RE: Accumulator Block
Loyd, I don't believe you have to worry about 2 resets around 6:00 AM since M01 will not reset until midnight of the following day. Ray Rick Rys [EMAIL PROTECTED]@lists.TheCassandraProject.org on 03/18/2001 10:10:09 AM Please respond to Foxboro DCS Mail List [EMAIL PROTECTED] Sent by: [EMAIL PROTECTED] To: Foxboro DCS Mail List [EMAIL PROTECTED] cc: Subject: RE: Accumulator Block Loyd, One item to be aware of is: TIM in the CALC block gets the time from the CP operating system (VRTX). As the CP (operating system) is a slave timekeeper that is updated about every 10 minutes it is possible to skip a particular second if time is adjusted forward or if the time were set back, to pass through the same seconds from midnight twice within a few seconds. This would rarely happen as there are 600 seconds in 10 minutes and it would depend on the CP clock drift relative to the Master timekeeper clock drift and unknown details of how the time is actually updated. Some engineers have had trouble with this i.e. when CALC blocks looked for a particular point in time. It's not clear how much a CP clock can drift in 10 minutes, but unlike your PC motherboard the CP must keep time with the relatively poor clock of the Intel CPU as it has no battery backed real time clock. Ray Chouinard gives a pretty good example CALC. If the clock update were a few seconds backwards it would appear possible to get 2 resets within a few seconds. Presumably this is tolerable. Also upon a power-off CP reboot the CP time is unlikely to be correct initially (I think it comes up Jan 1, 1986) until the master timekeeper sets the time - a few minutes later. CALC blocks using TIM will likely undergo an abrupt change during this first time adjustment. This may present problems if you have one master accum block reset function used for multiple CP's. Rick Rys R2Controls --- This list is neither sponsored nor endorsed by the Foxboro Company. All postings from this list are the work of list subscribers and no warranty is made or implied as to the accuracy of any information disseminated through this medium. By subscribing to this list you agree to hold the list sponsor(s) blameless for any and all mishaps which might occur due to your application of information received from this mailing list. To be removed from this list, send mail to [EMAIL PROTECTED] with unsubscribe foxboro in the Subject. Or, send any mail to [EMAIL PROTECTED] --- This list is neither sponsored nor endorsed by the Foxboro Company. All postings from this list are the work of list subscribers and no warranty is made or implied as to the accuracy of any information disseminated through this medium. By subscribing to this list you agree to hold the list sponsor(s) blameless for any and all mishaps which might occur due to your application of information received from this mailing list. To be removed from this list, send mail to [EMAIL PROTECTED] with unsubscribe foxboro in the Subject. Or, send any mail to [EMAIL PROTECTED]
AW: Accumulator Block
Hi, suggest using the TIM command which returns the number od seconds since Midnight date Maybe the station block variables CPLBUG_STA:STATION.HOUR and CPLBUG_STA:STATION.MINUTE are of help. Link them to a CALC block and compare if HOUR is 6 and MINUTE is 0. In case this is TRUE generate a 2 Seconds Pulse with OSP and link that to the RESET input of the ACCUM. I think then the time sync problems mentioned by Rick Rys (which are true) should not affect this application. best regards - Marcel Sieling Systems Technologies FOXBORO Deutschland GmbH Heerdter Lohweg 53 - 55 40549 Duesseldorf Tel.:+49 (0)211 5966-171 Fax: +49 (0)211 5966-104 Mobile: +49 (0)172 2673077 E-Mail: [EMAIL PROTECTED] http://www.foxboro-deutschland.de Private Home: http://www.powerslider.de -Ursprüngliche Nachricht- Von: Heath, Graham [SMTP:[EMAIL PROTECTED]] Gesendet am: Freitag, 16. März 2001 09:15 An: 'Foxboro DCS Mail List' Betreff: RE: Accumulator Block suggest using the TIM command which returns the number od seconds since Midnight date I say RTFM. regds -Original Message- From: Loyd Greer [mailto:[EMAIL PROTECTED]] Sent: 15 March 2001 1:31 To: Foxboro DCS Mail List Subject: Accumulator Block Hi to the list. I would like to clear (reset) an accumulator block at 0600 every day with the system clock or TOD. If this can be done, I would appreciate any suggestions on how to do it. Thanks in advance Also thanks to Joe Gale for help on a Weather Station Display. Loyd Greer Great Lakes Chem. --- This list is neither sponsored nor endorsed by the Foxboro Company. All postings from this list are the work of list subscribers and no warranty is made or implied as to the accuracy of any information disseminated through this medium. By subscribing to this list you agree to hold the list sponsor(s) blameless for any and all mishaps which might occur due to your application of information received from this mailing list. To be removed from this list, send mail to [EMAIL PROTECTED] with unsubscribe foxboro in the Subject. Or, send any mail to [EMAIL PROTECTED] --- This list is neither sponsored nor endorsed by the Foxboro Company. All postings from this list are the work of list subscribers and no warranty is made or implied as to the