Siemens SIPROTEC 5 Manual page 368

Supervision Functions
8.3 Supervision of the Secondary System
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Set the binary input used for signaling-voltage supervision within one input/output module using the setting
option (see the following figure). This binary input monitors the presence of the signaling voltage. If the
signaling voltage fails, this sets the quality attribute for all other binary inputs of the parameterized input/
output module to invalid. The signal status of each of these binary inputs is frozen with its last valid value
prior to the occurrence of the fault. The quality attribute of the binary inputs for other input/output modules
are not taken into consideration by this.
If the signaling voltage again exceeds the binary threshold, the quality attribute of the binary inputs is reset to
valid.
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NOTE
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Each status change of the monitored binary inputs is delayed by 3 ms.
You can also combine binary inputs across modules in one Supervision group function block, and define any
binary input within this group for the supervision of the signaling voltage. For this purpose, place a check
mark at the parameter (_:102) Enable variable group when configuring the supervision group. This
extends the parameter menu by the sections Start supervision group and End supervision group (see the
following figure).
368 SIPROTEC 5, Fault Recorder, Manual
C53000-G5040-C018-5, Edition 11.2017