Operating Instructions 27
Name
SNVT Type
Units
SNVT# Description
General Variables (NodeObject)
nciCtAmps*
SNVT_amp_ac
1 amp
0
CT rated current
nviRequest
SNVT_obj_request
1
L
on
M
ark
object request
nviTimeSet*
SNVT_time_stamp
2
Set current date/time
nviFileReq
SNVT_file_req
3
File transfer request
nviFilePos
SNVT_file_pos
4
File transfer position
nviResetEnergy
SNVT_count
5
Write “1” to zero all resettable energy
variables
nvoStatus
SNVT_obj_status
6
L
on
M
ark
object status
nvoFileStat
SNVT_file_status
7
File transfer status
Energy Variables
nvoEnergySum*
SNVT_elec_kwh_l
0.1 kWh
14
Total net (bidirectional) energy
nvoEnergySumNR*
SNVT_elec_kwh_l
0.1 kWh
15
Total net (bidirectional) energy
- non-resettable
nvoEngyPosSum*
SNVT_elec_kwh_l
0.1 kWh
16
Total positive energy
nvoEngyPosSumNR* SNVT_elec_kwh_l
0.1 kWh
17
Total positive energy - non-resettable
nvoEnergyA*
SNVT_elec_kwh_l
0.1 kWh
18
Net energy, phase A
nvoEnergyB*
SNVT_elec_kwh_l
0.1 kWh
19
Net energy, phase B
nvoEnergyC*
SNVT_elec_kwh_l
0.1 kWh
20
Net energy, phase C
nvoReacEngySum*
SNVT_elec_kwh_l
0.1 kVARh
21
Total net reactive energy
Power Variables
nvoPowerSum
SNVT_power_f
watts
33
Real power, sum of phases
nvoPowerA
SNVT_power_f
watts
34
Real power, phase A
nvoPowerB
SNVT_power_f
watts
35
Real power, phase B
nvoPowerC
SNVT_power_f
watts
36
Real power, phase C
Network Variables
The WattNode meter uses
L
on
M
ark
®
interoperable SNVTs (Standard Network Variable Type) and
is programmed with self-documentation information. It is supplied with an external interface file
(XIF), which defines all of the network variables and transceiver parameters. The XIF file may be
requested by network management software during installation and is particularly useful if you
wish to configure the network software for a meter before physically installing it.
WattNode meter network variable names are prefixed with three letters indicating the type:
●
nvi
- Input to the meter, but may also be read.
●
nvo
- Output from the meter.
●
nci
- Configuration network variable; normally inputs to the meter, but may be read to deter-
mine the current configuration. Configuration variables are preserved during power outages.
Authentication
For installations where the WattNode will be used for billing, the network variables
nviTimeSet
,
nciCtAmps
,
nviResetEnergy
,
nviResetPkDemand
,
nciDemPerMins
, and
nciDemSubints
should be protected from unauthorized tampering. The LonTalk protocol supports authentication
to prevent unauthorized access for specified variables. You must enable authentication with your
network management software. Once protected, the authentication key is required to access
these variables, so be sure to record the key securely.
