4-12
UR FAMILY – COMMUNICATIONS GUIDE
DNP POINT LISTS
CHAPTER 4: DNP COMMUNICATION
4
4.2.3 Counters
The following table lists both Binary Counters (Object 20) and Frozen Counters (Object 21). When a freeze function is
performed on a Binary Counter point, the frozen value is available in the corresponding Frozen Counter point.
Table 4-4: Binary and frozen counters
A counter freeze command has no meaning for counters 8 and 9. UR Digital Counter values are represented as 32-bit
integers. The DNP 3.0 protocol defines counters to be unsigned integers. Care should be taken when interpreting negative
counter values.
4.2.4 Analog inputs
he DNP analog input data points are configured through the
PRODUCT SETUP
COMMUNICATIONS
DNP / IEC104 POINT
LISTS
ANALOG INPUT / MME POINTS
menu. See the Communications section of chapter 5 in the Instruction Manual for
details.
It is important to note that 16-bit and 32-bit variations of analog inputs 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 16-bit
values and 2147483647 for 32-bit values. This is a DNP requirement.
BINARY COUNTERS
Static (Steady-State) Object Number:
20
Change Event Object Number:
22
Request Function Codes supported:
1 (read), 7 (freeze), 8 (freeze noack), 9 (freeze and clear),
10 (freeze and clear, noack), 22 (assign class)
Static Variation reported when variation 0 requested:
1 (32-Bit Binary Counter with Flag)
Change Event Variation reported when variation 0 requested:
1 (32-Bit Counter Change Event without time)
Change Event Buffer Size:
10
Default Class for all points:
3
FROZEN COUNTERS
Static (Steady-State) Object Number:
21
Change Event Object Number:
23
Request Function Codes supported:
1 (read)
Static Variation reported when variation 0 requested:
1 (32-Bit Frozen Counter with Flag)
Change Event Variation reported when variation 0 requested:
1 (32-Bit Frozen Counter Event without time)
Change Event Buffer Size:
10
Default Class for all points:
3
Point
index
Name/Description
0
Digital Counter 1
1
Digital Counter 2
2
Digital Counter 3
3
Digital Counter 4
4
Digital Counter 5
5
Digital Counter 6
6
Digital Counter 7
7
Digital Counter 8
8
Oscillography Trigger Count
9
Events Since Last Clear
