ABB REX 521, Техническое справочное руководство, общее

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1MRS 751108-MUM Protection Relay
Technical Reference Manual, General
REX 521
The incoming optical fibre is connected to the receiver, input Rx, and the outgoing
optical fibre to the transmitter, output Tx. Special attention should be paid when
handling, mounting and connecting fibre-optic cables. For additional information,
see the document 34 SPA 13 EN1 “Plastic-core fibre-optic cables. Features and
instructions for mounting”.
The communication port supports three different protocols, SPA, LON and IEC
60870-5-103. The SPA and IEC_103 protocols are always supported while LON is
not available in all relay variants. The relay does not automatically recognize which
bus it is connected to; hence the user must set the desired protocol manually through
the HMI or the Relay Setting Tool (
Main menu\Configuration\
Communication\Rear port
).
4.1.12.2. Front panel optical connection for a PC
The front connector is standardized for ABB relay products and requires an opto-
cable (ABB art. No 1MKC950001-1).
The connector supports only the SPA bus protocol, and is connected to the RS-232
port of a standard PC. By using an optical connector, the PC is isolated galvanically
from the protection relay and disturbances are minimized.
Parameters for the serial communication, “SPA address”, “Baud rate” and “Slave
status”, can be changed manually in the HMI.
To ensure fluent communication flow, it is recommended to use 9.6 kbps baud rate.
4.1.12.3. The service pin located on the rear panel
The service pin located above the connector X3.2 is used only in systems
communicating over the LON bus. The service pin is used during the installation
process or in fault detection. When the service pin is pressed, the neuron_id is sent
to the LON bus.