PXI6229/SCB68

[Clint_Eastwood1000]

Can you use the 5 vdc on board supply of a SCB68 ( pin 😎 as a pull up voltage??  So pin 8 connected to a 1 meg resistor and the other end of the resistor connected to a DIO say P0.0 ( pin 52)  I would then run a connection from Pin 52 to a switch which tells me ( interlock) if a door was open or not.  If interlock is open P0.0 is at 5 vdc.  If interlock is closed P0.0 is conneted to rtn/gnd so P0.0 is 0 vdc.  I've done this w an external PS in place of the on board scb68 one and it works.  This one doesn't.  It looks like the dios are always low.

[crossrulz]

The 6229 has a built in pull down.  The minimum resistance for the pull down is 20kOhm.  So a 1MOhm pull up will do nothing.  So the alternative I would use something more like a 1kOhm pull up to override that built-in 20kOhm.

[Clint1000]

Thanks...sorry for the late reply and late Kudos..  I appreciate the help.