Alstom MiCOM P846, Technical Manual

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SCADA Communications P846/EN SC/D
MiCOM P846 (SC) 13-5
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Ensure that the field voltage is not being used for other purposes (i.e. powering logic
inputs) as this may cause noise to be passed to the communication network.
1.2.2 Courier communication
Courier works on a master/slave basis where the slave units contain information in the form
of a database, and respond with information from the database when it is requested by a
master unit.
The relay is a slave unit that is designed to be used with a Courier master unit such as
MiCOM S1, MiCOM S10, PAS&T or a SCADA system.
To use the rear port to communicate with a PC-based master station using Courier, a KITZ
K-Bus to EIA(RS)232 protocol converter is required. This unit is available from Alstom Grid.
A typical connection arrangement is shown in Figure 2. For more detailed information on
other possible connection arrangements refer to the manual for the Courier master station
software and the manual for the KITZ protocol converter. Each spur of the K-Bus twisted
pair wiring can be up to 1000m in length and have up to 32 relays connected to it.
P0109ENe
SC
Figure 2:
Courier, the relay’s address and the inactivity timer. Synchronous communication is used at
a fixed baud rate of 64kbits/s.
Remote communication connection arrangements
Having made the physical connection to the relay, the relay’s communication settings must
be configured. To do this use the keypad and LCD user interface. In the relay menu firstly
check that the ‘Comms. settings’ cell in the ‘Configuration’ column is set to ‘Visible’, then
move to the ‘Communications’ column. Only two settings apply to the rear port using