The original problem was trying to get an ACCUM block in two different CP's to reset at the same time. In our case setting the ACCUM blocks as the first block in the compund in each CP and using the same calc block for the reset seemed to take care if it. There is about a 1 second difference now. New question, we're using a CALC block to reset the ACCUM blocks using xxCPxx_STA:STATION.HOUR and .MINUTE parameters. The reset is set to occur at 23:58, looking a values in the historian the reset will occur anywhere between 23:58:08 and 23:58:16. This is not an issue but I was curious why it takes that long to process? Thanks, Brian Long Arkansas Kraft _______________________________________________________________________ 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