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PLC Keyence “Modbus RTU” Danfoss FC302 Tutorial

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Hello friends, in previous posts guided you to use some PLC / HMI and also PC to control Danfoss FC302 inverter via Modbus RTU RS485

Today will guide you to use the Keyence KV Series PLC in combination with the KV-L21V Module (supports Modbus RTU) to control Danfoss FC302

Keyence KV-L21V & Danfoss FC302 “Wiring Diagram”

Note: If the communication distance is far, we need to add a 120Ω Terminal Resistor

Danfoss FC302 Modbus RTU Configuration

To be able to control the inverter by Modbus RTU we need to set the following communication parameters

Registers for Control

>>> VFD Control Address = C34F (hex)

  • Set Word 50000 = 1148 (dec) >>> Run Forward
    = 33916 (dec) >>> Run Reverse
    = 1084 (dec) >>> Stop
    = 1212 (dec) >>> VFD Reset

>>> VFD Speed Setting = C359 (hex)

  • Speed Reference = 0 to 16384 (dec) ~ (0 to 100%)
Register for Monitoring
  • Voltage Output Address = 16119 (dec) = 3EF7 (hex)
  • Frequency Output Address = 16129 (dec) = 3F01 (hex)
  • Current Output Address = 16139 (dec) = 3F0B (hex)
  • Speed Output Address = 16169 (dec) = 3F29 (hex)

PLC Keyence Modbus-RTU Setting

We need to set the communication parameters of Keyence KV-L21V and Danfoss FC302 the same.

PLC Keyence Programming

+ Read / Write Distribution

+ VFD Speed Setting

+ VFD Control Command

+ Data Response Monitoring

Project Video Tutorial


Related Documents and Software:

>>> PLC Keyence Software Download
>>> Danfoss FC302 Manual PDF Download

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