There are a lot of things that can be done to reduce or eliminate the overruns. You can phase the system to run blocks on a schedule to reduce the load on the CP. All blocks don't have to run on every cycle. By phasing you can get the timer to run in the correct time base. Chuck Leddon Triconex _______________________________________________________________________ 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