Schneider ATV312 inverter is one of the popular inverter lines on the market, it has good quality compared to the price along with high durability, supporting most basic control types in industry. And of course, it also has a built-in RS485 port (RJ45) to support Modbus-RTU control easily.
Today plc247.com will use MicroLogix 1400 (1766-L32BXB) PLC to control Schneider ATV312 via ModbusRTU (RS485) communication standard in the simplest & easiest.

MicroLogix 1400 – Schneider ATV312 “Wiring Diagram”
Note: Using Moduel 1763-NC01 supports easy wiring for MicroLogix 1400 PLC, or you can also connect it directly or use MiniDIN (8Pin) jack to connect to the RS485 port of the PLC

Schneider ATV312 Modbus Parameters Setting
We need to set the following communication parameters to be able to control the ATV312 Inverter by “Modbus RTU”
+ 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 RTU)
- Fr2: Mbd
- CHCF: SEP
- Cd1: Mbd
- Cd2: Mbd
Schneider ATV312 Registers Address
Note: MicroLogix 1400 Address = “VFD Address (Dec) + 1“
+ Registers for Control

>>> 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 Minitoring

>>> Output Frequency Address = 3202 + 1 = 3203
Frequency Setting Address = 3203 + 1 = 3204
Output Current Address = 3204 + 1 = 3205
Output Torque Address = 3205 + 1 = 3206
MicroLogix 1400 “Modbus RTU” Configuration
In order for MicroLogix 1400 to control Schneider ATV312 through Modbus RTU, we must set the communication parameters of the PLC to be the same as the VFD

MicroLogix-1400 Modbus Example
+ Auto Communication

+ Motor Start/Stop Command

+ Speed Setting Command

+ Data Monitoring Command

Project Video Tutorial
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Documents Reference
+ Allen Bradley MicroLogix 1400 Manual PDF Download
+ ATV312 Schneider Parameters Setting PDF
Communication Manual PDF
Modbus Address list PDF
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