Set up a 100-ppr encoder with Logo

 Buenas tardes, tengo una consulta quiero configurar un encoder de 100 ppr con los 2 canales A-B y lo quiero hacer con un logo v8 (12-24vc) ya que este tiene entradas de contaje rapido (I3-I4-I5-I6).He hecho la programacion conectando esta entrada directa al bloque contador y en conteo ascendente trabaja muy bien el punto es que quiero que tambien descuente ccw al tomar los pulsos del canal B , y es ahi donde no se como hacerlo porque como les comento el conteo ascendente lo hace bien pero el descendente no lo hace en cifras reales ...si pudieran ayudarme con un esquematico de como podria  hacerlo, cabe mencionar queya hice la prueba tomando los pulsos de el canal A y por medio de otra entrada (no rapida ) activo en el bloque la direccion y ahi si hace el conteo descendente en forma normal,pero en la aplicacion que voy a usar no me sirve asi , debe ser como les mencione con los canales A-B  y hacer el contaje ascendente y descendente.

gracias de antemano.                                                   

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Split from Siemens LOGO! + Incremental Encoder.

joeldav [Google Translate]

Good afternoon, I have a question I want to set up a 100-ppr encoder with 2 channels AB and I want to do with a logo v8 (12-24vc) as this has fast counter inputs (I3-I4-I5-I6) .He Indeed programming connecting this direct input to the counter block and count up works fine point is that I want also deducts ccw to take the pulse of channel B, and that is where not know how to do because as I commented counting up what it does well, but the downward it does in real terms ... if they could help me with a schematic of how it could do, include queya I auditioned taking the pulse channel a and through another inlet (not fast) active in the address block and there if you count down normally, but in the application that will use does not serve me well, as I mentioned them should be the AB channels and make the up and down counting.

Thanks in advance.                          

Hi - welcome.

The technical  correct answer is to not use the LOGO. The LOGO is weak for this function.

You can build a circuit (German Forum has an example) but not for the 5kHz ability of the high speed counter as you mention.

You can change the direction of the counter when the LOGO detect there is movement. The LOGO can then decide if [+] or [-] direction. But this is not good enough.

Frequency is not the only enemy. For AB pulse to work, the system need to count    false -> true   and    true -> false    . If not doing this you will loose counting as soon as the direction changes.

Please reply in English to continue this conversation.
w

Thanks for the quick reply ...

I forgot to mention that the count rate I want to take is maximum 50 RPM ( LOW SPEED ) , so I thought that the fast inputs logo 8 servirian for this, because I see that the counter if you can read pulses at this rate , if I reviewed some methods but I always have trouble counting down , if you have a method that can work I appreciate it. or whether you can not definitely do this.

joeldav

Thanks for the quick reply ...

I forgot to mention that the count rate I want to take is maximum 50 RPM ( LOW SPEED ) , so I thought that the fast inputs logo 8 servirian for this, because I see that the counter if you can read pulses at this rate , if I reviewed some methods but I always have trouble counting down , if you have a method that can work I appreciate it. or whether you can not definitely do this.

 50 rpm.... but what resolution encoder? How many pulses per revolution?

50rpm with 100pulse/rev - right?
This can be made to work without needing 5kHz input speed - but I am hoping that someone from this Forum shows you where the program is that can do what you need from the LOGO.

w

50rpm with 100pulse/rev - right?
This can be made to work without needing 5kHz input speed - but I am hoping that someone from this Forum shows you where the program is that can do what you need from the LOGO.

william.

50 RPM EFFECTIVELY WITH 100 PPR I think the LOGO IF YOU CAN DO THIS WITHOUT PROBLEMS BUT IF SOMEONE IN THE FORUM HAS ALREADY DONE AND HAS BEEN SOMETHING LIKE GOOD WOULD BE EXCELLENT AND EVEN IF HELP ME WITH THIS SCHEMATIC.