Alstom MiCOM P54 Series, Technical Manual, Page: 757 / 1024

Commissioning P54x/EN CM/La4
MiCOM P543, P544, P545 & P546
CM) 10-9
CM
2.1 Opto I/P status
This menu cell displays the status of the relay’s opto-isolated inputs as a binary string, a ‘1’
indicating an energized opto-isolated input and a ‘0’ a de-energized one. If the cursor is
moved along the binary numbers the corresponding label text will be displayed for each logic
input.
It can be used during commissioning or routine testing to monitor the status of the opto-
isolated inputs whilst they are sequentially energized with a suitable dc voltage.
2.2 Relay O/P status
This menu cell displays the status of the digital data bus (DDB) signals that result in
energization of the output relays as a binary string, a ‘1’ indicating an operated state and ‘0’
a non-operated state. If the cursor is moved along the binary numbers the corresponding
label text will be displayed for each relay output.
The information displayed can be used during commissioning or routine testing to indicate
the status of the output relays when the relay is ‘in service’. Additionally fault finding for
output relay damage can be performed by comparing the status of the output contact under
investigation with its associated bit.
Note: When the ‘Test Mode’ cell is set to ‘Contacts Blocked’ this cell will
continue to indicate which contacts would operate if the relay was in-
service, it does not show the actual status of the output relays.
2.3 Test port status
This menu cell displays the status of the eight digital data bus (DDB) signals that have been
allocated in the ‘Monitor Bit’ cells. If the cursor is moved along the binary numbers the
corresponding DDB signal text string will be displayed for each monitor bit.
By using this cell with suitable monitor bit settings, the state of the DDB signals can be
displayed as various operating conditions or sequences are applied to the relay. Thus the
programmable scheme logic can be tested.
2.4 Red LED status and green LED status
The ‘Red LED Status’ and ‘Green LED Status’ cells are eighteen bit binary strings that
indicate which of the user-programmable LEDs on the relay are illuminated when accessing
the relay from a remote location, a ‘1’ indicating a particular LED is lit and a ‘0’ not lit. When
the status of a particular LED in both cells is ‘1’, this indicates the LEDs illumination is yellow.
2.5 Monitor bits 1 to 8
The eight ‘Monitor Bit’ cells allow the user to select the status of which digital data bus
signals can be observed in the ‘Test Port Status’ cell or via the monitor/download port. Each
‘Monitor Bit’ is set by entering the required digital data bus (DDB) signal number (0 – 1791)
from the list of available DDB signals in the Relay Menu Database (
P54x/EN MD ). The pins
of the monitor/download port used for monitor bits are given in the table overleaf. The signal
ground is available on pins 18, 19, 22 and 25.
Monitor Bit 1 2 3 4 5 6 7 8
Monitor/Download Port Pin 11 12 15 13 20 21 23 24
THE MONITOR/DOWNLOAD PORT DOES NOT HAVE ELECTRICAL ISOLATED
AGAINST INDUCED VOLTAGES ON THE COMMUNICATIONS CHANNEL. IT SHOULD
THEREFORE ONLY BE USED FOR LOCAL COMMUNICATIONS.