Table 5:
CROB fields supported
Point index
Name/description
Supported CROB fields
See the point list manual.
All
1)
1) In this IED implementation the pulse-on time cannot be commanded from the DNP3 master. A value
in the variable pulse-on time field in the CROB command is ignored, but the command is accepted.
It should be noticed that control pulse lengths for CB controls in this IED are configurable via
PCM600. Pulse lengths for other types of outputs are in internally fixed.
3.2.3
Analog inputs
The following table lists analog inputs (object 30). It is important to note that 16 bit
and 32 bit variations of analog inputs are transmitted through DNP3 as signed
numbers.
The original DNP3 analog value is the same value as the IEC 61850
value generated for the same point. Measurands in IEC 61850 are
expressed as floating point values while DNP3 analog values are
integers. Therefore, it may be necessary to scale the original DNP3
values in order to include possible decimals in the DNP3 integer
value.
The deadband is not configured in DNP3. It is configured at the device level. The
analog change events are therefore generated by the device functions, not DNP3.
The analog change event time stamp will inherently be accurate and consistent with
the reporting of events though other channels, for example, LHMI, WHMI and
other communication protocols.
There are four scaling options associated with analog input reporting.
•
None: the reported value is the process value.
•
Multiplication: the process value is multiplied by a constant. An offset is
added producing the reported value.
•
Division: the process value is divided by a constant. An offset is added
producing the reported value.
•
Ratio:
•
Configuration-time ratio scaling: Find R for new set of {in_min, in_max,
out_min, out_max}
R = (out_max - out_min)/(in_max - in_min)
•
Runtime ratio scaling: Reported value = (inval - in_min) * R + out_min
The analog input event buffer size is set to 150. Events that occur after buffer
overflow are discarded.
Section 3
1MRS757820 B
Vendor-specific implementation
14
Recloser Protection and Control RER615
Communication Protocol Manual
