Nematron Pointe Controller - Manual (Page 263)

Pointe Controller User Guide Appendix A: OptiLogic Technical Specifications
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A.9.1 OL2252 Configuration Options
The OL2252 module is configured through the Configure I/O menu command in
the PointeControl development framework. (For more information on Configure
I/O, see page 118.) Selecting an OL2252 module and clicking the I/O button opens
the OL2252 I/O Map dialog window…
Inputs tab
Each Input point, from 0 through 7, is associated with a single Input Bit tag
(%IX).
To configure an Input, click the to the right and select an Input Bit tag from
the pop-up menu. Each tag can be used only once.
NOTE: You can leave any or all Inputs unconfigured, but if you do, the pulse
counters may not work as intended.