Siemens SIRIUS 3SK1 Manual page 17

3SK1..1 and 3SK1..3 safety relays (devices with outputs using contacts):
In continuous operation, the key safety values apply where the function test interval (state
change of the outputs) for SIL2 ≤ 1 year and for SIL3 ≤ 1 month.
Exception: A function test interval ≤ 1 year is also permissible for SIL3 applications in the
process industry (in accordance with IEC 61511), exclusively for low-demand use, due to a
significantly lower failure rate/probability of the electromechanical components. This does
not apply to safety-related applications in accordance with the Machinery Directive
2006/42/EC.
3SK1..2 and 3SK1120 safety relays (devices with semiconductor outputs up to product
version E01/V1.0.0):
In continuous operation, the key safety values apply where the function test interval (state
change of the outputs) ≤ 1 year.
3SK1..2 and 3SK1120 safety relays (devices with semiconductor outputs from product
version E02/V1.1.0):
In continuous operation, the key safety values apply where the function test interval (state
change of the outputs) ≤ 20 years.
Function test procedure:
• Actuate the connected sensors.
• Check their effect on the safety relay and the downstream actuators.
• Activate the safety relay via the connected sensors.
• Check their effect on the safety relay and the downstream actuators.
• Replace the defective devices.
Note
3SK1..2 and 3SK1120 safety relays (devices with semiconductor outputs) as from
E02/V1.1.0 run power-on tests, so-called light tests, at regular intervals in the "OFF state".
As a result of light tests at the semiconductor outputs, the level changes to the ON state for
up to 2.5 ms. Users are responsible for ensuring that this does not result in any actuator
changing to the active state.
Note
3ZY12 device connectors
Only safety relays with a supply voltage of 24 V DC may be used on the 3ZY12 device
connector.
SIRIUS 3SK1 safety relays
Manual, 06/2018, A5E02526190021A/RS-AD/004
WARNING
WARNING
Product-specific safety information
2.1 General safety notes
17