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Analog voltage from inductive sensor? Is that the position sensor for the ram/cylinder?
Maybe using the values from that sensor to home or to check and retract the ram at LinuxCNC start?
Also use the value from that sensor to stop the machine from moving anything else if not in upper position. I would strictly tie this to motion feed hold if this is punch press so the part can not move until the ram is up. This i think is a must on such machines. Also to make sure the material has stopped before ramming down...

Getting a Hunk #1-9 succeeded, and a few lines later (right after trace.c) a HUNK #1 failed during the patch. 

install and kernel activation does seem to complete if it’s ignored. 

Is the cylinder controlled by -10 volts advances and +10 volts retracted position 0 volts gradually descends
Note: I am using translate google sorry for any inconvenience

Thanks for the feedback, good suggestion, but since I'm very late on this project, physically installing a sensor will take more time and I don't know if the client will accept it on the next visit. Your idea helped me to try a different way, maybe never tried before in LinuxCNC, which would be to take the analog voltage reading from the inductive sensor that is present and already part of the original machine and create a logical ladder to compare the voltage from zero to 10V where 8.6 volts would be the virtual limit switch. With your experience, do you think it is possible to use an analog reading and determine certain thresholds to turn on and off a bit memory in the ladder and use it as a limit switch?