Siemens SIRIUS 3SK1, Manual

Page: 52 / 262

3SK1 devices
5.1 3SK1 standard
3SK1 safety relays
52
Manual, 04/2013, A5E02526190021A/RS-AA/01
5.1.4.4 Terminal assignment
Terminal Explanation
A1 +
A2 -
IN1 Sensor channel 1
IN2 Sensor channel 2
INS START pushbutton circuit
INF Feedback circuit
INK Cascading circuit
T1 Test output 1 (for IN1)
T2 Test output 2 (for IN2, INF)
Q1 Safe output 1 (switching to P potential, 24 V DC solid-state)
Q2 Safe output 2 (switching to P potential, 24 V DC solid-state)
QM1 Signaling circuit 1 (switching to P potential, 24 V DC solid-state)
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 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 ex 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.