The 7I37 Inputs and outputs are a bit more flexible
(they can both sink and source since they are all isolated)
This means more wiring however since there is no common
The 7I84 has only sourcing outputs and sinking inputs
With 7i37TA i have tried inputs for home-limit switches and when the switches triggered became TRUE in hal the inverted input (in_not)
This hal config worked with 7i80hd + 7i37TA
net estop-ext <= hm2_7i80.0.gpio.024.in_not
net home-x <= hm2_7i80.0.gpio.026.in_not
net both-x <= hm2_7i80.0.gpio.029.in_not
I have common ground for outputs to all peripherals and driving voltage is 28-29V (<1A current example electrovalves/mini relays) so sourcing outputs is that i want plus double I/O with 7i84..
Which are the names to access from hal the pins of 7i84 connected to 7i80hd ?
hm2_7i80.0.7i84.0.0.output-00
hm2_7i80.0.7i84.0.0.output-00-invert
hm2_7i80.0.7i84.0.0.input-00
hm2_7i80.0.7i84.0.0.input-00-not
Another question..
Why mesa fpga cards have pullup resistors ?
If i have breakout board with relays that the inputs are active high
when linuxcnc is closed mesa fpga outputs +5v to output pins
and it enables breakout board relays which is unwanted behavior.
Why not have pulldown resistors ?
For inputs this is not a problem because i can read gpio.000.in_not
also for outputs can do gpio.010.invert_output true
but this is when linuxcnc runs when fpga card is powered without
connected with linuxcnc what can i do ?
