Siemens 3TK28 - Structure 3 TK2820; Terminal Assignment

Description of the individual safety relays
3.6 3TK28 safety relays with relay enabling circuits
3TK28 safety relays
34 Manual, 07/2016, NEB926157502000/RS-AB/003
3.6.2.3
Structure 3TK2820
Front view
No.
Meaning
①
Display LEDs
②
Removable terminal blocks
③
Selector switch
④
Labels
3.6.2.4
Terminal assignment
Terminal
Description
A1
L/+
A2
N/-
IN1
Sensor channel 1
IN2
Sensor channel 2
IN3
ON button, feedback circuit
T1
Test output 1 (for IN1)
T2
Test output 2 (for IN2)
T3
Test output 3 (for IN3)
13 - 14 Enabling circuit 1 (NO, relay contact)
23 - 24
Enabling circuit 2 (NO, relay contact)
33 - 34
Enabling circuit 3 (NO, relay contact)
41 - 42
Signaling circuit (NC, relay contact)