Siemens SIRIUS 3RK3 - Page 176

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Figure 6-5 Reaction times "sensor - actuator" - Part 2
Reaction time "sensor - actuator"
(in error-free operation)
t
RSA
= t
S
+ t
IN
+ t
RL
+ t
Q
+ t
A
Fault reaction time "sensor - actuator" t
FRSA
= t
S
+ t
IN
+ t
FRL
+ t
Q
+ t
A
Formula Explanation
S Sensor (provides an OFF or ON signal)
IN Input terminal
Q Output terminal
A Actuator
t
RSA
Reaction time of the system from a sensor (S) to an actuator (A)
(in error-free operation)
t
FRSA
Fault reaction time of the system from a sensor (S) to an actuator (A)
Operation
6.1 Response times
SIRIUS 3RK3 Modular Safety System
176 Equipment Manual, 07/2020, NEB926253002000/RS-AC/006