Update Documentation P44x/EN AD/E44
MiCOM P441, P442 & P444
Page 17/82
1. RELAY SYSTEM OVERVIEW
1.1.5 Input and output boards
P441 P442 P444
Opto-inputs 8 x UNI
(1)
16 x UNI
(1)
24 x UNI
(1)
Relay outputs 6 N/O
8 C/O
9 N/O
12 C/O
24 N/O
8 C/O
Universal voltage range opto inputs N/O – normally open
C/O – change over
• P444 could manage in option : 46 outputs
• Fast outputs can be ordered following the cortec reference (available in the Technical
Data Sheet document)
• See also the hysteresis values of the optos in the §6.2 from chapter AP
1.1.7 Second rear comms and InterMiCOM board (optional)
The optional second rear port is designed typically for dial-up modem access by protection
engineers/operators, when the main port is reserved for SCADA traffic. It is denoted “SK4”.
Communication is via one of three physical links: K-Bus, EIA(RS)485 or EIA(RS)232. The
port supports full local or remote protection and control access by MiCOM S1 software. The
second rear port is also available with an on board IRIG-B input.
The optional board also houses port “SK5”, the InterMiCOM teleprotection port. InterMiCOM
permits end-to-end signalling with a remote P440 relay, for example in a distance protection
channel aided scheme. Port SK5 has an EIA(RS)232 connection, allowing connection to a
MODEM, or compatible multiplexers.
1.1.8 Ethernet board
This is a mandatory board for UCA2.0 enabled relays. It provides network connectivity
through either copper or fibre media at rates of 10Mb/s or 100Mb/s. This board, the IRIG-B
board and second rear comms board are mutually exclusive as they both utilise slot A within
the relay case.
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