In addition to these considerations, if the system uses FoxView, this display program may hang up when the time is set forward. Also, if any Control data base actions Reference time specifically (such as resetting accumulators at a specific time) these may also be impacted. Reference in the gentlemen's not to an APC PC may imply Advanced Process Controls, and it is now uncommon to see advanced controls look at process conditions over the course of time periods like hours or a day. It may be that these should be switched off or set to manual before time is changed, and restored to operation aftward. This, of course, is better determined someone who knows the application. William C Ricker FeedForward, Inc. _______________________________________________________________________ This mailing list is neither sponsored nor endorsed by Invensys Process Systems (formerly The Foxboro Company). Use the info you obtain here at your own risks. Read http://www.thecassandraproject.org/disclaimer.html foxboro mailing list: //www.freelists.org/list/foxboro to subscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=join to unsubscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=leave