Siemens SIRIUS 3RK3 - 7 Operator Control; Response Times

Modular Safety System 3RK3
System Manual, 10/2008, 926 2530-02 DS 02
207
Operator control
7
7.1 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 calculate 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.
Values required for calculating the response time t
R
of the Modular Safety System 3RK3
To calculate the response time t
R
of the MSS, use the following values:
● Fixed values:
– Output time of the expansion modules (t
OUT
):
◆ Solid-state outputs: 10 ms
◆ Relay outputs: 20 ms
● Parameters you assigned during configuration:
– Program cycle time t
CYCL
of the central unit: 10 to 60 ms
– Input delay t
DELAY
for monitoring functions and input cell at the inputs of the expansion
modules
– Timer functions in the logic (timer): t
Timer
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Figure 7-1 Maximum response time of the Modular Safety System 3RK3