# Dry run

Dry Run is activated by transferring the program start option 0x40 MACHINE_LOCK on the HLI to the controller at program start (see documentation on the HLI).

In Dry Run mode, the NC program is decoded normally and the positions are interpreted. Axis motions are not forwarded to the position controller, meaning that there is no axis motion.

Contour visualisation in Dry Run

## Notice

When the operation mode is changed from normal mode to dry reun, all axes and spindles must be at standstill.

If this is not the case, the error ID 60269 is output when the spindle is selected.