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Not sure I understand:

if you change baudrate to max speed

Are you changing the I/O modules baud rate or LinuxCNCs baudrate?

By reboot do you mean power cycle of the I/O module?
 
Edit: I tested changing the baud rate on one of my 25IOC32_PNP modules
(from the default 9600 baud to 115200 baud = baudrate selector 7)

It seem to work OK and I have power cycled the module many times and its
still OK at 115200 baud.

NOTE:
 Since changing the 25IOC32 cards non-volatile baud rate is slow I suspect
you need to set the update rate low _AND_ only run the modbus code with the
setbaud option enabled for a short time (you may damage the card if you run it
continuously, I don't know how many write cycles its non-volatile storage is rated for)

I think ideally, a different .mod file/hal/ini file should be used just for setting baud rates
or other non-volatile parameter setting, and mod files that access non-volatile parameters
never be used for normal operation.
 

An analog circuit with a 0V negative reference cannot swing all the way down to 0V
so the 45 mV 0 level is expected. Also linearity of the output should be better than 1%.

Normally the 0 level is not too important as the spindle enable should be false so the
drive is disabled at that point. If you want to improve the accuracy, you can use the
lincurve component, but note that spindle speed accuracy is not terribly important
for most applications.

What type of sensor is it?
Inductive?
Continuity?
Voltage?
Thermocoupled?
Wire tension? ( basically a normally closed switch and spring )
At least those are the types I could think of being used. Their probably more.

Some posts just got deleted here????

Why was this deleted?

Well, my tests yesterday showed tiny problems with the frequency. If I set the output to zero/stop, the voltage at TB4, Pin 2 Spindle Out is 0,045V and the VFD shows 1,56 Hz. The Input voltage at Pin 3 is 9,99V.
Next inaccuracy is frequency setting at S3000 ->50Hz, output is at 2,3V and 45,8 Hz instead of 2,5V and 50Hz.

What can I do to put Pin 2 to zero Volt? Is this a problem of the 7i76e/Lcnc or do I have to calibrate my VFD?

Thanks for your help, again!
Hanno

I need to pass a specific value of the control word, but the pin cannot be written from .hal and I need to solve a problem with recording a value, I can't figure out where it comes from