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WattNode for Lonworks



WattNode® LonWorks® – Downloads

These downloads apply to the following two families of WattNode meters for the LonTalk protocol:


  • WattNode LonWorks
  • WattNode Revenue for LonWorks
  • WattNode Logger for LonWorks


Sales Brochure



Manuals, Technical Documents, and XIF File

Short and long versions of manuals are available and apply to both the WattNode Plus for LonWorks and WattNode Revenue for LonWorks models.

Installation Guide The following short installation guide applies for all LonWorks models and options and is intended for the electrician or electrical installer, as well as anyone doing network wiring.


Reference Manuals These are the long (40-50 page) manuals that provide detailed installation, operation, and reference information for the different WattNode for LonWorks meters.

WattNode Plus for LonWorks


WattNode Logger for LonWorks


WattNode Plus for LonWorks – Option B



Manual Supplements




The WattNode® meter for LonWorks is a kilowatt-hour (kWh) energy and power (kW demand) meter that communicates on a LonWorks® network and measures 1, 2, or 3 phases with voltages from 120 to 600 Vac and currents from 5 to 6,000 amps in delta (line-to-line) and wye (line-to-neutral) configurations. For built-in data logging, see the WattNode Logger for LonWorks.




  • Net Real Energy: kilowatt-hours (phase A, B, C, sum of all phases)
  • Positive Real Energy: kilowatt-hours (phase A, B, C, sum of all phases)
  • Bidirectional Real Power: Watts (phase A, B, C, and sum of all phases)
  • Reactive Power: VARs (phase A, B, C, and sum of all phases)
  • Power Factor: PF (phase A, B, C, all phases)
  • Reactive Energy: kVAR-hours (sum of all phases)
  • AC Frequency
  • RMS Voltage: (phase to neutral A, B, C)
  • Computed RMS Current: (phase A, B, C)
  • Demand kW
  • Peak Demand kW


WattNode Plus—Features


WNC FT10 WNC FT10-L RWNC FT10 Features
    Meets the accuracy requirements of the ANSI C12.1 standard
      Data Logging model –L. See the Option Tab.
Supports LonWorks TP/FT-10 twisted-pair free topology network using Echelon’s® LonTalk® (ANSI/CEA-709.1-B-2002) network protocol.
LonMark® 3.4 Certified
Small form factor for easy installation inside most electrical panels, see a example WattNode for LonWorks Installation Example.
Pluggable screw terminals for easy wiring
Nominal accuracy 0.5%—See the Reference Manual  (PDF, 43 pages) for details
True RMS power even with leading or lagging power factor and chopped or distorted waveforms
Measure variable speed motor drives used in HVAC, refrigeration, and pumping systems

Safe CT’s (Current Transformers), output 0.333 Vac at rated current.

  • Split core CTs for quick installation
  • Solid core CTs are less expensive and prevent tampering
  • CTBL large split-core CTs for high currents (standard and custom sizes)
  • CTRC Rogowski Coils for tight spaces where rigid CTs do not fit
Assembled in USA, qualified under the Buy American provision in the American Recovery and Reinvestment Act of 2009 (ARRA).
Five year warranty


WattNode for LonWorks—Specifications

These specifications apply to the following families of WattNode® meters with the LonTalk® protocol:


  • WattNode Plus
  • WattNode Plus Revenue




  • Line powered
  • Operating Voltage Range: –20% to +15% of the nominal rated voltage
  • Power Line Frequency: 50 or 60 Hz
  • CT Input: 0.333 Vac nominal, 0 to 0.5 Vac operating, 3 Vac maximum


Measurement Configurations


  • Single phase: two or three wire
  • Three phase, four wire wye
  • Three phase: three wire delta
  • Three phase: four wire delta




  • Protocol: Echelon’s® LonTalk® (ANSI/CEA-709.1-B-2002, EN 14908, GB/Z 20177.1-2006)
  • Transceiver: Echelon TP/FT-10
  • Bit Rate: 78 kbps
  • Maximum Nodes: 64 per subnet
  • Maximum Distance:
    • Free Topology: 500 meters
    • Bus Topology: 2700 meters
  • Maximum Stub Length:
    • Free Topology: Unlimited
    • Bus Topology: 3 meters




WattNode Plus for LonWorks


  • 0.5% nominal (see manuals for details)


WattNode Logger for LonWorks


  • 0.5% nominal (see manuals for details)
  • Clock accuracy: ± 2 minutes per year (battery backed)


WattNode Revenue for LonWorks


  • 0.5% nominal (see manual for details)
  • Meets accuracy requirements of the ANSI C12.1 standard when used with CCS CTs rated for IEEE C57.13 class 0.6 accuracy (see Revenue Grade CTs).


Data Logging Model –L

This model is only available on standard model WattNode for LonWorks. The data logging model is for special applications where the LonTalk network is not available or not reliable. Order the logging model by adding a –L to the end of the part number. For example: WNC-3Y-208-FT10-L.

