Siemens SIRIUS 3RK3 - Page 179

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