Today is...
Thursday, February 22, 2018
Welcome to, the global online
community of automation professionals.
Featured Video...
Featured Video
A demonstration of EtherCAT control of linear motors using the CTC EtherCAT master.
Our Advertisers
Help keep our servers running...
Patronize our advertisers!
Visit our Post Archive
Troubleshooting Modbus communications for a PLC
Troubleshooting Steps for Comm Status 2

New to MODBUS, wired up a new device and have it correctly wired, just can't get from Comm Status 2 to 8. Any suggestions on things I can try? I have tried conversion codes and modifying the number of holding registers but no success thus far. When checking diagnostics, I am transmitting and receiving. Just looking for more steps to try.


It would help the people reading this forum if you would tell them what type of PLC you are using.

Peg, your friendly local moderator