Operator Control; Response Times - Siemens Sirius 3RK3 System Manual

Operator control

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