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7.4.3 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, Analog Output Control Blocks,
and Analog Output Statuses are transmitted through DNP as signed numbers. Even for analog input points
that are not valid as negative values, the maximum positive representation is 32767.
For each point, the "Scaling and Units" column indicates the value of a transmitted 32767. This also
implies the value of a transmitted -32767. The entry in the column does not imply a valid value for the
point.
Two (2) examples are provided: In example 1, the point is un-scaled, represents kilowatts (a transmitted
number 5 represents 5kW), and its valid range is from 0 to 10,000kW (meaning that the transmitted
number will never exceed 10,000).
In example 2, the point transmits A/D counts from a measurement of voltage. The valid range is –2048 to
2047 counts (the limits of the physical A/D converter), which represents -12V to +12V. For this point, the
representation of 32767 A/D counts, even though it is not a valid value for the point, is:
(12/2047) * 32767 = 192V
Always indicating the representation of 32767 in the tables below is a consistent method for representing
scale, applicable to all scaling possibilities.
The "Default Deadband" column is used to represent the absolute amount by which the point must change
before an analog change event will be generated. The "Default Change Event Assigned Class" column is
used to represent the class (1, 2, 3, or none) in which detected change events will be reported. Only the
default values for these columns are documented here because the values may change in operation due to
either local (user-interface) or remote (through DNP) configuration control.
Analog Inputs
Static (Steady-State) Object Number:
Change Event Object Number:
Reporting Deadband Object Number:
Request Function Codes supported:
Static Variation reported
when variation 0 requested:
Change Event Variation reported
when variation 0 requested:
Reporting Deadband Variation reported
when variation 0 requested:
Change Event Scan Rate:
Point
Name/Description
Index
0
Communication Firmware Rev.
1
DNP Rev.
2
AT Firmware Rev.
3
Voltage Rating
4
Current Rating
5
Voltage
6
Current
7
Equalize Time Remaining
8
Error Number
9
Battery temperature
30
32
34
1 (read), 2 (write, deadbands only), 22 (assign class)
2 (16-Bit Analog Input)
2 (Analog Change Event Without Time)
1 (16-Bit Reporting Deadband)
Scaling and Units
(representation of 32767)
327.67
3.2767
327.67
32767 Volts
32767 Amperes
3276.7 Volts
3276.7 Volts
32767 Hrs
32767
32767 °C
DNP V3.00
Reporting
Initial Change Event
Deadband
Class (1, 2, 3 or none)
1
2
1
2
1
2
1
2
1
2
10
2
20
2
1
2
1
2
1
2
27
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