"Thanks for your comment Mohsin. From my understanding checking with a colleague, there is a separate 800M controller for SIL-rated applications. If one is willing to use a SIL-certified platform to run BPCS logic, this should be an option, but its important to remember that to fulfill the standards, one still needs to have separate application, which will save some spare parts spending, but project implementation tends to be much higher." - Jim Cahill