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LabView “Modbus RTU” Danfoss FC51 Tutorial

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LabView is software commonly used for data acquisition, device control, and industrial automation. It supports all industrial communication protocols including Modbus RTU.

Today would like to guide you to use Labview software to control Danfoss FC51 inverter via RS485 Port.

Computer & Danfoss FC51 “Connection Diagram”

We need to prepare USB to RS485 Cable so that the computer can connect to Danfoss FC51

Danfoss FC51 Modbus RTU Configuration

In addition to the basic parameters of the inverter installed according to the motor (Frequency, current, voltage …) then we need to install the following parameters to be able to control Danfoss FC51 with Modbus RTU

Danfoss FC51 Registers for Control

+ VFD Control Address = 49999 (dec)

  • Set Register 49999 = 1148 (dec) >>> Forward Run
    = 33916 (dec) >>> Reverse Run
    = 1084 (dec) >>> Stop
    = 1212 (dec) >>> VFD Reset

+ Frequency Reference Address = 50009 (dec)

  • Reference Setting = 0 to 16384(dec) ~ (0 to 100%)
Danfoss FC51 Registers for Monitoring

+ Output Voltage Address = 16119 (dec)

+ Output Frequency Address = 16129 (dec)

+ Output Current Address = 16139 (dec)

LabView Modbus-RTU Example

+ Front Panel Design

+ Block Diagram Programming

Project Video Tutorial


Related Software and Documents

+ Danfoss FC51 Manual PDF Download

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If you have any questions about connecting the LabView software to control Danfoss FC51 inverters, please comment below the article, will answer you as soon as I read the comments.

Best Regards!

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