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Mitsubishi FX5U “Modbus RTU” Schneider ATV312 Tutorial

Written by plc247.com

Hello, in previous posts plc247.com guided you to use PLC FX5U to control many different types of inverters through Modbus-RTU RS485.

Today plc247.com continues to guide you to use Mitsubishi FX5U to control Schneider ATV312 Inverters, both of which have built-in RS485 Port.

FX5U & Schneider ATV312 “Connection Diagram”

Note: Use a 120Ω terminal resistor if the communication distance is far

Schneider ATV312 Modbus RTU Setting

To be able to control Schneider ATV312 with Modbus RTU, we need to set the following parameters

+ “COM” Menu

  • Add = 1 (Slave No.1)
  • tbr = 9.6 (baudrate)
  • tF0 = 8E1 (Communication Config)
  • tt0 = 3.0 (timer Com. error check)

+ “CtL” Menu

  • LAC = L3
  • Fr1 = Mdb (Modbus)
  • Fr2 = Mdb
  • CHCF = SEP
  • Cd1 = Mdb
  • Cd2 = Mdb
Schneider ATV312 Registers for Control

>>> VFD Control Address = 8501 (decimal) = 2135 (hexa)

+ Set Word 2135 (hex) = 128 >>> System Reset
= 6 >>> System Start
= 15 >>> Forward Run
= 2063 >>> Reverse Run
= 4111 >>> Stop

>>> VFD Frequency Reference Address = 8502 (decimal) = 2136 (hexa)

Schneider ATV312 Registers for Monitoring

>>> Output Frequency Address = 3202 (decimal) = C82 (hexa)

PLC FX5U Modbus RTU Configuration

It is necessary to set the Modbus RTU communication parameters at the RS485 port the same as those installed on the ATV312 inverter

Mitsubishi FX5U Modbus Example

+ Read / Write Distribution

+ VFD Control Command

+ VFD Data Monitoring

Project Video Tutorial

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Related Software and Documents

+ Download Mitsubishi GX Works3 Software

+ Download Schneider ATV312 Manual PDF (Password Extract: plc247.com)

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