S16 is added to first move

M3
G1X0.2688Y1.1058S16F50
The S value varies with different jobs. I am using Lightburn on a pen plotter and at this point a S value of 40 is used on the servo pwm. Where is this value calculated and can it be controlled?

This may be worth your review for how the LightBurn ‘S-Value Max’ setting interacts with your $30 S-Value firmware setting. Device Settings - LightBurn Software Documentation

I may be getting random numbers because my grbl firmware for the control board I am using is .9i and has no $30 option. I will just have to edit the gcode files to enter what I need. Thank you for you quick response.

The S value is (Layer power) x (S-value Max). That’s it.

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