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Using a 12/24RC 0BA5 with high speed inputs 4.5Khz

Created by: javi2001 at: 8/27/2008 7:39 PM (12 Replies)

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8/27/2008 7:39 PM	Rate (0)
javi2001 Posts: 5 Rating: (0)	Hi there, I'm new working with Logo's and I got a 12/24RC 0BA5 to test how it works wiht high speed inputs. I need it to work with 4.5Khz and I was thinking to use some kind of frequency divider, maybe TTL, I don't know jet BUT... According to manual it can work up to 2Khz but I did a test circuit to show on display the actual input frequency andI notice it shows frequencys over 2Khz, even 4.5Khz was show on display so I wonder.... There was a modification on the maximun input frequency for the 0BA5 units not shown on manuals??? Maybe it can work with higher frequencys but this info is not show on manuals??? Any comments will be appreciated. Thanks.
javi2001 Posts: 5 Rating: (0)	Last edited by: CS Moderator at: 8/28/2008 12:04 AM new subject after splitting
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8/27/2008 8:45 PM	Rate (0)
Betel Platinum Member Joined: 1/5/2007 Last visit: 4/7/2023 Posts: 1690 Rating: (580)	Hi javi2001, please, let us know your LOGO!-program witch you used to measure the input frequency... I only kmow that the new LOGO! series 0BA6 have inputsup to5 kHz! At the other side the value that siemens say us into the handbook (2kHz for the 0BA5), is a value witch the LOGO! can handle in all cases (that means: with the lowest possible cycle frequency what can be happen!). Best regards Betel
	==> Meine TAG-Listen: "deut." ==> "Sammlung von Hinweisen und Schaltungen" ==> "PD-3-Punkt-Schritt-Regelung (z.B. für Mischer)" ==> "Zeiterfassung, ASTRO-Uhr,..." ==> "Meine EXCEL-Tools" + "Tool zur Linearisierung" ==> "Komplexes Rechnen mit der LOGO"
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8/28/2008 1:12 AM	Rate (0)
javi2001 Posts: 5 Rating: (0)	Hi, first at all, thanks for your fast answer. I did use the attached program to make my test. This program shows on screen the frequency at I5 if over 100Hz. Using a square wave 10 Vp-p I got steady readingsat displayabout 4500 Hz What's your oppinion??? can I trust this readings??? Attachment FrequecyTest.zip (727 Downloads)
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8/28/2008 12:22 PM	Rate (0)
Fux Posts: 661 Rating: (123)	Hi, i can imagine that Siemens gives a guarantee, that you can measure a frequency of max. 2kHz without loosing pulses (0BA5). Maybe it´s possible that logo can count faster, but maybe in that case pulses get lost. So i would say you can NOT trust what is displayed. And i can also imagine that it variates from module to module. Only up to 2 kHz it´s accurate.
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8/29/2008 6:57 PM	Rate (0)
rosa Posts: 191 Rating: (58)	Hi!! remember that even you can see 4.5K hz you cannot take an action this fast.. if you just want to dysplay an aproximate freq could be fine, but you depend on your programm cycle for taking action.. ¿¿ could you explain your application ?? ROSA
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8/29/2008 9:41 PM	Rate (0)
Betel Platinum Member Joined: 1/5/2007 Last visit: 4/7/2023 Posts: 1690 Rating: (580)	Hi, ROSA is right - and the new LOGO! series 0BA6 has faster high speed inputs (up to 5 kHz), but no new function to work with this inputs (or the counted values) and no new function to analyze this input frequencies !! ?... -->Because this,in my oppinion it gives only some cases to use the faster high speed inputs of the 0BA6. .... Best regards Betel
	==> Meine TAG-Listen: "deut." ==> "Sammlung von Hinweisen und Schaltungen" ==> "PD-3-Punkt-Schritt-Regelung (z.B. für Mischer)" ==> "Zeiterfassung, ASTRO-Uhr,..." ==> "Meine EXCEL-Tools" + "Tool zur Linearisierung" ==> "Komplexes Rechnen mit der LOGO"
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9/4/2008 10:22 PM	Rate (0)
javi2001 Posts: 5 Rating: (0)	Hi again guys, well the idea is use the Logo to measure the speed of a diesel engine and if speed reach a setpoint take action. The normal speed is 1800 RPM, at this speed the magnetic sensor provides 4.260Hz whenenine reach 1950 RPM (4.615Hz) it should be turned off. The engine can stand up to 2.100 RPM so, there is no need to take action as soon as set point is reach, even a 1 second delay will be ok. Can you recomend a frequency divider to reduce frequency let's say by 4 so Logo just receive about 1 Khz at input??? Thanks all for your comments...
javi2001 Posts: 5 Rating: (0)
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9/4/2008 10:37 PM

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Betel

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Joined: 1/5/2007

Last visit: 4/7/2023

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Hi javi2001,

that is possible - look at my answer (and the attachment there) under the link:

"Water Flow sensor - Counting Pulses HELP!"

Best regards
Betel

==> Meine TAG-Listen: "deut."
==> "Sammlung von Hinweisen und Schaltungen"
==> "PD-3-Punkt-Schritt-Regelung (z.B. für Mischer)"
==> "Zeiterfassung, ASTRO-Uhr,..."
==> "Meine EXCEL-Tools" + "Tool zur Linearisierung"
==> "Komplexes Rechnen mit der LOGO"

9/5/2008 12:26 AM	Rate (0)
rosa Posts: 191 Rating: (58)	Hi!! you can also use a frequency to analog converter and use the 0-10V input of LOGO!... there are several converters in the market as an example Weidmuller 8581180000 could work http://catalog.weidmueller.com/procat/Product.jsp;jsessionid=0C0D1B52ABA4C30293CB64D255E4EDC9?productId=(%5bprod3312943132240%5d)&page=Product ROSA
rosa Posts: 191 Rating: (58)
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9/5/2008 12:50 AM	Rate (0)
javi2001 Posts: 5 Rating: (0)	Hey nice idea!!! I'll check also.. Here in venezuela we don't have so mani options but we can get parts from big brands like Siemens, Telemecanique, ABB, etc etc Do you know any option with some of this brands???
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Using a 12/24RC 0BA5 with high speed inputs 4.5Khz

Created by: javi2001 at: 8/27/2008 7:39 PM (12 Replies)

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Created by: javi2001 at: 8/27/2008 7:39 PM (12 Replies)

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Last edited by: CS Moderator at: 8/28/2008 12:04 AM

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