8–6 PQM POWER QUALITY METER – INSTRUCTION MANUAL
DNP 3.0 PROTOCOL CHAPTER 8: DNP COMMUNICATIONS
8.1.3 Default
Variations
The following table specifies the default variation for all objects returned by the relay.
These are the variations that will be returned for the object in a response when no specific
variation is specified in a request.
8.1.4 Internal
Indication Bits
The following internal indication bits are supported:
DEFAULT VARIATIONS
Object Description Default Variation
1 Binary Input - Single Bit 1
2 Binary Input Change With Time 2
10 Binary Output Status 2
12 Control Relay Output Block 1
20 16-Bit Binary Counter Without Flag 5
30 16-Bit Analog Input Without Flag 2
32 16-Bit Analog Input Change Without Time 2
CHARACTER
POSITION
BIT
POSITION
DESCRIPTION
07
Device Restart -- set when PQM powers up,
cleared by writing zero to object 80
04
Need Time -- set whenever the PQM has a
“CLOCK NOT SET” alarm, cleared by setting the
clock
01
Class 1 -- indicates that class 1 events are
available
02
Class 2 -- indicates that class 2 events are
available
03
Class 3 -- indicates that class 2 events are
available
13
Buffer Overflow -- generally indicates that the
host has not picked up the event data often
enough
Courtesy of NationalSwitchgear.com
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