Siemens SIRIUS 3RK3 Equipment Manual page 179

Figure 6-7
The reaction times are calculated as follows:
Figure 6-8
Reaction time "sensor - actuator"
(in error-free operation)
Fault reaction time "sensor - actuator";
for AS-i output signal identical to t
Formula
t
RSA_1
t
FRSA_1
t
S
t
CYCLasi
t
RL
SIRIUS 3RK3 Modular Safety System
Equipment Manual, 07/2020, NEB926253002000/RS-AC/006
3
Signal flow of example 1
Reaction times MSS 3RK3 Advanced - example 1
Description
Reaction time "sensor - actuator" in error-free operation
Fault reaction time "sensor - actuator"; for AS-i output signal identical to t
For the reaction time of the AS‑i sensor (ASI S), see the documentation of the sensor.
AS-i cycle time, max. 5 ms
• Transmission duration from signal acquisition on the safety-related AS-i input slave
(ASI IN) to the logic of the MSS 3RK3
• Transmission duration from the logic of the MSS 3RK3 to the input terminal on the safety-
related AS-i output (ASI Q)
Reaction time of the logic of the MSS 3RK3 in error-free operation
6
t = t + (2 x t
RSA_1 S
= t
RSA_1
6.1 Response times
) + t + (2 x t
CYCLasi RL CYCLasi
+ (4 x t ) + t + t
S CYCLasi RL A
t = t
FRSA_1 RSA_1
t = t
RL FRL
RSA_1
Operation
) + t
A
179