P44x/EN AD/E44 Update Documentation
Page 76/82
MiCOM P441, P442 & P444
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 – see section 10.2. 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.
Another indication of the amount of noise on the channel is provided by the communications
failure alarm. Within a fixed 1.6 second time period the relay calculates the percentage of
invalid messages received compared to the total number of messages that should have
been received based upon the “Baud Rate” setting. If this percentage falls below the
threshold set in the “IM Msg Alarm Lvl” cell, a “Message Fail” alarm will be raised.
Settings
The settings available in the INTERMiCOM COMMS menu column are as follows:
Setting Range
Menu Text Default Setting
Min Max
Step Size
INTERMICOM COMMS
IM Output Status 00000000
IM Input Status 00000000
Source Address 1 1 10 1
Receive Address 2 1 10 1
Baud Rate 9600 600 / 1200 / 2400 / 4800 / 9600 / 19200
Ch Statistics Invisible Invisible / Visible
Reset Statistics No No / Yes
Ch Diagnostics Invisible Invisible / Visible
Loopback Mode Disabled Disabled / Internal / External
Test pattern 11111111 00000000 11111111 -
TABLE 6
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