Response Times - Siemens SIRIUS 3SK1 Equipment Manual

Configuration / operation

9.4 Response times

9.4 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 191)".
You can find the response data of the 3RM1 Failsafe motor starters in the technical
specifications in the "SIRIUS 3RM1 motor starters
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
Response time:
Example 2
3 x 3SK1220 + 3SK1122-.AB40 + 3SK1211-.BB40 + 3RM1 Failsafe motor starter
180
66295730)" manual.
40 ms 50 ms
(http://support.automation.siemens.com/WW/
SIRIUS 3SK1 Safety Relays and 3RQ1 Positively-Driven Coupling Relays
Equipment Manual, 05/2021, A5E02526190021A/RS-AE/005