1MDU07205-YN rev. F
REF601 CEI
User’s manual
29
Protection Functions
Remote -Local Mode
4.5.3
In relay, there are two modes of operation termed as
• Remote mode
• Local mode
These modes changeover happens automatically based on the state of relay. If the
relay is in default screen, the relay mode will be automatically set to remote mode.
And if the menu navigation access is initiated the mode will get change automatically
to local mode.
According to the mode selected, relay operations were either inhibited or allowed
to perform. Below mentioned are the relay operations categorized based on type of
mode:
Relay operations Local emote
Breaker Open X
Breaker Close X
Reset
Binary inputs
Remote Trip
Read * X MODBUS related
operations
Write X
R
* A case when relay is in local mode & its parameter got changed, then those latest
updated parameter will be refl ected on MODBUS side only when relay changeover
to remote mode else older data will be read.
As an illustration, if user is performing menu navigation operation, then relay will be
automatically confi gured to local mode. In such a situation any MODBUS related ac-
tions & either breaker open or close will be inhibited or will not function. While rest all
actions can be performed.
Otherwise, in case relay is in default screen mode then all above mentioned
action in table can be performed.
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