Siemens 3TK28 - Page 178

Description of the individual safety relays
3.8 3TK28 safety relays with contactor relay enabling circuits
3TK28 safety relays
178 Manual, 07/2016, NEB926157502000/RS-AB/003
3TK2856-.B...
3TK2857-.B...
Control supply voltage 1 for DC final rated value
• for DC rated value
V
24
Operating range factor control supply voltage rated value
of the magnet coil
• at 50 Hz
– for AC
—
—
• at 60 Hz
– for AC
—
—
• for DC
0.85
1.1
Product function
• automatic start
No
• rotation speed monitoring
No
• laser scanner monitoring
No
• light grid monitoring
No
• light barrier monitoring
No
• magnetic switch monitoring Normally closed contact-
Normally open contact
No
• magnetic switch monitoring Normally closed contact-
Normally closed contact
Yes
• emergency stop function
Yes
• protective door monitoring
No
• standstill monitoring
No
• step mat monitoring
No
• monitored start-up
No
Acceptability for application
• safety-related circuits
Yes
• safety cut-out switch
Yes
• magnetically operated switches monitoring
No
• EMERGENCY-OFF circuit monitoring
Yes
• proximity switches monitoring
No
• opto-electronical protection device monitoring
No
• position switch monitoring
Yes
• tactile sensor monitoring
No
• valve monitoring
No