Network Graphic Annunciator (NGA) Operations Guide P/N 9020-0675:B1 03/21/13 31
I/O Screen (Device Tab) I/O Screen
8.5 I/O Screen (Device Tab)
The Device tab of the I/O screen allows the user to manually enable or disable SLC devices.
After you activate the Device tab, an SLC device address or a discrete device (NAC circuit) must
be selected.
There are two methods to select the device address:
• One method is to use the Up/Down arrows
• The other method is direct entry
After selecting the device, the NGA will indicate that the status of the device is unknown. To obtain
the status information, press the "SHIFT" button twice. Once the status has been updated, it will
either read "ENABLED" or "DISABLE". The button to the right of the "SHIFT" button will toggle
the state of this device.
Disabling devices will result in a Disconnect Trouble at the selected address. This trouble condition
will automatically override the NGA's display. Enabling a device that has been previously disabled
will clear the Disconnect Trouble.
Figure 8.5.1 illustrates the screen that appears when the user
selects the Device tab from the I/O screen.
Figure 8.5.1 - I/O Screen (Device Tab)
NOTE: To disable the Municipal Circuit, you must configure the target node to explicitly
allow the Municipal Circuit to be disabled.
NOTE: To close this screen, press the "X" button in the upper right corner.
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