SCADA Communications P54x/EN SC/La4
MiCOM P543, P544, P545 & P546
(SC) 13-25
The diagram below illustrates the behavior when t
he Control Input is set to Pulsed or
Latched.
P4218ENf
DNP Latch
ON
DNP Latch
ON
DNP Latch
OFF
DNP Latch
OFF
'Behaviour of Control Inputs
Existing with Pulsed/Latched Setting
Aliased Control Inputs with Pulsed/Latched Setting
Note: The pulse width is equal to the duration of one protection
iteration (
1
/
12
cycle for P54x)
Control Input
(Latched)
Aliased Control
Input
(Latched
)
Control Input
(Pulsed)
Aliased Control
Input
(
Pulsed
)
Figure 6 Behavior of DNP3.0 control inputs
Note: In the P54x, if the differential protection and distance protection are
both enabled, the protection iteration runs at 12 times per power
system cycle. If either the differential protection or the distance
protection is disabled, the protection iteration runs at 16 times per
power system cycle.
4.4 Object 20 binary counters
Obje
ct 20, binary counters, contains cumulative counters and measurements. The binary
counters can be read as their present ‘running’ value from object 20, or as a ‘frozen’ value
from object 21. The running counters of object 20 accept the read, freeze and clear
functions. The freeze function takes the current value of the object 20 running counter and
stores it in the corresponding object 21 frozen counter. The freeze and clear function resets
the object 20 running counter to zero after freezing its value. Binary counter and frozen
counter change event values are available for reporting from object 22 and object 23
respectively. Counter change events (object 22) only report the most recent change, so the
maximum number of events supported is the same as the total number of counters. Frozen
counter change events (object 23) are generated when ever a freeze operation is performed
and a change has occurred since the previous freeze command. The frozen counter event
queues will store the points for up to two freeze operations.
SC
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