Terry, You are certainly correct and that is exactly how I setup the FBM ECB ..... That takes some planing, but fortunately 99.9% of what we do only requires a 1 second scan rate so we match up very well. Thanks for bring that up as it is very important when you are optimizing a system. Thanks Troy Troy L. Brazell Duke Energy Field Services Sr. Process Control Analyst ISA CCST Phone (405) 263 4688 ext. 30 Cell (806) 898 4340 Okarche Plant Route 3 Box 95 Okarche, OK. 73762 ***************************** MS Windoze the cure for Insomnia ***************************** "Doucet, Terrence" <tdoucet@gcmconsu To ltants.com> <foxboro@xxxxxxxxxxxxx> Sent by: cc foxboro-bounce@fr eelists.org Subject Re: [foxboro] CP60 and FBM legacy 10/21/2005 09:43 AM Please respond to foxboro@freelists .org Troy, People should use the CP60 loading spreadsheet on the EDOC CD to perform their "what if" analysis. I suspect that this spreadsheet will show Jaime's CP60 fieldbus - overloaded. Although this thread started out as a loading question that has been answered by Alex, you now bring up a side issue that can affect systems. The best performance comes when FBM's (ECB's) run at the same scan rate = as the blocks. For example - FBM04 (mA) at 1.0 sec to AIN at 1.0 sec to = PID at 1.0 sec to AOUT at 1.0 sec back to FBM04 (could be different l'bug) with = ECB at 1 sec. You can phase the blocks if the basic processing cycle = (BPC)is 0.5 seconds and as long as you set the PRI correctly, all is OK. If you run your ECB's at 0.5 seconds in the above example, your 1 s AIN = will ignore half the mA input changes. On fast changing signals, this might get you in trouble. If the signal is not fast changing, then you could = be OK. You can run all at 0.5 sec but you need to carefully check loading. In any case, you never want to overload your CP. Regards, Terry -----Message d'origine----- De=A0: foxboro-bounce@xxxxxxxxxxxxx = [mailto:foxboro-bounce@xxxxxxxxxxxxx] De la part de Troy L Brazell Envoy=E9=A0: October 21, 2005 9:32 AM =C0=A0: foxboro@xxxxxxxxxxxxx Objet=A0: Re: [foxboro] CP60 and FBM legacy Question ......... The CP60s should run at .5 BPC ..... correct? The = only time that I have setup CPs at anything other than a .5 BPC is when used = in Expander Compressor controls. In this case I set the BPC at .1. Then the period on the blocks in this CP should have a period based on = the required process speed. We typically use 1 second for most control applications, temperatures we run at 30 seconds or greater if used for indication only. We have upgraded numerous CP40s to CP60s and have always seen a = significant drop in the processor loading. Troy L. Brazell Duke Energy Field Services Sr. Process Control Analyst ISA CCST Phone (405) 263 4688 ext. 30 Cell (806) 898 4340 Okarche Plant Route 3 Box 95 Okarche, OK. 73762 ***************************** MS Windoze the cure for Insomnia ***************************** = =20 joseph wu = =20 <josewusan@yahoo. = =20 com> = To=20 Sent by: foxboro@xxxxxxxxxxxxx = =20 foxboro-bounce@fr = cc=20 eelists.org = =20 = Subject=20 Re: [foxboro] CP60 and FBM legacy = =20 10/21/2005 08:07 = =20 AM = =20 = =20 = =20 Please respond to = =20 foxboro@freelists = =20 .org = =20 = =20 = =20 Running at 0.5 sec only allow one phase (0). CP60 can hold a lot more blocks than the older version. It does not mean you can run all the = blocks in the CP in the same phase. There is a running limit (Don't recall exactly but is about the same as older version CP). Try running other blocks in a slower scan rate. You must have a very special application = to run all blocks in 0.5 sec. Picure it as trying to pick up as many fish in a barrel witrh your bare hands. Even though the barrel get bigger, it does not mean you can pick = up more fish with the same two hands. Good luck! "Jaime Claramunt R. (Inforsa)" <jclaramunt@xxxxxxxxxxxxxxx> wrote: Hey List... We recently upgraded one of our 10 CP40A-FT to CP60FT. (well, with all = net changes required... V7.x, FO switches, etc) We found a prob here... CP60 new loads are very high... control loads... running at 0.5s , it's reaching 112% and 44% (phase 0,1). Worse than our old CP40... We used one pair of DCM to interfase new CP60 and existent legacy = fieldbus (3 remote racks, pair of PIO each) We are working with our local reps. but not too much clues yet... Does anybody has some hints ?? Thx. Regards, Jaime Claramunt INFORSA Paper Mill CHILE _______________________________________________________________________ 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=3Djoin to unsubscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=3Dleave Cell Phone: 281-467-1206 --------------------------------- Yahoo! FareChase - Search multiple travel sites in one click. _______________________________________________________________________ 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. 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