D.2.3 Counters - GE L90 Instruction Manual

APPENDIX D
The following table lists both Binary Counters (Object 20) and Frozen Counters (Object 21). When a freeze function is per-
formed on a Binary Counter point, the frozen value is available in the corresponding Frozen Counter point.
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),
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: 2
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: 2
Table D–5: BINARY AND FROZEN COUNTERS
POINT NAME/DESCRIPTION
INDEX
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
A counter freeze command has no meaning for counters 8 and 9. L90 Digital Counter values are represented as 32-bit inte-
gers. The DNP 3.0 protocol defines counters to be unsigned integers. Care should be taken when interpreting negative
counter values.
GE Multilin
10 (freeze and clear, noack), 22 (assign class)
L90 Line Differential Relay
D.2 DNP POINT LISTS

D.2.3 COUNTERS

D-15
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