We don't typically do PHAs on the control system in and of itself, but rather include it as a part of the overall process PHA. Control system failures are taken into account if they are possible causes of hazards. Corey Clingo Sr. Engineer BASF Corporation ___________________________________________________________________ This list is neither sponsored nor endorsed by The Foxboro Company. Use the information obtained here at your own risk. For disclaimer, see http://www.thecassandraproject.org/disclaimer.html#maillist list info: http://www.freelists.org/list/foxboro subscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=join unsubscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=leave