AC500 PM583 ETH PLC to ACS 550 Drive modbus Communication Issue
We are using Moxa MB3280 converter in between drive and PLC. The communication will be ok until start the drive.if enable external drive start input immediately drive communication dropping not transfer reference to deceive. If I do same in local mode and do start enable the drive the communication drops.
We are using moxa to drive RS485 3 wire connection with baud rate 19.2kbs .from moxa to PLC TCP. LINK.
please can any one has idea why its dropping and how to rectify.
Thanks and Regards
Sankar
We are using moxa to drive RS485 3 wire connection with baud rate 19.2kbs .from moxa to PLC TCP. LINK.
please can any one has idea why its dropping and how to rectify.
Thanks and Regards
Sankar
Asked 6 months ago
Answers
0
Dear sankar,
Kindly try this method:
1.Connect your laptop and VFD through USB to MODBUS converter.
2.Run the MODSCAN software in your laptop.
3.wirte the start command and speed reference manually on the appropriate MODBUS registers.
4. If drive accepts your MODSCAN commands , there is no problem in your drive program side
The next step will be on your PLC program side.
5.Otherwise do the correction on your VFD MODBUS programming side then check your PLC program .
Kindly try this method:
1.Connect your laptop and VFD through USB to MODBUS converter.
2.Run the MODSCAN software in your laptop.
3.wirte the start command and speed reference manually on the appropriate MODBUS registers.
4. If drive accepts your MODSCAN commands , there is no problem in your drive program side
The next step will be on your PLC program side.
5.Otherwise do the correction on your VFD MODBUS programming side then check your PLC program .
Answered 6 months ago
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