From Friday, April 19th (11:00 PM CDT) through Saturday, April 20th (2:00 PM CDT), 2024, ni.com will undergo system upgrades that may result in temporary service interruption.
We appreciate your patience as we improve our online experience.
I have heard there is a bug in the tcp/ip mode of the modbus object prior to Lookout 4.5.1 build 18 with the latest fixes applied. It did not connect for me until after the fixes were applied. I would recommend contacting NI support directly to see if this could be an issue.