--- In DynoMotion@yahoogroups.com, Tom Kerekes <tk@...> wrote:
>
> Hi Michael,
>  
> No disadvantage I can see to using the opto inputs other than there is only 8 of them.
>  
> I believe the Kanalog opto inputs wil be fast enough.  I don't know what a Knock sensor in a car is (or rather how it works).
>  
> Yes the PMDX170 can be powered by +5V and pull low a 3.3V signal.
>  
> Regards
> TK
>
> From: michaelthomasn <michaelniksch@...>
> To: DynoMotion@yahoogroups.com
> Sent: Monday, April 23, 2012 6:06 AM
> Subject: [DynoMotion] Re: Snap Amp Kflop Connectors
>
>
>  
> The opto inputs sound like a good option. Is there any disadvantage to using them over the General I/O's?
>
> On the Studer grinder retrofit I'm going to be attempting.....there is a feature that requires a "high speed input". I suspect that high speed is a relative term in the case of this 15 year old control that it currently runs on. Its akin to a knock sensor in a car, and it allows the grinder to rapid blindly to its next destination and when the "Knock" sensor is activated....it immediately slows to programmed feed rate. They call it a sensitron. Its 24v, and I figured on using an opto with the Kanalog. Are these "high speed enough"? I thought i had read elsewhere in the forum that the whole KFLOP was high speed, at least in comparison to the controls of old.
>
> In regard to the PMDX 170 using the general I/O's. Is it OK to wire the switch with 5v (since it says requires a minimum of 5v), then use the 3.3v on the pullup for the signal output?
>
> Mike
>
> --- In DynoMotion@yahoogroups.com, Tom Kerekes <tk@> wrote:
> >
> > Hi Michael,
> >  
> > 110ohm is probably the more correct value.  But 150ohms would also help dampen signal ringing a lot as compared nothing.  
> >  
> > Regarding the pull up out at the sensor.  That might work.  But a pull up to 3.3V local to KFLOP might tbe better.  Although some of the inputs Tolerate being pulled toward +5V they were really designed for 3.3V so I try to do that when possible.  You may also need a 0.1uF capacitor from the KFLOP input to ground close to KFLOP.  Otherwise there might be noise picked up in the 7 ft cable from the sensor to KFLOP.   It might work fine, but the pull up and filter cap close to KFLOP would be better.
> >  
> > Actually I forget all your requirements but if you have a SnapAmp it has (8) +12V opto inputs that could be used directly with those sensors. You would connect the + side of the Opto input to +12V then the - side of the opto to the sensor output.
> >  
> > Regarding encoder cables:  If both are shielded I would think it would be ok.
> >  
> > Regards
> > TK
> >  
> >
> > From: michaelthomasn <michaelniksch@>
> > To: DynoMotion@yahoogroups.com
> > Sent: Sunday, April 22, 2012 9:12 PM
> > Subject: [DynoMotion] Re: Snap Amp Kflop Connectors
> >
> >
> >  
> > Thanks, Tom
> >
> > The Winford 25x2 was what I was looking at.
> >
> > The us digital literature says this about the E5 encoder.....
> >
> > Maximum noise immunity is achieved when the differential receiver is terminated with a 110-ohm resistor in series with a .0047 microfarad capacitor placed across each differential pair. The capacitor simply conserves power; otherwise power consumption would increase by approximately 20mA per pair, or 60mA for 3 pairs.
> >
> > Is the disparity in their 110 ohm recommendation and your 150 ohm suggestion a trivial matter?
> >
> > I certainly trust your suggestion, I only wonder if their particular product needs something specific.
> >
> > I was not aware that the JP7 i/o's were still available on the Kflop when using the SnapAmp......cool.
> >
> > I spoke to you earlier in email about pull up resistors when using the PMDX 170's as limit switches. Would it be acceptable to place the 1k resistor on the sensor end? It would seem simple to just insert one leg of the resistor into the +5v terminal, and the other end into the signal terminal which is right next to it on the PMDX 170. I'm still not quite there on its function.....but I feel close....lol.
> >
> > Is the greater noise immunity with the differential encoders typically enough to allow the wires to be bundled with the servo power wires as I frequently see on commercial machines? It would be convenient for me to do so......but not the end of the world if I couldn't. I was checking out the wiring on the Onsrud machine at my former employers.....and they run the encoders in the same wire cable chain alongside the power wires. My encoder cables will be no longer than 7 feet.
> >
> > Thanks, Tom
> >
> > --- In DynoMotion@yahoogroups.com, Tom Kerekes <tk@> wrote:
> > >
> > > Hi Michael,
> > >  
> > > Yes you will probably want to get a 50 pin Winford BOB for SnapAmp JP7.
> > >  
> > > http://www.winford.com/products/brk2x20.php
> > >  
> > > The IO on KFLOP JP7 will also be available when using SnapAmp.
> > >  
> > > The SnapAmp differential encoder inputs do not have any termination resistance, so if your cables are long you should add ~150 ohm termination across the + to - differential inputs near SnapAmp JP7 (at the BOB).
> > >  
> > > Yes if you order a KFLOP+SnapAmp together we will include the 16 pin ribbon connection between them and the standoff hardware to mount KFLOP on top of the SnapAmp (0.5 inch standoffs under KFLOP and 1.25 inch standoffs under SnapAmp).
> > >  
> > > Regards
> > > TK
> > >
> > > From: michaelthomasn <michaelniksch@>
> > > To: DynoMotion@yahoogroups.com
> > > Sent: Sunday, April 22, 2012 12:57 PM
> > > Subject: [DynoMotion] Snap Amp Kflop Connectors
> > >
> > >
> > >  
> > > I have decided to get a Snap Amp for my DC brushed servos and some us digital differential encoders instead of using my Gecko 320x's and AMT's.
> > >
> > > I'm ordering ribbon cable and connectors, BOB, and such.
> > >
> > > JP7 would have been sufficient for me on the Kflop for my 3 axis mill.....and my intention was to use a 26 pin winford BOB from JP7.
> > >
> > > Am I correct in thinking that I will need a 16 pin ribbon to connect the snapamp to the Kflop, then a 50 pin ribbon to some sort of breakout board instead of JP7's 26 pin?
> > >
> > > If purchased together, will it come already mounted with the cable like my kflop/kanalog did?
> > >
> >
>