154 D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
DIRECT INPUTS AND OUTPUTS CHAPTER 6: COMMUNICATIONS
configured to drive an output contact, annunciator alarm, or selected communication-
based output. Latching and acknowledging conditions, if required, need to be
programmed accordingly in the annunciator settings.
Message Alarm Events
Range: Enabled, Disabled
Default: Disabled
This setting enables and disables the logging of unreturned message alarm events in the
sequence of events recorder.
Direct input and output examples
The following application examples illustrate direct input and output configuration.
Direct inputs and outputs to extend input/output capabilities
Consider an application that requires additional contact inputs or outputs or lines of
programmable logic that exceed the capabilities of a single UR
Plus
-series device. The
problem is solved by adding an extra UR
Plus
-series IED to satisfy the additional input and
output and programmable logic requirements. The two IEDs are connected via single-
channel digital communication cards as shown.
Figure 124: Input and output extension via direct inputs and outputs
The following settings are applied to implement this application. For both IEDs, set the
inter-relay baud rate for channel 1 to 128 kbps in the Settings > Communications > Inter-
Relay menu.
For UR
Plus
-series IED 1:
Figure 125: Inter-relay communications settings for IED 1
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