# Direct/indirect deselection of TRC

When TRC is selected directly or indirectly, an exit block is generated in the selected compensation plane with the next motion block after a programmed G40.

When TRC is deselected, G138 can select an alternative exit strategy (direct deselection of TRC) besides the standard exit strategy (indirect deselection of TRC).

The figures below show all the possible exit blocks with all contour transitions. Two NC blocks NC10 and NC20 are shown for the 3 relevant contour transition angles.

## Additional information

- Direct deselection (G138/G40)
- Indirect deselection (G139/G40) with G25
- Indirect deselection (G139/G40) with G26