P54x/EN PL/La4 Programmable Logic
(PL) 7-22
MiCOM P543, P544, P545 & P546
PL
DDB no. English text Source Description
442 Init Close CB2 PSL
Initiate closing of circuit breaker 2 from a
manual command
P544 and P546 only
443 Reset Close Dly PSL Reset manual circuit breaker close time delay
444 Reset Relays/LED PSL
Reset latched relays & LEDs (manual reset of
any lockout trip contacts, auto-reclose lockout,
and LEDs)
445 Reset Thermal PSL Reset thermal state to 0%
446 Reset (CB1) Lockout PSL
Manual control to reset auto-recloser from
lockout
447 Reset CB (1) Data PSL Reset circuit breaker maintenance values
448
BAR (P543 and P545)
Block CB1 AR (P544 and
P546)
PSL
Block the Auto-reclose function (CB1 only in
P544 and P546) from an external input
449 En 1pole reclose PSL
Enable 1 pole reclose from an external input
P543/P545 only
450 En 3pole reclose PSL
Enable 3 pole reclose from an external input
P543/P545 only
451 Pole Discrepancy (CB1) PSL
Pole discrepancy (from external detector) -
input used to force a 2nd single pole trip to
move to a 3 pole auto-reclose cycle
452 Loopback Mode PSL To enable loopback mode via opto input
453 Perm Intertrip
Permissive intertrip mapping what will be sent
to the remote line end
454 Stub Bus Enabled
To enable stub bus protection in relays with
two CT inputs. When enabled, all current
values transmitted to the remote relays, and all
those received from remote relays, are set to
zero. Differential intertrip signals are not sent
The protection provides differential protection
for the stub zone
455 Inhibit C Diff
When linked to an opto input, inhibits
differential relay at the local end and send an
inhibit command to the remote end
456 Recon Interlock
This must be energized (along with DDB 455 -
inhibit C Diff) at the time that a relay
configuration is changed from 3 ended to 2
ended scheme. This usually should be driven
from a 52-B contact of the CB connected to
the line end that is taken out of service
457 Prop Delay Equal PSL
If a P54x relay working with GPS sample
synchronization loses GPS and there is a
further switch in the protection
communications network, the relay becomes
Inhibit. If GPS become active again, the relay
will automatically reset. But if not, the user can
remove the inhibited condition by energizing
this DDB signal as long as it is ensured that
propagation delay times are equal
458 Inhibit WI PSL Inhibit weak infeed aided scheme logic
459 Test Mode PSL
Commissioning tests - automatically places
relay in test mode
460 Command Blocking PSL
For IEC-870-5-103 protocol only, used for
"Command Blocking" (relay ignores SCADA
commands)
461 Monitor Blocking PSL
For IEC-870-5-103 protocol only, used for
"Monitor Blocking" (relay is quiet - issues no
messages via SCADA port)
462 Not used
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