Siemens 3TK28 - Terminal Assignment

Description of the individual safety relays
3.8 3TK28 safety relays with contactor relay enabling circuits
3TK28 safety relays
Manual, 07/2016, NEB926157502000/RS-AB/003
173
3.8.4.4
Terminal assignment
Terminal
Description
A1
L/+
A2 N/-
1
Cascade input
2 Safe solid-state output (24V DC / 1A)
3
Power supply for external switches
4
Input for functional switching
13; 14
Contact units (see contact units graphic)
1)
Auxiliary contact units
Figure 3-87 Contact units