# ID 20823

An ECS must not be defined with DEF.
Description | It is not possible to define an effector coordinate system (ECS) in the NC program with the syntax element "DEF". The definition of the ECS-axes is based implicitly on the orientation of the tool axis. [PROG// Section: Effector Coordinate System (ECS)]
Response | Class | 2 | Abort NC program processing.
Solution | Class | 3 | Check and modify the command #ECS.
Error type | 1, Error message from NC program.