Siemens 3TK28 - Page 16

Description of the individual safety relays
3.2 Overview
3TK28 safety relays
16 Manual, 07/2016, NEB926157502000/RS-AB/003
3TK28 speed/standstill monitoring
3TK28..
10-0
10-1
SENSORS
Electromechanical X X
Solid-state
-
X
Magnetically-operated switches - X
START TYPE
Auto
X
X
Monitored
-
X
ENABLING CIRCUITS
Instantaneous
3 NO + 1 NC
2 NO
Delayed
-
-
SIGNALING CIRCUITS
Relay
1 CO
Solid-state
2
2
Achievable SIL / PL
Max. achievable SIL acc. to
IEC 61508 / IEC 62061
3 3
Max. achievable PL acc. to
EN ISO 13849-1
e e
SENSORS
Without sensors
X
-
Sensors
-
PNP, NPN, HTL, TTL, SIN/COS, NAMUR
NO = normally-open; SS = solid-state; NC = normally-closed; CO = changeover
You will find further information on 3TK2810-1 speed/standstill monitors in Manual 3TK2810-
1 safety-related speed monitor
(http://support.automation.siemens.com/WW/view/en/43707376)