ABB REB500 Operation Manual page 72

Section 3
HMI500
64
Figure 50 Test mode
Table 15 Buttons in Test mode dialog
Button Description
Unblock all relays Restores the relays to normal operation and their statuses can change again.
Block all relays Prevents the statuses of all relays for which outputs have been configured
from being changed.
Force security See Cyber security guideline
events
Block all tripping Prevents the statuses of all relays from being changed with the exception of
relays 41810_In service, 41835_Test generator active and 41410_Output relays
blocked.
Reset all Returns all inputs and outputs which had statuses impressed on them for test
overridden relays purposes to their original states.
An output relay can be set or reset either directly (e.g. by setting
an output relay) or indirectly (e.g. via an input or by a protection
function).
The greatest care must be taken when using the test mode,
especially when the protection system is in operation.
Blocking by the test generator takes precedence over all other
functions, i.e. neither a protection function nor an External TRIP
signal can initiate a trip.
1MRK 500 124-UEN
Operation Manual
Distributed busbar protection REB500