A116 mechanical brake alarm in ABB DCS800 drive an issue with the mechanical brake system. This could be related to the brake's engagement time, release time, or overall functionality.

1. The acknowledge signal for brake closed (applied) is missing.
2. Issues with the external control signal that triggers the brake.
3. Visually inspect the brake pads for wear and damage.
4. Review the brake parameter settings, such as engagement time, release time, and current limit.