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Siemens S7-200 “Modbus RTU” Inovance MD200 VFD

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The Inovance MD200 inverter is a versatile, compact inverter that is widely applied thanks to its good quality, stable and durable operation but at a very low price.

Inovance supports most of the basic inverter connections such as I/O Terminal, Analogue and also supports control via Modbus-RTU communication protocol. Today will guide you to use Siemens S7-200 PLC to control it through this protocol

Siemens S7-200 & Inovance MD200 “Wiring Diagram”

Below is a diagram of Modbus rs485 communication connection between Siemens S7-200 and Inovance MD200 inverter.

Inovance MD200 Modbus Parameters Setting

In addition to the basic parameters of the inverter (frequency, current, voltage…) we need to install the following communication parameters so that the Inovance MD200 inverter can be controlled by Modbus-RTU protocol.

Inovance MD200 Registers Address Table
Note: Siemens S7-200 Holding Registers Address =
“VFD Address (Dec) + 40001”

>>> VFD Control Address = 2000(hex) = 8192(dec) + 40001 = 48193 (dec)

  • Set Word “48193” = 1 >>> Forward Run
  • Set Word “48193” = 2 >>> Reverse Run
  • Set Word “48193” = 6 >>> Stop

>>> Set Frequency Address = 1000 (hex) = 4096(dec) + 40001 = 44097 (dec)

  • Frequency Reference = (0 to 10000 dec) ~ (0 to VFD Max Frequency)

+ Output Frequency Address = 1001(hex) = 4097(dec) + 40001 = 44098 (dec)

+ Output Voltage Address = 1003(hex) = 4099(dec) + 40001 = 44100 (dec)

+ Output Current Address = 1004(hex) = 4100(dec) + 40001 = 44101 (dec)

PLC Programming

+ Read / Write Distribution

+ Port.0 Modbus Configuration

+ Frequency Setting Command

+ VFD Control Command

+ Read Data Monitoring

Project Video Tutorial


Related Software and Documents
+ Download Siemens S7-200 Programming Software
+ Download Inovance MD200 Manual PDF

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If in the process of using the Siemens S7-200 PLC to control the Inovance MD200 inverter with Modbus RTU you need any support, please comment below the article, will reply to you as soon as I read the comments.

Thanks and Best Regards!

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