*
IEC 60870-5-103 with the extensions for control functions according to VDEW
(Vereinigung Deutscher Elektrizitätswerke = Association of German Utilities)
*
IEC 61850 (only vertical communication, no GOOSE messages provided)
The first two protocols, SPA and LON according to LAG 1.4, are ABB specific. The
LON LAG 1.4 protocol has specific features for high accuracy time
synchronization. In this case, the REF 542plus units are synchronized from the
interbay bus. The other protocols, MODBUS RTU, MODBUS TCP, IEC 60870-5-
103 and IEC 61850 guarantee an open connectivity to any third party system.
MODBUS RTU and SPA protocols can run on a module equipped with two serial
channels.Simultaneous use of the two serial channels as physical redundancy is not
possible. The connection to two different SCADA systems is possible (for the SPA
protocol, provided that one of the two SCADA systems is for monitoring purposes
only).
Moreover, the presence of the Ethernet port located on the mainboard of the
REF 542plus extends the potential future connectivity of the REF 542plus unit.
Multiport communication can now be operated, for example, ABB LON protocol on
the optional communication module and simultaneously MODBUS TCP and the
embedded Web server.
4.10.
Embedded Web Server
REF 542plus can be equipped with an embedded Web server for monitoring
purposes (WEB REF). The Ethernet port on the main module provides connectivity
to the Web. By using a standard PC with a commercial Web browser, the user can
gain access to the substation units using the Web facilities. Monitoring the
substation units is then possible from everywhere; the implemented security
mechanism prevents unwanted accesses and guarantees the required safety.
As soon as the browser is connected to the REF 542plus unit, the switchgear
overview is displayed. From here, the user can scroll through the single line
diagram. Clicking on the address button, the specific REF 542plus unit single line
diagram is loaded, with also all the information that would be normally available
standing in front of the HMI. REF 542plus data are available in read mode only
(monitoring access).
WEB REF makes also available the possibility to send SMS messages or e-mail via
the GSM network upon specific, user-defined condition (trips, alarms, etc.). A
suitable GSM modem must be connected to the mainboard module.
28
REF 542plus
REF 542plus
Multifunction Protection and Switchbay Control
Unit
Technical Reference Manual
1MRS755859
