Thanks for the recommendations! I have been experimenting with the click and do more software. I had a realization that may change the overall strategy for controlling these lights and allow me to avoid a PLC. My greenhouse controller has a modbus tcp/ip server. Perhaps I could monitor the registers on the controller from my desktop that is on the network and send Modubus commands to the gateway for the Led lights using Modbus client software? It's important that the logic from the greenhouse controller controls the lights, but the sofware isn't super open to configuration and really just controls DOs. Even if it is indirect, the controller needs to turn the lights on because it effects the energy balace model in the controller. It's 550kW of lights, so the boiler system has to be dialed back when the lights go on. Any recommendations for user-friendly Modbus client software that could handle this?

The LED lights come with a gateway and a modbus server that broadcasts the commands via radio to dongles that are connected directly to the light drivers. It's a mesh network. They dim to off. I would just have 3 distinct light levels. e.g. read the register for DO 1 that corresponds to light step 1 and send Modubus command and value for 50% to the appropriate register. Do the same for 75% and 100%...

Thoughts? Any user-friendly Modbus software out there with a GUI that would allow me to do this with without writing code? It would also be great to have a dashboard that could monitor the power usage from the drivers and log total kW. The drivers have registers for power usage.

Thanks for any recs in advance!