Siemens SIRIUS 3RK3 Equipment Manual page 181

4
Figure 6-10 Signal flow of example 2
The reaction times are calculated as follows:
Figure 6-11
*The AS-i slave only has to be considered if the utilized slave does not forward the changed input
signal directly to the bus and its signal processing thus contributes to the system reaction time.
Refer to the documentation of the input slave for the appropriate value.
Reaction time "sensor - actuator"
"Sensor - actuator" fault reaction time;
for a single-channel actuator wiring not equal
to t
Formula
t
RSA_2
t
FRSA_2
t
S
SIRIUS 3RK3 Modular Safety System
Equipment Manual, 07/2020, NEB926253002000/RS-AC/006
Reaction times MSS 3RK3 Advanced - example 2
RSA_2
Description
Reaction time "sensor - actuator" in error-free operation
"Sensor - actuator" fault reaction time; for a single-channel actuator wiring not equal to t
For the reaction time of the sensor (S), see the documentation of the sensor.
(If an immediate response cannot be assumed for the AS-i slave, the reaction time of the AS-
i slave must also be considered at this point. Note also example 3.)
6.1 Response times
t = t + (2 x t ) + t
RSA_2 S CYCLasi RL
t = t + t
FRSA_2 RSA_2 FB
Operation
6
+ t + t
OUT A
RSA_2
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