P54x/EN SC/La4 SCADA Communications
(SC) 13-26
MiCOM P543, P544, P545 & P546
SC
4.5 Object 30 analog input
Object 30, analog inputs, contains information from the relay’s measurements columns in the
menu. All object 30 points can be reported as 16 or 32 bit integer values with flag, 16 or 32
bit integer without flag as well as short floating-point values. Analogue values can be
reported to the master station as primary, secondary or normalized values (which takes into
account the relay’s CT and VT ratios) and this is settable in the DNP3.0 Communications
Column on the relay. Corresponding deadband settings can be displayed in terms of a
primary, secondary or normalized value. Deadband point values can be reported and written
too using Object 34 variations. The deadband is the setting used to determine whether a
change event should be generated for each point. The change events can be read via
object 32 or object 60 and will be generated for any point whose value has changed by more
than the deadband setting since the last time the data value was reported.
Any analog measurement that is unavailable at the time it is read will be reported as offline,
e.g. the frequency when the current and voltage frequency is outside the tracking range of
the relay or the thermal state when the thermal protection is disabled in the configuration
column.
4.6 Object 40 analog output
The co
nversion to fixed-point format requires the use of a scaling factor, which is
configurable for the various types of data within the relay e.g. current, voltage, phase angle
etc. All Object 40 points report the integer scaling values and Object 41 is available to
configure integer scaling quantities.
4.7 DNP3.0 configuration using MiCOM S1 Studio
A PC supp
ort package for DNP3.0 is available as part of the settings and records module of
MiCOM S1 Studio. The S1 module allows configuration of the relay’s DNP3.0 response.
The PC is connected to the relay via a serial cable to the 9-pin front part of the relay - see
Introduction chapter (P54x/EN IT). The configuration data is uploaded from the relay to the
PC in a block of compressed format data and downloaded to the relay in a similar manner
after modification. The new DNP3.0 configuration takes effect in the relay after the
download is complete. The default configuration can be restored at any time by choosing ‘All
Settings’ from the ‘Restore Defaults’ cell in the menu ‘Configuration’ column. In S1, the
DNP3.0 data is displayed on a three main tabbed screens, one screen each for the point
configuration, integer scaling and default variation (data format). The point configuration also
includes tabs for binary inputs, binary outputs, counters and analogue input configuration.
Please refer to the DNP3.0 Configurator Tool User guide (S1V2DNP/EN HI/A11) for details
regarding the configuration of binary points, analogues and reporting format.
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