[skmetal7]

Ok so I have most of my controller put together, but I need some advice on connecting some things. I have a hall effect sensor for spindle speed that has a sinking output, so I need a pull up resistor on the input of my C10 B.O.B. BUT my limit switches (in series) and E-stop are NC as usual and so I need a pull down resistor for this input. Is there anyway to have these both play nicely on the same BOB? I'm thinking of putting the limit switches in parallel and have them NO but I can't have the E-stop NO. Could I cut a resistor off the C10? Everything else is working perfectly, though.

[john-100]

when I looked at the C10 board it had a common jumper to select 4K7 pull up or pull down resistors for all 5 inputs

if you set the jumper to pull up

to avoid mods to the board I'd try using a 470 to 100 ohm resistor to pull one of the inputs down to ground

if you used a 100 ohm resistor the switch would have to pass a current of 50mA
use a 1/2 W resistor
with the switch open the C10 input will be at about 0.1V (very close to 0V)

alternatively
with a 220 ohm resistor the current is reduced to 23mA

with a 470 ohm resistor the current is reduced to 10.6mA but the C10 input
will be at 0.455V when the switch is open

Attachment 362854


John


PS

C10 input circuit

Attachment 362860


PPS

even simpler

connect the series connected E-Stop & limit switches to GND instead of +5V
( but you probably going to need an additional connector to connect all the ground wires to the C10 ground / 0V terminal )

[skmetal7]

I used the 220 OHM resistor method and it worked well! I didn't really want to run all my limits to gnd, it would mean rewiring several wires since they wouldn't be long enough. But I'll keep that in mind next time. I just used a resistor stuck into each input pin and tied them all together with a long gnd wire.

Thanks!

[john-100]

great news that you have it working as you want
just the result we want

John