5.Lon Bus - ABB REX 521 Technical Reference Manual, General

REX 521
4.1.12.5.
26
Protection Relay
Technical Reference Manual, General
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LON bus
The protection relay is able to interface to the substation automation system with the
LON communication protocol. The LON communication between the REX 521 and
the host device, e.g. MicroSCADA, is based on LAG (Lon Application Guideline)
version 1.4. The REX 521 LON communication includes vertical communication of
process data and parameter data between the protection relay and the host device.
The system very often resembles the system in the figure below. The protection,
control or alarm functions are implemented by using the REX 521 protection relays
and other RED 500 series protection relays, SPACOM units or other SPA bus
devices (devices connected to the system via the SPA bus). LON devices made by
other manufacturers or other ABB companies may be used for various DI, AI and
DO functions. MicroSCADA is used for remote control.
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