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Micrologix 1100 “Modbus RTU” Schneider ATV312 VFD

Written by plc247.com

The Atival 312 is an extremely powerful inverter from Schneider Electric with a power range of 0.18 to 15kW. It also supports various industrial control methods.

Today plc247.com would like to write a tutorial for you to use MicroLogix 1100 PLC to control Schneider ATV312 via “Modbus RTU” RS 485

Micrologix 1100 & Schneider ATV312 “Wiring”

Schneider ATV312 Modbus RTU Settings

In addition to the basic parameters of the inverter, we need to set the communication parameters as follows:

  • “CON” Menu

+ Add: 1 (Slave Address= 1)

+ tbr: 9.6 (Baudrate = 9600bps)

+ tF0: 8E1

+ tt0: 3.0 (Comm. timer check Error)

  • “CtL” Menu

+ LAC: L3

+ Fr1: Mdb (Modbus)

+ Fr2: Mbd

+ CHCF: SEP

+ Cd1: Mbd

+Cd2: Mbd

Register for Control
Note: MicroLogix 1100 Address = “VFD Address (Dec) + 1

>>> Motor Control Address = 8501 + 1 = 8502

+ Set Word 8502 = 128 : VFD Fault Reset
= 6 : VFD System Start
= 15 : Motor Forward Run
= 2063 : Motor Reverse Run
= 4111 : Stop

>>> Frequency Reference Address = 8052 + 1 = 8053

Register for Monitoring
  • Output Frequency Address = 3202 + 1 = 3203

MicroLogix 1100 Programming

+ Channel Configuration

+ Auto Read/Write Distribution

+ Control Command

+ Set Frequency Command

+ Read Data Response Command

Project Videl Tutorial

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