Can a controller act like a brain over Modbus tcp/ip? By which I mean, if I understand correctly, using Modbus and a brain, I can read inputs and set outputs. Can I do the same with a controller, even if it’s not running any programs? A dumb controller, basically.
The reason I’m asking is because I’m working on a project where at the moment all I need is simple I/O control over ethernet. But I’m betting a week’s salary that we’re actually going to need a PAC. And this will be learned when I’m already on-site in a foreign country with two days left until turn-on.