I am not convinced air-gap is even a good idea for PLC networks. More and more these systems are developed by consultants and OEMs. Who then need to service and troubleshoot them. I work for an OEM with this problem and it plagues me all the time. "Sorry, I can not fix your issue without access and I am not flying someone down for this."
This business reality is going to get worse as time goes on. Companies would be receptive to change if people at the executive level were educated first. The carrot being more cost effective system development.
This business reality is going to get worse as time goes on. Companies would be receptive to change if people at the executive level were educated first. The carrot being more cost effective system development.