# Realtime cycle

## Scope of a realtime cycle

A realtime cycle is defined in an NC program. It consists of a series of instructions and control structures, e.g. $IF conditions.

After the realtime cycle is loaded and started in the realtime part of the controller, it runs through every CNC cycle completely.

## Additional information

- Definition
- Separating definition and activation
- Validity
- Action at end
- Time-critical execution
- Managing realtime cycles
- $IF control structure
- Mathematical expressions