Table of Contents
Advertisement
&KDSWHU
Requirements
*HQHUDO
6HULDO FRPPXQLFDWLRQ
63$
Both plastic fibres and glass fibres can be used for the communication in the station. For
distances up to 30 m, plastic fibres and for distances up to 500 m, glass fibres are suit-
able. Glass and plastic fibres can be mixed in the same loop. The transmitter and reciev-
er connectors at the bus connection unit has to be of corresponding types, i.e. glass or
plastic connector. See also "Hardware modules" in the Technical reference manual for
technical data on the fibres.
For communication on longer distances, telephone modems are used. The modems
must be Hayes-compatible ones using "AT" commands with automatic answering (AA)
capability. The telephone network must comply with the CCITT standards.
For connection of the optical fibre loop to a PC or a telephone modem, an opto/electrical
converter is required. The converter is supplied by ABB.
/21
The protection terminal can be used in a substation control system (SCS). For that pur-
pose, connect the LON communication link to a LON Star Coupler via optical fibres.
The optical fibres are either glass or plastic with specification according to "Hardware
modules" in the Technical reference manual.
A PC can be used as a station HMI. The PC must be equipped with a communication
card for LON (e.g. Echelon PCLTA card).
To configure the nodes in a SCS, the LON Network Tool is needed.
,(&
As an alternative to SPA communication, the terminals can use the IEC 870–5–103
standard protocol for protection functions. The terminals communicate with a primary
station level system. In IEC terminology a primary station is a master and a secondary
station is a slave. The communication is based on a point to point principle, where the
terminal is a slave. The master must have a program that can interpret the IEC 870–5–
103 communication messages. The IEC communication link is connected via optical fi-
bres. The optical fibres are either glass or plastic with specification according to "Hard-
ware modules" in the Technical reference manual.
For more detailed requirements refer to the IEC 870–5–103 standard.
18
Advertisement
Table of Contents
