Simple IO wiring not working (I know I am doing something wrong)

That diagram is wrong, it should be
power gnd to Mesa GND
power + through switch to Mesa input.

Well that is going to be difficult given how the Proprietary Bob is designed from what I can gather..

I was really hoping I didn't have to tear out the IO BoB and rebuild the whole thing

jhandel wrote: Well that is going to be difficult given how the Proprietary Bob is designed from what I can gather..

I was really hoping I didn't have to tear out the IO BoB and rebuild the whole thing

The 7i76 inmput needs to see 12v from field power connector for it to switch to true.
You dont have to tear it out, just put a relay to trigger off the bob output then pass the 12v of field power through the relay to the input of the 7i76.

I had the exact same scenario last year on a retrofit.worked like a charm.

Probably better to remove the bob and interface directly with the 7i76. Depending on your prox switches. PNP or NPN, one connects directly and the other you need some pullup resistors.

I'll have to dig through my transistor stash... I can flip the value via a transistor.. the trick will be making a package that is easy to make 20 some odd times and doesn't turn the box into a rats nest..

jhandel wrote: I'll have to dig through my transistor stash... I can flip the value via a transistor.. the trick will be making a package that is easy to make 20 some odd times and doesn't turn the box into a rats nest..

Please see this: forum.linuxcnc.org/38-general-linuxcnc-q...oard?start=10#177142

Before you do anything hw:
1. If you use a switch that has 12v on one side and gnd on the other connected to the 7i76 input.. Can you see that toggling in hal? Don't move on with hw until you solved that.
2. Connect your bob to the same mesa input and measure with a real meter. Does it toggle. Yes = Do you see hal toggling too, problem solved

NO = 3. Is voltage not in full swing - try with resistor ca 1k if it gets better
A ) resistor from 12v to signal B ) signal to gnd

4. Eventually you have to lock for additional supply of bob.
Mike

tommylight pull up resistors it is... It flips the logic so I'll need to use "not" input pins.. But tested with a 1kohm resistor and pull up resistors work consistantly..

Going to basically make a small breadboard like this (see attached image)..

So now to work out where it goes in the box.

If you are ordering resistors, get them at 2.2K or 4.7K and 1/4W.
1K will do just fine for 12V, but in case you need to raise that to 24, you would need bigger resistors at 0.5W

lucky for me all of my inputs are 12v because they are coming off of that BoB.. I did try 2.2k and 4.7 and they didn't work... but 1k worked consistently... So at least for this machine that "should" work.. .

jhandel wrote: .. I did try 2.2k and 4.7 and they didn't work... but 1k worked consistently... .. .

Nice to know that, thank you.