ABB Relion 670 Series Applications Manual page 474

Section 18
Station communication
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Functionality
The SPA protocol V2.5 is an ASCII-based protocol for serial communication. The communication is
based on a master-slave principle, where the IED is a slave and the PC is the master. Only one
master can be applied on each fiber optic loop. A program is required in the master computer for
interpretation of the SPA-bus codes and for translation of the data that should be sent to the IED.
For the specification of the SPA protocol V2.5, refer to SPA-bus Communication Protocol V2.5.
18.5.2 Setting guidelines
The setting parameters for the SPA communication are set via the local HMI.
SPA, IEC 60870-5-103 and DNP3 uses the same rear communication port. Set the parameter
Operation , under Main menu /Configuration /Communication /SLM configuration /Rear optical
SPA-IEC-DNP port /Protocol selection to the selected protocol.
When the communication protocols have been selected, the IED is automatically restarted.
The most important settings in the IED for SPA communication are the slave number and baud
rate (communication speed). These settings are absolutely essential for all communication
contact to the IED.
These settings can only be done on the local HMI for rear channel communication and for front
channel communication.
The slave number can be set to any value from 1 to 899, as long as the slave number is unique
within the used SPA loop.
The baud rate, which is the communication speed, can be set to between 300 and 38400 baud.
Refer to technical data to determine the rated communication speed for the selected
communication interfaces. The baud rate should be the same for the whole station, although
different baud rates in a loop are possible. If different baud rates in the same fiber optical loop or
RS485 network are used, consider this when making the communication setup in the
communication master, the PC.
For local fiber optic communication, 19200 or 38400 baud is the normal setting. If telephone
communication is used, the communication speed depends on the quality of the connection and
on the type of modem used. But remember that the IED does not adapt its speed to the actual
communication conditions, because the speed is set on the local HMI.
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<1000 m according to optical budget
<20 m (inside cubicle) according to optical budget
1MRK 511 358-UUS A
SEMOD115767-25 v2
M11876-3 v4.1.1
Application manual