My friend and mentor Billy Rios will be the instructor for the upcoming SANS Institute ICS/SCADA Security Essentials in Atlanta, September 28 thru October 2. Billy is not only an expert on this subject, but is highly engaging and thought provoking. His instructional delivery method coveys information that can be easily understood and is comprehensive.
The course is not specifically BAS focused but it does cover topics that are important to our type of integration. Also, attending this course will earn you 30 CPEs.
There is link below for information on this course.