Good morning, everyone. I’m here again with yet another topic. Today, I would like to understand how I can set up my CODESYS project and what I need in order to change the frequencies of my inverters (I have three of them).
I want to communicate via Modbus. I know how to set it up, but I don’t understand which blocks to use in CODESYS (I’m programming in LD) and how to send signals from the PLC to the inverters — to start/stop them and to change their frequencies.
Again, these can vary drastically depending on VFD. Open the manual (and supplementary comms manual if applicable) for your VFD and read their comm tables. Some do not have a specific comm table if they allow config of the data (like an Altivar in SoMove for example).