No Input Signals

I now attach my config files. I try if proximity switch works with 5V.


I get the feeling I fried the BOB with my 24V . Though it has a 12V-24V Input specification. Or this is another translation mistake by the Chinese manufacturer

I can't use the proximity switches with 5V. I tested it and they start working at 12V. When I apply 5V a) the led won't light up and b) it won't switch from 5V to 0


I probably smoked the opto isolators, because I can't measure any potential drop at my added 2,2kOhm resistances (to be precise, when I measure the voltage in parallel to the resistance, there is a 0.00V on my multimeter). This might be the reason

alfongs wrote: I can't use the proximity switches with 5V. I tested it and they start working at 12V. When I apply 5V a) the led won't light up and b) it won't switch from 5V to 0 :'

Yes, but, you should be able to power it with 24V and have it switch a 5V input pin between 5V and 0V.

This is _exactly_ how my lathe limit switches work, so I know it is possible. (although I am connecting to a Mesa card)

but how do I realize this? I only got one extra wire which I can measure to gnd

alfongs wrote: but how do I realize this? I only got one extra wire which I can measure to gnd

What voltage are the pull-up resistors connected to?

If you connect the sensor black wire to one end of a resistor and the other end of the resistor to 5V then you should see the black wire switch between 5V and 0V.

If the inputs on the BoB are varying between 0V and 24V then _something_ is funny about your pull-up arrangement.

The pull-ups are connected to +5V and directly soldered to one leg of the optocouplers (on BOB).

I'm further looking into this tomorrow to get a switch between +5v and 0 at the screw terminals.


But I'm also preparing to get a new bob in case my 24V have burned the optocouplers ...