Control panel, MUX wiring help

Grab a 7i70 remove the diodes, connect to the 7i70 inputs to what used to be the Cathode side of the diode and connect all the scan lines to VField. Diagram as shown should use all 48 inputs. Then it should be a one to one button to hal pin setup.

Not sure why you would _not_ use matrix_kb, since its designed for that exact
task. Any other solution that reads all the switches would be more complex
(as you would just be re-creating matrix_kb)

The basics are:

loadrt matrix_kb config=6x8s
setp matrix_kb.0.negative-logic false
addf matrix_kb.0 servo-thread

net row0 matrix_kb.0.row-00-out some_7I77_output_a
net row1 matrix_kb.0.row-01-out some_7I77_output_b
net row2 matrix_kb.0.row-02-out some_7I77_output_c
net row3 matrix_kb.0.row-03-out some_7I77_output_d
net row4 matrix_kb.0.row-04-out some_7I77_output_e
net row5 matrix_kb.0.row-05-out some_7I77_output_f

net col0 matrix_kb.0.col-00-in some_7i77_input_a
net col1 matrix_kb.0.col-01-in some_7i77_input_b
net col2 matrix_kb.0.col-02-in some_7i77_input_c
net col3 matrix_kb.0.col-03-in some_7i77_input_d
net col4 matrix_kb.0.col-04-in some_7i77_input_e
net col5 matrix_kb.0.col-05-in some_7i77_input_f
net col6 matrix_kb.0.col-06-in some_7i77_input_g
net col7 matrix_kb.0.col-07-in some_7i77_input_h

Understood.
I can't get there with my "self knowledge about this programming level. Can you recommend some topics, so i can follow, about this subject?

I would read the hal tutorial:

linuxcnc.org/docs/html/hal/tutorial.html

lois wrote: Understood.
I can't get there with my "self knowledge about this programming level. Can you recommend some topics, so i can follow, about this subject?

Here's a nice little tutorial that will explain reading a keyboard matrix:

www.baldengineer.com/arduino-keyboard-matrix-tutorial.html

Focus on the part just after "Elements of a Keyboard Matrix". And keep your diodes...


And Peter's comment of "I was afraid you would ask..." had me cracking up.

Classic ladder isnt another option?
here one example using ladder for RSLogix500 (have many ways to do it using scan logic)

Mitsubishi offer free simulators just need to become member.
FX-TRN-BEG
FX-TRN-DATA
FX-TRN-POS
The last two just in japanese (shame) the DATA teach how to handlle 7 segment displays, BCD, keyboards, thumbwheel, outdated stuff (win98) but still usefull but now low end HMI is very cheap...
This one is another one nice for learn but isnt free like Mitsubishi
www.thelearningpit.com/lp/dwnloads.asp
www.youtube.com/results?search_query=FX-TRN-BEG

Give a try to Classic Ladder, have many ways to skin this cat.