accuracy of any information disseminated through this medium. By subscribing to this list you agree to hold the list sponsor(s) blameless for any and all mishaps which might occur due to your application of information received from this mailing list. To be removed from this list, send mail to [EMAIL PROTECTED] with unsubscribe foxboro in the Subject. Or, send any mail to [EMAIL PROTECTED] --- This list is neither sponsored nor endorsed by the Foxboro Company. All postings from this list are the work of list subscribers and no warranty is made or implied as to the accuracy of any information disseminated through this medium. By subscribing to this list you agree to hold the list sponsor(s) blameless for any and all mishaps which might occur due to your application of information received from this mailing list. To be removed from this list, send mail to [EMAIL PROTECTED] with unsubscribe foxboro in the Subject. Or, send any mail to [EMAIL PROTECTED]
RE: Accumulator Block
Loyd, One item to be aware of is: TIM in the CALC block gets the time from the CP operating system (VRTX). As the CP (operating system) is a slave timekeeper that is updated about every 10 minutes it is possible to skip a particular second if time is adjusted forward or if the time were set back, to pass through the same seconds from midnight twice within a few seconds. This would rarely happen as there are 600 seconds in 10 minutes and it would depend on the CP clock drift relative to the Master timekeeper clock drift and unknown details of how the time is actually updated. Some engineers have had trouble with this i.e. when CALC blocks looked for a particular point in time. It's not clear how much a CP clock can drift in 10 minutes, but unlike your PC motherboard the CP must keep time with the relatively poor clock of the Intel CPU as it has no battery backed real time clock. Ray Chouinard gives a pretty good example CALC. If the clock update were a few seconds backwards it would appear possible to get 2 resets within a few seconds. Presumably this is tolerable. Also upon a power-off CP reboot the CP time is unlikely to be correct initially (I think it comes up Jan 1, 1986) until the master timekeeper sets the time - a few minutes later. CALC blocks using TIM will likely undergo an abrupt change during this first time adjustment. This may present problems if you have one master accum block reset function used for multiple CP's. Rick Rys R2Controls --- This list is neither sponsored nor endorsed by the Foxboro Company. All postings from this list are the work of list subscribers and no warranty is made or implied as to the accuracy of any information disseminated through this medium. By subscribing to this list you agree to hold the list sponsor(s) blameless for any and all mishaps which might occur due to your application of information received from this mailing list. To be removed from this list, send mail to [EMAIL PROTECTED] with unsubscribe foxboro in the Subject. Or, send any mail to [EMAIL PROTECTED]
Re: Accumulator Block
Thanks Ray, ... The calc block steps worked great! Loyd - Original Message - From: [EMAIL PROTECTED] To: Foxboro DCS Mail List [EMAIL PROTECTED] Sent: Friday, March 16, 2001 7:01 AM Subject: Re: Accumulator Block Loyd, enter the following steps in a Calc block: TIM gets seconds since midnight SUB RI01 set RI01 = to seconds from midnight to 0600 = 21600 SSP M01 sets M01 = 1 at 6:00 AM CLR M01 clears M01 after midnight IN M01 OSP 1 set one shot time = to Accumulator block period time OUT BO01 connect BO01 to the CLEAR parameter of the ACCUM block. END Ray Chouinard Mead Corp Loyd Greer [EMAIL PROTECTED]@lists.TheCassandraProject.org on 03/14/2001 08:31:06 PM Please respond to Foxboro DCS Mail List [EMAIL PROTECTED] Sent by: [EMAIL PROTECTED] To: Foxboro DCS Mail List [EMAIL PROTECTED] cc: Subject: Accumulator Block Hi to the list. I would like to clear (reset) an accumulator block at 0600 every day with the system clock or TOD. If this can be done, I would appreciate any suggestions on how to do it. Thanks in advance Also thanks to Joe Gale for help on a Weather Station Display. Loyd Greer Great Lakes Chem. --- This list is neither sponsored nor endorsed by the Foxboro Company. All postings from this list are the work of list subscribers and no warranty is made or implied as to the accuracy of any information disseminated through this medium. By subscribing to this list you agree to hold the list sponsor(s) blameless for any and all mishaps which might occur due to your application of information received from this mailing list. To be removed from this list, send mail to [EMAIL PROTECTED] with unsubscribe foxboro in the Subject. Or, send any mail to [EMAIL PROTECTED] --- This list is neither sponsored nor endorsed by the Foxboro Company. All postings from this list are the work of list subscribers and no warranty is made or implied as to the accuracy of any information disseminated through this medium. By subscribing to this list you agree to hold the list sponsor(s) blameless for any and all mishaps which might occur due to your application of information received from this mailing list. To be removed from this list, send mail to [EMAIL PROTECTED] with unsubscribe foxboro in the Subject. Or, send any mail to [EMAIL PROTECTED] --- This list is neither sponsored nor endorsed by the Foxboro Company. All postings from this list are the work of list subscribers and no warranty is made or implied as to the accuracy of any information disseminated through this medium. By subscribing to this list you agree to hold the list sponsor(s) blameless for any and all mishaps which might occur due to your application of information received from this mailing list. To be removed from this list, send mail to [EMAIL PROTECTED] with unsubscribe foxboro in the Subject. Or, send any mail to [EMAIL PROTECTED]
