Alex, Unfortunately it's the Legacy Historian. Too slow? How do I store the absolute value of ERROR? I can use ABS in a MATH or CALC Block, totalise this in ACCUM and then coll= ect in Historian or PI. I was hoping I could configure a collection point for each ERROR parameter,= then use a reduction group to process these as totalisations based on the = absolute value of the collection point. Thanks Greg -----Original Message----- From: Johnson, Alex (Foxboro) [mailto:ajohnson@xxxxxxxxxxx] Sent: Thursday, 4 March 2004 11:04 To: foxboro@xxxxxxxxxxxxx Subject: Re: [foxboro] ABS Reduction The ERROR parameter is connectable for read and you can add it to your historian just as with any other point. You can configure the reduction in the historian. The issue will be CPU loading on the Historian platform if you use "real" reduction groups as opposed to letting it be calculated on the fly. Which Historian are you using? The I/A Series Historian stores reduction groups in Informix and will be too slow; AIM*Historian on a modern platform should be able to handle things well. Does this help? Alex Johnson Invensys Systems, Inc. 10707 Haddington Houston, TX 77043 713.722.2859 (office) 713.722.2700 (switchboard) 713.932.0222 (fax) ajohnson@xxxxxxxxxxx For the latest information on ArchestrA, go to www.invensys.com/Archestra.html. -----Original Message----- From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On Behalf Of Greg.Howden@xxxxxxxxxxxx Sent: Wednesday, March 03, 2004 5:58 PM To: foxboro@xxxxxxxxxxxxx Subject: Re: [foxboro] ABS Reduction No comments from anyone? -----Original Message----- From: Greg Howden=3D20 Sent: Friday, 27 February 2004 12:41 To: foxboro@xxxxxxxxxxxxx Subject: [foxboro] ABS Reduction For all of our PID controllers, I would like store 10 minute totalisations = =3D =3D3D of the absolute ERROR parameter. Is there any way of doing this using a red= =3D =3D3D uction group, or am I restricted to using a MATH or CALC block for each con= =3D =3D3D troller. Thanks Greg ---------------------------------------------------------------------------= =3D =3D3D ----------------------------------------- This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the originator of the message. This footer also confirms that this email message has been scanned for the presence of computer viruses. 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