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Siemens S7-200 “Modbus RTU” Delta MS300 VFD

Written by plc247.com

M300 series inverter is a new generation inverter from Delta, this is considered Delta’s most beautiful inverter line today. Extremely compact design, high aesthetics, outstanding performance and powerful configuration meet a variety of applications for industrial automation machines.

In addition to the basic connections required of the inverter, Delta MS300 also supports Modbus-RTU communication protocol, today plc247.com will guide you to control it with Siemens S7-200 PLC through this protocol.

Siemens S7-200 & Delta M300 “Connection Diagram”

Below is the RS485 communication connection diagram between PLC Siemens S7-200 and Delta MS300 inverter.

Delta MS300 Modbus Parameters Setting

Below are the communication parameters that need to be installed for Delta MS300 inverter to make it controllable and monitored using Modbus RTU protocol

+ P00.20 = 1 (Using Modbus Setting Frequency)

+ P00.21 = 2 (Using Modbus Control Motor)

+ P09.00 = 1 (Slave Address = 1)

+ P09.01 = 9.6 (Baudrate = 9600bps)

+ P09.02 = 3

+ P09.03 = 1.0 (Overtime Com. = 1.0s)

+ P09.04 = 14 ( Modbus-RTU 8/E/1 Selection)

Delta MS300 Modbus Registers Address
Note: Siemens S7-200 Holding Registers Address =
“VFD Address (Dec) + 40001

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

  • Set Word 48193 = 18 (dec): Forward Run
  • Set Word 48193 = 34 (dec): Reverse Run
  • Set Word 48193 = 1 (dec): Stop

>>> Frequency Setting Address = 2001 (hex) + 40001
= 8193 (dec) + 40001 = 48194 (dec)

+ Output Frequency Address = 48452 (dec)

+ Output Current Address = 48453 (dec)

+ Output Volatge Address = 48455 (dec)

PLC Programming

+ Modbus Configuration

+ Frequency Write Command

+ VFD Control Command

+ Read Data Monitoring

Project Video Tutorial

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Related Software and Documents
+ Siemens S7-200 Programming Software Download
+ Delta MS300 Inverter Manual PDF Download

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