The SPA communication setting parameters are set on the local HMI under Main menu/
Configuration/Communication/Station communication/SPA/SPA:1.
The most important SPA communication setting parameters are SlaveAddress and
BaudRate. They are essential for all communication contact to the IED. SlaveAddress and
BaudRate can be set only on the local HMI for rear and front channel communication.
SlaveAddress can be set to any value between 1–899 as long as the slave number is unique
within the used SPA loop. BaudRate (communication speed) can be set between 300–
38400 baud. BaudRate should be the same for the whole station although different
communication speeds in a loop are possible. If different communication speeds are used
in the same fibre optical loop or RS485 network, take this into account when making the
communication setup in the communication master (the PC).
With local fibre optic communication, communication speed is usually set to 19200 or
38400 baud. With telephone communication, the speed setting depends on the quality of
the connection and the type of modem used. Refer to technical data to determine the rated
communication speed for the selected communication interfaces.
The IED does not adapt its speed to the actual communication conditions
because the communication speed is set on the local HMI.
Section 21 1MRK 506 369-UUS -
Station communication
872 Line distance protection REL670 2.2 ANSI
Application manual
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