Station Communication; Modification Sales - ABB RELION REX640 Technical Manual

Section 2
REX640 overview
2.6
2.7
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configured which can act as a backup CAM server if the primary CAM server is not
accessible.
The protection relay is the CAM client and can maintain its own replica database of
the user accounts and roles configured in the CAM server. This CAM replica database
acts as a backup authentication mechanism if primary and secondary CAM servers are
not accessible from the protection relay.
Each protection relay supports eight roles and 50 user accounts in the CAM replica
database. Each user account can be mapped to a maximum of eight roles.
For more information on user management and security logging, see
the cyber security deployment guideline.
For user authorization for PCM600, see the PCM600 documentation.

Station communication

Operational information and controls are available through a wide range of
communication protocols including IEC 61850 Edition 2, IEC 61850-9-2 LE, IEC
60870-5-103, Modbus® and DNP3. Full communication capabilities, for example,
horizontal communication between the relays, are only enabled by IEC 61850.
The IEC 61850 protocol is a core part of the relay as the protection and control
application is fully based on standard modelling. The relay supports Edition 2 and
Edition 1 versions of the standard. With Edition 2 support, the relay has the latest
functionality modelling for substation applications and the best interoperability for
modern substations.

Modification Sales

Modification Sales is a concept that provides modification support for already
delivered relays. Under Modification Sales it is possible to modify both the hardware
and software capabilities of the existing relay. The same options are available as when
a new relay variant is configured and ordered from the factory: it is possible to add new
hardware modules into empty slots, change the type of the existing modules within the
slots or add software functions by adding application and, if necessary, add-on
packages. If it is needed to use the possibilities provided by the Modification Sales
concept, please contact your local ABB unit.
1MRS759142 C
REX640
Technical Manual