Nematron Pointe Controller - Manual (Page 123)

Pointe Controller User Guide Chapter 5: Developing Controller Programs
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5.5 Associating Tags with I/O points
I/O points are the many input and output channels that are made available to
your control application when you install OptiLogic I/O modules and operator
panels in your Pointe Controller unit. Each point is associated with a tag in your
project’s
Logic Memory database. Your project controls these points by reading
from and writing to the associated tags.
To configure your project’s I/O points, you must first specify which modules and
panel are actually installed in your controller. Then you can step through each
module and manually associate Logic Memory tags to each specific input and
output channel.
NOTE: Each Logic Memory tag can be associated with only one I/O point, so make
sure that you have defined enough tags to cover every point on your installed
modules and operator panel. If necessary, you can go back and define additional
tags as you configure each module.
5.5.1 Specifying your installed hardware
Before you can associate Logic Memory variables with individual I/O points, you
must first specify which OptiLogic I/O modules and operator panel will ultimately
be installed in your Pointe Controller unit. Your PointeControl project cannot
recognize or communicate with these modules at runtime if they are not properly
configured.
NOTE: You can add and remove modules at any time so long as you properly
configure them as described here, then adjust your programming to
accommodate the changes and
recompile your project for the Pointe Controller
unit.
To specify what I/O modules and operator panels are installed in your Pointe
Controller unit:
1. Check your controller and make note of what modules you have installed.
(For more information on selecting and installing modules, see Chapter 4,
“System Design and Installation,” starting on page 70.)