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MicroLogix 1400 “Modbus RTU” INVT GD20 Tutorial

Written by plc247.com

The GD20 is a versatile, compact, easy-to-use open-loop inverter with outstanding responsiveness for almost all applications. Its great advantage is that it is extremely cheap, but it supports most basic control and connection types, including Modbus RTU (via the built-in RS485 port).

Today plc247.com will guide you to use MicroLogix 1400 PLC (Model: 1763-L32BXB) to control INVT Goodrive 20 Inverter through Modbus-RTU communication standard

MicroLogix 1400 & INVT GD20 “Connection Diagram”

+ Use Module 1763-NC01 for easy wiring as shown in the diagram below or you can also connect it serially to the RS485 port of the PLC (Mini DIN – 8Pin)

INVT Goodrive 20 Modbus Parameters Setting

In order for the INVT GD20 inverter to communicate with Modbus-RTU, in addition to the basic parameters set by the motor (Voltage, Current, Frequency…) we need to set the following communication parameters:

+ P00.01: 2 (Frequency Reference via RS485)

+ P00.06: 8 (Motor Control via RS485)

+ P00.09: 0 (A Frequency Selection)

+ P14.00: 1 (Slave Address: 1)

+ P14.01: 3 (9600bps)

+ P14.02: 1 (Modbus RTU 8/E/1)

+ P14.03: 5

+ P14.04: 0.0

INVT GD20 Registers Address for Control
Note: MicroLogix 1400 Address = “VFD Address (Dec) + 1

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

+ Set Word 8193 = 1 >>> Forward Run
= 2 >>> Reverse Run
= 5 >>> Stop

>>> Frequency Reference Address = 2001 (hex) + 1
= 8193 + 1 = 8194

INVT GD20 Registers Address for Monitoring

+ Output Frequency Address = 3000 (hex) + 1 = 12288 (dec) + 1 = 12289

+ Setting Frequency Address = 12290

+ DC-BUS Voltage Address = 12291

+ Output Volatge Address = 12292

+ Output Current Address = 12293

MicroLogix 1400 “Modbus RTU” Configuration

We need to configure the communication parameters of the MicroLogix 1400 PLC to be the same as those installed in INVT Goodrive 20 VFD

PLC Programming

+ Read/Write Auto Distribution

+ VFD Start/Stop Control

+ VFD Frequency Setting

+ Read VFD Data Output

Video Tutorial for Project

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References

>>> Download MicroLogix 1400 Manual PDF

>>> INVT Goodrive20 Manual PDF Download

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