Based on 25 years of professional experience in various businesses around the globe, I can say that many industry verticals have a pretty good state of safety culture as it relates to the health and safety of their employees. This is especially true for companies involved in high-risk businesses such as oil and gas, (nuclear) energy, manufacturing, chemicals, food processing, and so on. In such industries, it is pretty clear that there is a risk that something may blow up, hurt, or even kill people.
However, it seems that the next big driver for them is business alone, and they are not as focused on information or IT security when it comes to the logic side of security like bits and bytes, document handling of confidential information, and similar subjects. This is in stark contrast to their keen attention to physical safety and security issues.
It would seem intuitive that any organization with a commitment to safety by counting (and incentivizing) the hours (days, weeks, months, …) of safety-incident-free time should also be easy to convince that taking a similar approach to information security would be a good thing. But it is not that easy. Operations in these businesses are very physical, so it is not really in the mind-set of a rig guy or gal, a welder, a component mixer, machine operator, or similar, that another devastating incident (attack) could happen from “within” the system(s), by a human adversary committed to do harm in the interest of their nation state or paying agent. All those systems in the above mentioned industries that are working at the process level (sensors/actuators, process control, SCADA (supervisory control and data acquisition) are designed for efficient and effective, good performing, and reliable operation, but they were not really designed and built to resist logic attacks from a human smart guy who can outsmart almost every defense.
In industrial networks, spanning the areas of instrumentation, control bus, operations, business, or enterprise, the often cited Purdue reference model that provides for several “levels” or “zones” of abstraction and segregation can be used. A really good introduction can be found in the Secure Data Transfer Guidance for Industrial Control and SCADA Systems.
The main security points to address are: