to pass.
Local Vars Variables local to the subchart.
Subchart Arguments
When calling a function chart, you must assign tag references to the called chart’s
internal tags. To assign these values, pass arguments from the calling chart’s
subchart block to the called chart (specified by CallChart):
1. Add or select a Subchart block.
2. In the Block Properties box, select a chart from the CallChart drop-down
list. After you select a chart, the properties appear in the Block Properties
box.
3. Press the logic statement button for each property to build the arguments
that are passed from the calling chart’s subchart block to the called
subchart. For internal references, you can assign a value or reference any
tag.
4. Access the local variables that are to be used within the subchart. The
local variables are not accessible from other charts.