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Goals and Symptoms
How to control an Altivar312 (ATV312) drive with a Twido PLC via Modbus RTU?
Causes and Fixes
Below is a step by step procedure describing a small application using a Twido Compact PLC controlling an ATV312 drive connected via Modbus RTU. A program example can be found at the end of this procedure.
Hardware and software used:
- TWDLCAE40DRF Twido PLC
- TWDNAC485T (RS485 serial interface adaptor with 3 pin screw terminal type connector)
- TwidoSuite 2.30.007 (free to download from www.schneider-electric.com)
- ATV312H075M2 variable speed drive
WIRING CONSIDERATIONS FOR THE MODBUS NETWORK
ATV312 RJ45 connector pin 4 - A terminal of the Twido TWDNAC485T
ATV312 RJ45 connector pin 5 - B terminal of the Twido TWDNAC485T
ATV312 RJ45 connector pin 8 SG terminal of the Twido TWDNAC485T
The Altivar 312 control process using the communication bus is based on the CANopen CiA 402 profile status chart compatible with the IEC61800-7 standard. Each state represents an aspect of the internal behavior of the drive.
In practical terms, before you can start the motor you will have to write to the CMD command word, Modbus address 8501, a value of 16#0006 (drive goes to a Ready to switch on state that can be checked with ETA status word, Modbus address 3201), then a 16#0007 (drive goes to a Switched on state) and finally a 16#000F (drive goes into an Operation enabled state, drive running).
Please refer to the chart and description of the states at the end of this document.
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