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Continuing the series of instructions to control the Inovance MD200 inverter by Modbus RTU protocol, today thelivingchristmascompany.com will guide you to use the MicroLogix 1400 PLC to control it.

MicroLogix 1400 PLC has a built-in RS485 port, you can use the 1763-NC01 Expansion Module for easy wiring or direct connection is no problem.

MicroLogix 1400 & Inovance MD200 “Wiring Diagram”

+ RS485 Communication connection diagram between MicroLogix 1400 PLC and Inovance MD200

Inovance MD200 Inverter Parameters Setting

We need to set the following communication parameters to be able to control Inovance MD200 using Modbus RTU communication protocol

Inovance Inverter Registers Address

Note: PLC MicroLogix Holding Registers Address =
“VFD Address (Dec) + 1“

+ VFD Control Address = 2000 (hex) = 8192 (dec) + 1 = 8193 (dec)

• Set Word 8193 = 1 >>> Forward Run
• Set Word 8193 = 2 >>> Reverse Run
• Set Word 8193 = 6 >>> Stop

+ Set Frequency Address = 1000 (hex) = 4096 (dec) + 1 = 4097 (dec)
>>> Frequency Reference = (0 to 10000 dec) ~ (0 to VFD Max Frequency)

• Output Frequency Address = 1001 (hex) = 4097 (dec) + 1 = 4098 (dec)
• Output Voltage Address = 1003 (hex) = 4099 (dec) + 1 = 4100 (dec)
• Output Current Address = 1004 (hex) = 4100 (dec) + 1 = 4101 (dec)

MicroLogix 1400 Modbus Configuration

PLC MicroLogix Modbus Example

+ Communication Distribution

+ VFD Control Command

+ Frequency Setting Command

+ Data Monitoring

Video Tutorial

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References

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