Terminal Assignment; Inputs - Siemens SIRIUS 3SK1 Manual

3SK1 devices
5.1 3SK1 standard
5.1.4.4

Terminal assignment

A1
A2
IN1
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 being closed: before switching on)
● INK: Cascading circuit (cascading input / normal switching duty
● The cascading circuit is AND-connected with the sensor inputs IN1 and IN2 .
● ON-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:
IN1/T1, IN2/T2. The supply is taken in this case from test outputs T1 and T2. INF/T2 is
only checked for a short-circuit to P potential.
● 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.
Note
Observe the following special points during commissioning of the 3SK1112 safety relay:
The cascading input must be jumpered if it is not to be used.
Monitoring of the feedback circuits is not optional.
52
Terminal
+
-
Sensor channel 1
Sensor channel 2
START pushbutton circuit
Feedback circuit
Cascading circuit
Test output 1 (for IN1)
Test output 2 (for IN2, INF)
Safe output 1 (switching to P potential, 24 V DC solid-state)
Safe output 2 (switching to P potential, 24 V DC solid-state)
Signaling circuit 1 (switching to P potential, 24 V DC solid-state)
Explanation
Manual, 04/2013, A5E02526190021A/RS-AA/01
3SK1 safety relays