Hello everyone, PLC Mitsubishi FX5U is a new generation PLC integrated with many modern features such as Ethernet, RS485, Analog communication ports… And it also integrates Modbus-RTU Communication Method
- PLC Keyence “Modbus RTU” Danfoss FC302 Tutorial
- Mitsubishi FX5U “Modbus RTU” PowerFlex525 VFD Tutorial
Today plc247.com will guide you to use FX5U to control Danfoss FC302 via Modbus-RTU (Danfoss FC302 inverter also has built-in RS485 port)
Mitsubishi FX5U & Danfoss FC302 “Wiring Diagram”
Note: If the communication distance is longer than 20m, a 120Ω terminal resistor should be used
Danfoss FC302 Modbus-RTU Configuration
In addition to the basic parameters of the inverter (Frequency, current, voltage…) then we need to set the communication parameters as the table below to be able to control Danfoss FC302 with Modbus RTU
Danfoss FC302 Register for Control
>>> VFD Control Command = C34F (hex)
+ Set Word C34F = 47C (hex) >>> Run Forward
= 847C (hex) >>> Run Reverse
+ Set Word C34F = 43C (hex) >>> Stop
+ Set Word C34F = 4BC (hex) >>> VFD Reset
>>> Speed Reference Address = C359 (hex)
+ Speed Reference = 0 to 16384(dec) ~ (0 to 100%)
Danfoss FC302 Registers for Monitoring
Note: Danfoss FC302 Address = “(Table Address*10) – 1“
+ Voltage Output Address = 16119 (dec)
+ Frequency Output Address = 16129 (dec)
+ Current Output Address = 16139 (dec)
+ Speed Output Address = 16169 (dec)
Mitsubishi FX5U Modbus RTU Setting
We need to configure Modbus communication parameters in PLC same as Danfoss FC302
FX5U PLC Programming
+ Read / Write Distribution
+ Speed Setting Command
+ VFD Control Run
+ Read Data Response
Detailed Instruction Video
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Related Software and Documents
>>> Download GX Works3 Mitsubishi Software
>>> Download Danfoss FC302 Manual PDF
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If you have any problems in the process of connecting PLC FX5U with Danfoss FC302 VFD, please comment below the article, plc247.com will reply to you as soon as I read your comments.
Best Regards!
Buenos días, disculpa la molestia, estoy batallando con la conexión del puerto RS-485 de la HMI GS2107-WTBD-N de mitsubishi, la estoy tratando de comunicar con el PLC FX5U para el control de un variador Danfoss pero no logro establecer bien la cominicación
please comment via english
Hi, can you use Fx5-485ADP and the built in 485 port to read modbus register from 2 different devices?
I have more than 32 device I want to read via modbus RTU.
I have read the manual for modbus rtu communication and from my understanding is that you can use them both by changing the host number setting to latch and changing the value of the special register. Is that how you do it?
thank you
yes maximum 32 slaves
thank you kind sir
thanks you sir