My 7i76e Connection Sheet

Thanks, If you had published this a week or so earlier, you would have saved me the cost of the power supply
The advantage of using 2 power supplies is that this does not apply.
"When the on card regulator is used, the maximum power available from the encoder, serial, and 26 pin expansion connectors is 2A total."

The only thing that I've noted is missing is connecting a THCAD for plasma
TB3.01 -> THCAD.P1.1 +5 V
TB3.07 -> THCAD.P1.2 FOUT+
TB3.08 -> THCAD.P1.3 FOUT-
TB3.06 -> THCAD.P1.6 -5 V

Of course, there are other pins available to obtain 5 volt power for the THCAD

Hallo rodw,

thanks for the Information.
The Pins you mentioned are metioned in my config for other purpose.

Norbert

Hi
I'm new to the forum and also new with Linuxcnc. But I managed to install a MESA 7i76e in Linuxcnc 2.7. My question now concerns the following question: Can I connect directly the output signal of a 24V 3-wire NPN Omron EE-SX670A (NPN) to 5V logic (Index hookup of the Encoder part on TB 3). And can I also use the output signal of a second NPN Omron EE-SX670A with the encoder connector A? The signal of a perforated disc with 12 holes is read off. - Thank you very much for your help!

This is a very helpful guide for getting started -- thank you for it! Can anyone explain how I would connect/configure normally open NPN prox sensors correctly? I realize they are not the optimal choice, but they are what I'm currently stuck with. I'm powering them at 24v, directly from the power suppl. They push +24v to the input pins when not activated then when activated they flip to ground. Is this OK?

Thanks again.

Typically NPN proximity switches would need a relatively stiff pullup resistor (say 2K 1/2W) to 24V
to work with the 7I76E's sinking inputs (because a bare NPN output can only sink current to ground)

If they output +24V into the 7I76E inputs wihout added components,
it likely means they are either not NPN sensors, or they have built in
pullup resistors or push-pull outputs.

Thanks for the reply. I have 8 of the sensors in the pic attached (min/max on every joint of a gantry router). They are apparently acting as they are designed, as confirmed by some Googling and YouTube demos of the product. I have some 2k/1w resistors in the parts bin, but lacking any direct experience from others using this type with the 7i76e I'm concerned about unforeseen consequences. I'm learning as I go.

If I've just got the wrong product, I can fall on my sword and buy new PNPs -- but if there is a way to make it work with what I've got, that would be preferable. I welcome any informed opinions -- if I should not bother wasting my time with a patchwork mish-mash, don't be afraid to say so

I made the same mistake and use the pull up resistors as PCW has said and they work fine. You can see the resistors spanning between the output and +24V in this pic.

OK, my education continues. I think I'm vaguely starting to get it. I have my inputs configured like the diagram from the OP's Connection Sheet -- with one difference: my sensor is N.O., where his is N.C. Each of my 8 leads go into pins 4-12 on the 7i76e's TB6 connector.

On their way to the input pin, each signal lead gets a T-spliced connection to the +24v side of the power supply through a 2k 1w resistor -- but I'm not sure how this matters, since the sensor itself feeds +24v straight through on it's black wire when it is open. When it detects nearby metal, the +24v toggles to Ground on the black wire. The net is, if I measure voltage on the input pins via their screw heads, that voltage is always +24v while the sensor detects nothing.

Is +24v going into the TB6 input pins OK?

Attached is a photo of the sticker on my sensor. The manufacturer refers to this sticker "the manual" -- yep, that's IT. It appears to show what I believe PCW suggested in his previous post -- that the pullup is built in? The rectangle with the diagonal slash through it is spanning between the signal wire and positive, with "300mA" defined. Does that make the additional resistors unnecessary?


Finally, the difference between the diagram in the OP and my setup: since I'm normally open, the input pin sees "high" until detection, then it sees Ground. Would my configuration just need to invert the signal in linuxcnc to indicate triggering, where this OP's config would show High as a trigger?

Thanks for the patience and shared experience. I've been dabbling at this build for months, and it's so close...yet so far...

I don't think you have a pullup resistor. The "manual" shows a load (whatever you are switching). The NO and NC just says what is the state without the sensor near some metal. So a NC switch will have +24v on the output away from metal and the NC will have +24v on the output while close to metal. Hope I got that the right way round. BEst bet is to hook it up to a power supply and play with a multimeter.

I think you will find that you will get spurious activity on the output without the pull up resistor on an NPN sensor...

This video explains it very well