Response Times - Siemens SIRIUS 3SK1 Manual

Configuration / operation

10.4 Response times

10.4 Response times
Verification of response times in the case of safety circuits
When safety equipment is commissioned, steps must be taken to verify that a safety-related
output will switch off within a maximum permissible response time if the input signal changes
at the relevant input.
To provide this verification, you must determine the total response time of the application you
have configured.
Note
Note that the calculation of the response time affects the level of safety and governs the
overall design of the system.
You can find the response data of the safety relays in the technical specifications of the
respective devices in the chapter "Technical data (Page 203)".
You can find the response data of the 3RM1 Failsafe motor starters in the technical
specifications in the manual "SIRIUS 3RM1 motor starters
(http://support.automation.siemens.com/WW/view/EN/
Calculation of the response times
To calculate the response times of the overall system configuration, you must add up the
individual response times of all input expansions affected by deactivation and also the
response time of the basic unit.
If output expansions are used, the response times of the relevant output module are also
added to the total time from the sensor to the actuator.
Examples
Example 1
3SK1121-.AB40 + 3SK1211.BB40
194
66295730)".
SIRIUS 3SK1 safety relays
Manual, 06/2018, A5E02526190021A/RS-AD/004