Configuration / operation
10.2 Explanation of the device's functions
3SK1 safety relays
180 Manual, 04/2013, A5E02526190021A/RS-AA/01
10.2 Explanation of the device's functions
Explanation of the device's functions (DIP switches)
DIP
switch
Parameter Function
1 Start type
• Autostart: The enabling circuits are switched to the active position as soon as the
switch-on condition is satisfied at the sensor inputs IN1, IN2, INF and 1. The START
button connection terminal INS is not queried.
• Monitored start: The enabling circuits are switched to the active position as soon as the
switch-on condition is met at the sensor inputs IN1, IN2, INF and 1 and the START
button at the terminal INS is actuated (start with the falling edge).
2 Cross-circuit
detection
Cross-circuit detection is only possible with floating sensors. The sensors must be switched
between T1 - IN1 and T2 – IN2 for this purpose. On terminals IN1 and PAR (if used), the
device expects the test signal of terminal T1; and on terminals IN2 and INF , it expects the
test signal of T2 . The device detects a sensor fault if the signal at terminals IN1, PAR or
IN2, INF does not agree with test signals T1, T2.
Cross-circuit detection must be deactivated if electronic sensors such as light arrays or
laser scanners are connected. The 3SK1 now no longer monitors the sensor inputs for
cross-circuit detection. Usually, the outputs of safety sensors (OSSD) are already
monitored for cross-circuits in the sensor.
Devices with PAR terminals expect the test signal T2 at the parameterization input. A 24 V
signal at the PAR or INF terminals results in a fault (cross-circuit at the input).
3 Type of
connection
• 1 sensor with 2 contacts (1 x 2-channel) (NC/NC).
It is expected here that both contacts were open simultaneously.
With the additional connection of T1 to PAR, this DIP parameterization applies for ONE
2-channel sensor with NC/NO contacts.
• 2 sensors with one contact each (2x single-channel) (NC/NC).
It is expected that both sensors are ANDed. Simultaneity is not monitored.
4 Startup testing After a power failure, startup testing requires that the sensors at IN1 and IN2are actuated
once by the system operator.
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