Commissioning P54x/EN CM/La4
MiCOM P543, P544, P545 & P546
CM) 10-35
CM
6.1.7 Loopback test
Set cell [0F14 IM64 Test Mode] to ‘Enabled’, and use cell [0F15 IM64 Test Pattern] to set a
bit pattern to be sent via the InterMiCOM
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loopback. To verify the correct operation of
loopback test, check in the [MEASUREMENTS 4] column that the contents of cell ‘IM64 Rx
Status’ matches with the test pattern set. The communication statistics will indicate the
number of valid and any errored messages received, note that the propagation delay
measurement will not be valid in this mode of operation. The relay will now respond as if it is
connected to a remote relay. The relay will indicate a loopback alarm which can only be
cleared by setting the ‘Test Loopback’ to disabled.
Note: In loopback mode the signals sent and received via the protection
communications / InterMiCOM
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interface continue to be routed to and
from the signals defined in the programmable logic.
Note: A test pattern can be also sent to the remote end in order to test the
whole InterMiCOM communication path by enabling (OF14 IM64 Test
Mode) and connecting two ends. If such a test is performed, special
care has to be taken as the test pattern will be executed via PSL at
the remote end.
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