ABB RELION REX640 Operation Manual page 152

Commissioning
The number of composition and setting changes can be seen from the
changes parameter in Monitoring > IED status.
LCT-generated events are reported as a bit-masked value (change flags); for
example, value 9 means that hardware and site identifier changes have been done to
the relay.
Table 29: LCT-generated events
Bit
0
1
2
3
4
Other
152
Description
Hardware change
Software change
Configuration change
Site identifier change
Retrofit change
Not in used
1MRS759118 D
Composition
REX640
Operation Manual