3.8 COUNTERS/
FROZEN COUNTERS
Counter Group Number:
20
Frozen Counter Group
Number: 21
Counter Event Group
Number: 22
Frozen Counter Event
Group Number: 23
Capabilities
(leave tick-boxes blank if
this data type is not
supported)
Current Value
If configurable, list
methods
3.8.1 Static Counter Variation reported when variation 0 requested or in response to Class polls:
● Variation 1 – 32-bit
with flag
Five
PST or LHMI
(Obj20DefVar)
● Variation 2 – 16-bit
with flag
● Variation 5 – 32-bit
without flag
● Variation 6 – 16-bit
without flag
○ Based on point Index
(add column to table in
part 5)
3.8.2 Counter Event Variation reported when variation 0 requested or in response to Class polls: Note:
The support for counter events can be determined remotely using protocol object Group 0 Variation 227.
● Variation 1 – 32-bit
with flag
One
PST or LHMI
(Obj22DefVar)
● Variation 2 – 16-bit
with flag
● Variation 5 – 32-bit
with flag and time
● Variation 6 – 16-bit
with flag and time
○ Based on point Index
(add column to table in
part 5)
3.8.3 Counters included in Class 0 response:
● Always
○ Never
○ Only if the point is
assigned to a class
○ Based on point Index
(add column to table in
part 5)
3.8.4 Counter Event reporting mode: When responding with event data and more than one event has
occurred for a data point, an Outstation may include all events or only the most recent event. Only the
most recent event is typically reported for Counters. When reporting “only most recent”, the counter value
reported in the response may be the value at the time of the original event or it may be the value at the
time of the response.
Table continues on next page
1MRK 511 419-UUS A
Section 3
DNP3 protocol implementation
650 series 2.2 ANSI
57
Point list manual
