Asigning value from nc-code to HAL parameter

I have problem to write value from nc code to hal parameter.

I remapped G50 and defined to accept "S" parameter.

I would like this G50 command to pass value after "S" to Hal parameter.

How can i make this happen?

I can debug it like: (debug,value of S is #<S>) and it gives correct value. But how to write this to HAL parameter?

Is there some reason you cannot use M67 or M68?

I made "limit spindle max rpm" HAL component for lathe and I would like to use G50 as it is generally used as RPM limit in Fanuc based machines.

I tried do it like this :

G50 S1200.0

G50 mapped to subprogram, which call M120 P#<S>


Inside M120

#!/bin/bash
rpmlimit=$1
halcmd setp spindlelimit.rpm-limit $rpmlimit
exit 0

But there is also problems with this one.
Even calling M120 P1200.0 directly in MDI,
will not change parameter, but goes thru without error and shuts down spindle.

Using line directly in "Show HAL Configuration" setp spindlelimit.rpm-limit 1200.0 will change parameter

Calling any even empty user defined M-command will shutdown Spindle???
Is this a bug? My mill 2.8 pre will not act this way.

I does not mater 1200 or 1200.0 same behavior.
I tried both, cause 1200.0 is float and 1200 could be read as integer.