Per the ANSI B11.1-2013 code(6.12):
A stop performance monitor shall be designed, constructed, installed, and incorporated with the press control to prevent the initiation of a successive cycle (of a machine) if there is an increase in the stopping time or distance beyond the predetermined limit, and to display fault condition. Constructed and installed in a manner to monitor stopping performance on each safety stop. Capable of supervisory control for adjustment. Capable of monitoring stopping performance at any point in the cycle, and display the stopping performance.