SICK STR1, Operating Instructions Manual

Page: 16 / 52

Table 5: Maximum number of safety switches in a series connection depends on the voltage
Voltage Connection cables,
uniform for the entire
series connection Input voltage at 30th
safety switch Maximum number of
safety switches in
series connection
24 V Length: 2 m
Cable cross-section:
0.25 mm² 17.8 V 24
26.8 V 19.2 V 30
Complementary information
The number of safety switches in a series connection influences the response time of
the system (
see "Response time and release time in a safe series connection",
page 39 ).
Further topics
• "Safe series connection with Flexi Loop (with diagnostics)", page 16
• "Safe series connection with T-connector (without diagnostics)", page 17
• "Safe series connection in control cabinet (with diagnostics)", page 18
4.4.3.1 Safe series connection with Flexi Loop (with diagnostics)
Prerequisites
• Safety switch with male connector, M12, 5-pin
or
• Safety switch with male connector, M12, 8-pin
Construction
The safe series connection can be created using Flexi Loop nodes.
3 3 4 5 9 5 2 1
5 5 6
7 7
8
Figure 5: Safe series connection with Flexi Loop nodes
1
Flexi Soft safety controller
2
Connecting cable with female connector, M12, 5-pin
3
FLN-OSSD1000105 Flexi Loop node
4
FLN-EMSS1100108 Flexi Loop node
5
Connection cable with male connector, M12, 5-pin and female connector, M12, 5-pin
6
Connection cable with male connector, M12, 8-pin and female connector, M12, 8-pin
7
STR1 safety switch
8
Safety locking device
9
FLT-TERM00001 Flexi Loop terminating element
4
PROJECT PLANNING
16 O P E R A T I N G I N S T R U C T I O N S | STR1 8018754/12IU/2020-01-30 | SICK
Subject to change without notice