RE: Accumulator Block
suggest using the TIM command which returns the number od seconds since Midnight date I say RTFM. regds -Original Message- From: Loyd Greer [mailto:[EMAIL PROTECTED]] Sent: 15 March 2001 1:31 To: Foxboro DCS Mail List Subject: Accumulator Block Hi to the list. I would like to clear (reset) an accumulator block at 0600 every day with the system clock or TOD. If this can be done, I would appreciate any suggestions on how to do it. Thanks in advance Also thanks to Joe Gale for help on a Weather Station Display. Loyd Greer Great Lakes Chem. --- This list is neither sponsored nor endorsed by the Foxboro Company. All postings from this list are the work of list subscribers and no warranty is made or implied as to the accuracy of any information disseminated through this medium. By subscribing to this list you agree to hold the list sponsor(s) blameless for any and all mishaps which might occur due to your application of information received from this mailing list. To be removed from this list, send mail to [EMAIL PROTECTED] with unsubscribe foxboro in the Subject. Or, send any mail to [EMAIL PROTECTED] --- This list is neither sponsored nor endorsed by the Foxboro Company. All postings from this list are the work of list subscribers and no warranty is made or implied as to the accuracy of any information disseminated through this medium. By subscribing to this list you agree to hold the list sponsor(s) blameless for any and all mishaps which might occur due to your application of information received from this mailing list. To be removed from this list, send mail to [EMAIL PROTECTED] with unsubscribe foxboro in the Subject. Or, send any mail to [EMAIL PROTECTED]
Re: Accumulator Block
Loyd, enter the following steps in a Calc block: TIM gets seconds since midnight SUB RI01 set RI01 = to seconds from midnight to 0600 = 21600 SSP M01 sets M01 = 1 at 6:00 AM CLR M01 clears M01 after midnight IN M01 OSP 1 set one shot time = to Accumulator block period time OUT BO01 connect BO01 to the CLEAR parameter of the ACCUM block. END Ray Chouinard Mead Corp Loyd Greer [EMAIL PROTECTED]@lists.TheCassandraProject.org on 03/14/2001 08:31:06 PM Please respond to Foxboro DCS Mail List [EMAIL PROTECTED] Sent by: [EMAIL PROTECTED] To: Foxboro DCS Mail List [EMAIL PROTECTED] cc: Subject: Accumulator Block Hi to the list. I would like to clear (reset) an accumulator block at 0600 every day with the system clock or TOD. If this can be done, I would appreciate any suggestions on how to do it. Thanks in advance Also thanks to Joe Gale for help on a Weather Station Display. Loyd Greer Great Lakes Chem. --- This list is neither sponsored nor endorsed by the Foxboro Company. All postings from this list are the work of list subscribers and no warranty is made or implied as to the accuracy of any information disseminated through this medium. By subscribing to this list you agree to hold the list sponsor(s) blameless for any and all mishaps which might occur due to your application of information received from this mailing list. To be removed from this list, send mail to [EMAIL PROTECTED] with unsubscribe foxboro in the Subject. Or, send any mail to [EMAIL PROTECTED] --- This list is neither sponsored nor endorsed by the Foxboro Company. All postings from this list are the work of list subscribers and no warranty is made or implied as to the accuracy of any information disseminated through this medium. By subscribing to this list you agree to hold the list sponsor(s) blameless for any and all mishaps which might occur due to your application of information received from this mailing list. To be removed from this list, send mail to [EMAIL PROTECTED] with unsubscribe foxboro in the Subject. Or, send any mail to [EMAIL PROTECTED]
Accumulator Block
Hi to the list. I would like to clear (reset) an accumulator block at 0600 every day with the system clock or TOD. If this can be done, I would appreciate any suggestions on how to do it. Thanks in advance Also thanks to Joe Gale for help on a Weather Station Display. Loyd Greer Great Lakes Chem. --- This list is neither sponsored nor endorsed by the Foxboro Company. All postings from this list are the work of list subscribers and no warranty is made or implied as to the accuracy of any information disseminated through this medium. By subscribing to this list you agree to hold the list sponsor(s) blameless for any and all mishaps which might occur due to your application of information received from this mailing list. To be removed from this list, send mail to [EMAIL PROTECTED] with unsubscribe foxboro in the Subject. Or, send any mail to [EMAIL PROTECTED]
