The most simple solution would be to set AIN block parameter (of your = temp. measurement) FLOP=3D1 (for first order lag filter) and set the = filter time constant by adjusting the FTIME parameter of AIN block (I = believe the time value you have to set is in minutes) to a desired = value. Rocco=20 -----Original Message----- From: foxboro-bounce@xxxxxxxxxxxxx = [mailto:foxboro-bounce@xxxxxxxxxxxxx] On Behalf Of Dirk Pauwels Sent: Thursday, April 28, 2005 12:16 PM To: foxboro@xxxxxxxxxxxxx Subject: [foxboro] filter 4-20 signal Importance: Low Does any of you guys know how to "filter" a 4-20 signal? I have a temp=20 signal that varies a lot from 20=B0c to 40=B0c, we plan to use it in = automation,=20 but I need to get rid of the "peaks", so if the average temp in a = 1minute=20 time periode is approx 35=B0 but it showed peaks from 22 to 38,I need = to show=20 the operator the avgtemp of 35=B0 and use this avg temp in the auto = control.=20 I'm using a sequence now, but I'm sure there are far better sollutions. Thanks & Rgds, Dirk Pauwels - DCS coordinator Engineering dept. Lawter International BVBA An RSM Company Ketenislaan 1c - Haven 1520 B-9130 Kallo, Belgium T. +32.(0)3.570.95.97/ Mob. +32.(0)497.428.300 F. +32.(0)3.570.16.09 E mail: dirk.pauwels@xxxxxxxxxx _________________________________________________________________ =20 =20 _______________________________________________________________________ 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 =20 foxboro mailing list: http://www.freelists.org/list/foxboro to subscribe: = mailto:foxboro-request@xxxxxxxxxxxxx?subject=3Djoin to unsubscribe: = mailto:foxboro-request@xxxxxxxxxxxxx?subject=3Dleave =20 _______________________________________________________________________ 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: http://www.freelists.org/list/foxboro to subscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=join to unsubscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=leave