Siemens SIRIUS 3RK3 - Selection of Sensors and Actuators; Requirements for Sensors; Minimum Actuating Duration at the Inputs; Requirements for Actuators

6.2 Selection of sensors and actuators
6.2.1 Requirements for sensors
6.2.1.1 Minimum actuating duration at the inputs
Design of sensors
The minimum actuating duration at the input of the MSS 3RK3 is the length of time for which
a signal must be present at the input to ensure that it can be reliably detected. Please observe
this time when selecting suitable sensors.
t
MIN
= 2 x t
CYCL
t
MIN
Minimum actuating duration at the input terminals of the MSS 3RK3
t
CYCL
Program cycle time of the MSS 3RK3
Note
Minimum actuating duration of AS‑i sensors
The minimum actuating duration of the AS-i sensors depends on the AS-i slave used.
6.2.2 Requirements for actuators
Capacitive load
A speci󹪝c capacitive load must not be exceeded at the connected actuators. The maximum
capacitive load depends on the load current.
When selecting suitable actuators, make sure that the actuator does not exceed the permissible
capacitive load; see also Chapters "Dark test (Page 189)" and "Guidelines for capacitive loads
(Page 190)."
Inductive load
The outputs of the MSS 3RK3 do not feature internal inductive interference protection. If
inductive loads are operated at the solid-state outputs of the MSS 3RK3, they must be provided
with inductive interference protection; see Chapter "Guidelines for inductive loads (Page 190)."
Operation
6.2 Selection of sensors and actuators
SIRIUS 3RK3 Modular Safety System
188 Equipment Manual, 07/2020, NEB926253002000/RS-AC/006