Update Documentation P44x/EN AD/E44
MiCOM P441, P442 & P444
Page 77/82
9.10.5.2
InterMiCOM Statistics & Diagnostics
Once the relay operation has been confirmed using the loopback test facilities, it will be
necessary to ensure that the communications between the two relays in the scheme are
reliable. To facilitate this, a list of channel statistics and diagnostics are available in the
InterMiCOM COMMS column and are explained below:
Ch Statistics
Rx Direct Count No. of Direct Tripping messages received with the correct message
structure and valid CRC check.
Rx Perm Count No. of Permissive Tripping messages received with the correct
message structure.
Rx Block Count No. of Blocking messages received with the correct message structure.
Rx NewDataCount No. of different messages received.
Rx ErroredCount No. of incomplete or incorrectly formatted messages received.
Lost Messages No. of messages lost within the previous time period set in “Alarm
Window” cell.
Elapsed Time Time in seconds since the InterMiCOM channel statistics were reset.
Ch Diagnostics
OK = DCD is energised
FAIL = DCD is de-energised
Absent = InterMiCOM board is not fitted
Data CD Status Indicates when the DCD
line (pin 1) is energised.
Unavailable = hardware error present
OK = valid message structure and
synchronisation
FAIL = synchronisation has been lost
Absent = InterMiCOM board is not fitted
FrameSync Status Indicates when the
message structure and
synchronisation is valid.
Unavailable = hardware error present
OK = acceptable ratio of lost messages
FAIL = unacceptable ratio of lost messages
Absent = InterMiCOM board is not fitted
Message Status Indicates when the
percentage of received
valid messages has
fallen below the
“IM Msg Alarm Lvl”
setting within the alarm
time period.
Unavailable = hardware error present
OK = channel healthy
FAIL = channel failure
Absent = InterMiCOM board is not fitted
Channel Status Indicates the state of the
InterMiCOM
communication channel.
Unavailable = hardware error present
OK = InterMiCOM hardware healthy
Read Error = InterMiCOM hardware failure
Write Error = InterMiCOM hardware failure
IM H/W Status Indicates the state of the
InterMiCOM hardware.
Absent = InterMiCOM board is either not
fitted or failed to initialise
TABLE 7
It is possible to hide the channel diagnostics and statistics from view by setting the “Ch
Statistics” and/or “Ch Diagnostics” cells to “Invisible”. All channel statistics are reset when
the relay is powered up, or by user selection using the “Reset Statistics” cell.
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