Collaborative robot operations are standardized since, in consideration of the shared workspace, operators are exposed to possible contacts with moving parts of robots. Collisions with humans can be extremely hazardous: for this reason "safety functions", based on sensors, actuators and control systems, are adopted. If there is a failure in one of these components an accident can happen. Among the safety functions used, depending on the collaborative application, there is the "safety-rated

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... ored stop". Functional safety analysis can help system designers and integrators to certify the achievement of the required objectives for the chosen safety function. In the present paper, a similar analysis is carried out for the safety-rated monitored stop function. The method chosen, depicted with an example, is based on applicable standards.