To build on what I said before, wireless networks are unlikely to be rock solid unless you do some honest to god design and planning ahead of time. Plan your channels, do a site survey at the facility to find out what existing wireless is in place. collaborate with IT to ensure you're sharing the wireless space.
And then they'll work fine until the IT group installs another access point somewhere and steps on what you're doing.
Industrial facilities with steel, brick, and concrete all over are big killers for wireless if you don't plan well.
There are some systems where wireless just makes things possible that you couldn't have otherwise done. I love it for mobile systems like AGVs and cranes/gantries. But you almost never get the reliability you expect if you just toss a couple routers up assuming it will be easier to do things without wires than with them.