The data logging model provides internal logging to non-volatile memory. Logging intervals can be selected from 1 minute to 12 hours. Memory allows logging of up to 250 days of 15-minute data. The logged values are:


  • Date and Time
  • Net Energy (A, B, C and Sum)
  • Reactive Energy (Sum)
  • Positive Energy (Sum)
  • Real and Reactive Power (A, B, C and Sum)
  • Voltage, Current and Power Factor (A, B, C)
  • Demand




  • FCC Class B, EN 55022 Class B
  • UL and cUL Listed (UL 61010-1), file number E312220
  • CE Mark and RoHS Declaration of Conformity
  • Immunity: EN 61326: 2002 (Industrial Locations)




  • Operating Temperature: –30° to 55°C
  • Humidity: Up to 90% RH (non-condensing)




Case Dimensions (Click on the image for a larger view.)


  • Enclosure:High impact, ABS plastic
    • High impact, ABS plastic
    • Flame Resistance Rating: 94V-0, IEC FV-0
    • Size: 6.1 × 3.35 × 1.5 in. (155 × 85 × 38.1 mm)
  • Weight: 10.4 oz (295 g)
  • Connectors: Euroblock style pluggable screw terminal blocks
  • Green: 22 to 12 AWG (0.32 to 2.5 mm2), 600 V
  • Black: 22 to 12 AWG (0.32 to 2.5 mm2), 300 V
  • Screw torque 4.4 lbf·in (0.5 N·m)


WattNode® Plus for LonWorks® – Model Part Numbers


Standard Model Logger Model Revenue Model Vac Line to Neutral Vac Line to Line Electrical Service Types Neutral Required
120 208-240 Single-Phase 120V with neutral Single-Phase 3-Wire 120/240V 3-Phase 4-Wire Wye 120/208V Yes
230 400 Single-Phase 230V with neutral 3-Phase 4-Wire Wye 230/400V Yes
277 480 Single-Phase 277V with neutral 3-Phase 4-Wire Wye 277/480V Yes
347 600 Single-Phase 347V with neutral 3-Phase 4-Wire Wye 347/600V Yes
See below 208-240 Single-Phase 208V (No neutral) Single-Phase 240V (No neutral) Single-Phase 3-Wire 120/240V 3-Phase 3-Wire Delta 208V–240V (No neutral) 3-Phase 4-Wire Wye 120/208V  
See below 400 3-Phase 3-Wire Delta 400V (No neutral) 3-Phase 4-Wire Wye 230/400V  
See below 480 3-Phase 3-Wire Delta 480V (No neutral) 3-Phase 4-Wire Wye 277/480V  


  • Voltage Ranges listed in table are -20% to +15% of nominal. For 3D-240 models, this is -20% of 208 Vac (166 Vac) to +15% of 240 Vac (276 Vac). Operating Frequencies: 50/60 Hz
  • Delta models (3D in part number) work either with or without a neutral connection, but require a line-to-line voltage connection for operating power.


Network Services Support



Firmware Upgrade



Option Specific Downloads


WattNode Plus Only


Option B – Emulates the legacy WNB-xx-xxx-FT10 series of WattNode meters
See WattNode for LonWorks – Option B for downloads.


WattNode Plus and WattNode Logger Only

Option PT – Allows monitoring higher voltage services.
See WattNode LonWorks – Option PT for downloads.


WattNode® for LonWorks® – Options


Option CT


This option configures the network variable nciCtAmps to the specified CT rated current. The format is: Option CT=xxxx where xxxx is the rated current of the CT. See the WattNode for LonWorks – Option CT page for details. The nciCtAmp variablecan be field configured or overridden by the user.


Option PT

This option is available only with the standard WattNode Plus and WattNode Logger models.

Option PT provides support for potential transformers (PTs), making it easier to use the WattNode for LonWorks meters with medium voltage services. Specifically, Option PT adds a configuration property UCPTptRatio which configures the ratio of the external PT, allowing the meter to automatically scale the voltage, power, and energy readings. See WattNode LonWorks – Option PT for more information.


Option B

This option is available only with the standard WattNode for LonWorks meter.
If you need a WattNode meter that behaves like the old WNB series models (model numbers WNB-xx-xxx-FT10), then order a

WNC-xx-xxx-FT10 Opt B

The Option B WattNode models are very similar to the original WNB series WattNode Plus models, but with a few changes:


  • New program ID: 8:00022:1500:0A04:05. Because there are some hardware changes, LonMaker® requires a new program ID.
  • Energy and time of day are stored to non-volatile memory every 5 seconds. The old version stored these every 20 seconds.
  • The energy log has been removed (see our WattNode Logger for LonWorks if you need logging). The nviLogRequest and nvoLogData variables still exist, but do nothing.
  • The network variable list is identical to the original WNB series WattNode Plus
  • Firmware Version 3.03


Support Information


Warning: Hazardous Voltages – Only qualified personnel or licensed electricians should install the WattNode meter and current transformers.