Inputs - Siemens SIRIUS 3SK1 Equipment Manual

IN2
INS
INF
INK
T1
T2
Q1
Q2
QM1
5.1.4.5

Inputs

The device has five inputs for safe signal processing: IN1, IN2, INS, INF, INK:
• IN1: sensor input channel 1
• IN2: sensor input channel 2
• INS: START pushbutton circuit (start after rising and falling edge)
• INF: feedback circuit (checked for closed state: before switching on)
• INK: cascading circuit (cascading input/normal switching duty)
• The cascading circuit is AND-connected with the IN1 and IN2 sensor inputs.
• START button circuit and cascading circuit are activated with a static +24 V DC signal.
• With cross-circuit detection activated, the following inputs are checked for cross-circuits and
short-circuits to P: IN1/T1 to IN2/T2 and INF/T2. The inputs then receive their supplies from
the test outputs T1 and T2.
• If "without cross-circuit detection" is set on the device, inputs IN1 and IN2 are not checked for
cross-circuits. Inputs IN1 and IN2 must not be supplied via T1/T2 here, otherwise a fault will
be generated via input INF. It is therefore essential that inputs IN1 and IN2 are supplied via
an external + 24 V DC current source from which the device is also supplied.
• If the unit is parameterized to 2 x 1-channel with DIP switch 3, the sensor circuit that is not
used (T1/IN1 or T2/IN2) must be bypassed.
Note
Observe the following special points during commissioning of the 3SK1112 safety relay:
The cascading input must be connected to terminal A1 if it is not to be used.
Monitoring of the feedback circuits is not optional.
SIRIUS 3SK1 Safety Relays and 3RQ1 Positively-Driven Coupling Relays
Equipment Manual, 05/2021, A5E02526190021A/RS-AE/005
Terminal
Sensor channel 2
START pushbutton circuit
Feedback circuit
Cascading circuit
Test output 1 (for IN1)
Test output 2 (for IN2, INF)
Semiconductor output 1 (switching to P potential, 24 V DC)
Semiconductor output 2 (switching to P potential, 24 V DC)
Semiconductor signaling circuit 1 (switching to P potential, 24 V DC)
3SK1 / 3RQ1 devices
Explanation
5.1 3SK1 standard
63