some words copied from one of Alex articles: The CP sends data between stations only when it changes by enough to be interesting. For floating point numbers, you set the delta. Integers and Booleans are sent on each change. You can set the delta configuring a parameter. For example=20 DELTO1 change delta, output 1 real no-con/no-set 1.0 percent =20 for an AIN block. Does it helps? I don't know how IALink works. Regards, Andreas _______________________________________________________________________ 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