Setting Guidelines - ABB RET670 Applications Manual

1MRK504116-UUS C
4.5.2
Application manual
The SPA communication is mainly used for the Station Monitoring System. It can
include different IEDs with remote communication possibilities. Connection to a
computer (PC) can be made directly (if the PC is located in the substation) or by
telephone modem through a telephone network with ITU (former CCITT)
characteristics or via a LAN/WAN connection.
glass <1000 m according to optical budget
plastic <20 m (inside cubicle) according to optical budget
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 fibre 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.

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 /Settings /General settings /
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
Section 4
Station communication
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