DNF Controls GTP-32 - Manual (Page 11)

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GPI
The GPI Section is responsible for providing isolation between the various GPI
sources and the GPO devices, as well as detecting active GPIs. Each GPI
input is isolated using an opto-isolator that requires a differential voltage
across it to turn it on. This input supports positive and negative voltages,
active high GPI sources, and active low GPI sources. GPIs may be used as
Source Events in Combinatorial Event Definitions and in the Event Monitoring
Table.
GPI SETUP
1) From the GTP-32 Home Page, click on the “GPI” link. The GPI
Configuration Table page will be displayed.
2) At the top or bottom of the page, click on the “Edit GPI
Configuration Table” link.