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Annex B. DNP 3.0 Communications Protocol
B-7
M7IRDA2003I
7IRD-A/J/M: Distribution Protection & Control Terminal
© ZIV APLICACIONES Y TECNOLOGÍA, S.L.U. 2020
Specific Characteristics of the Unit
There is a "Time window" (
Delay of Unsolicited Request
setting) between the generation of an
event and the subsequent transmission of the unsolicited message. This is done to group
various events in a message and save bandwidth.
Internal Indication IIN1-6 (Device Trouble)
: It activates to indicate a change in the current
DNP configuration of the remote station. It deactivates in the next response. It is used to let the
master station know that the DNP settings have changed in the remote station. Note that some
erroneous configurations could render it impossible to communicate this condition to a master
station.
This "Device Profile Document" also declares the DNP 3.0 settings available in the unit. If the
user changes any of these settings, the “
Device Trouble Internal Indication
” bit will activate in
the next response sent.
Event Files
: the unit can store up to 50 “Binary Input Changes” and 50 “Analog Input Changes.”
If the unit's limits are reached, the “Event Buffers Overflow Internal Indication” bit will be enabled
in the next response sent. It will be disabled when the master reads the changes, making room
for new ones.
The measurements (
16-Bit Analog Input
) sent by communications depend on each control
model, and their scale readings are:
Type Of Measure
Scale Reading
Value Sent
Currents
6 AAC
32767 counts
Voltages
132 (50Hz) or 144 (60HZ) V
AC
32767 counts
Powers
2376 (50Hz) or 2592 (60HZ W / Var / Va
32767 counts
Power factor
1
32767 counts
Frequency
40 – 70 Hz (With metering card: 0 – 72 Hz)
0 - 32767 counts
The scaling of the magnitude distance is:
- 20 % --- 100 %
scaling to
0 --- 32767 (16 bits)
So that:
Measurement
Value Sent
Meaning
<-20 %
0
Invalid value (quiescent)
- 20 %
0
Invalid value (quiescent)
-20
0 %
0
Invalid value (quiescent)
0 %
6553
Distance from 0 %
100 %
32767
Distance from 100 %
>100 %
0
Invalid value (quiescent)
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Страница 175: ...D List of Illustrations and Tables...