3.2.4 Safe series connection
Several safety switches can be connected in series in a safe series connection. The
connec
ted devices act like a single device.
The following options are available:
•
Safe series connection with Flexi Loop (with diagnostics)
In a series connection with Flexi Loop, the safety switches are connected to Flexi
L
oop nodes. Each Flexi Loop node evaluates a safety switch and sends the infor‐
mation to the Flexi Soft safety controller.
•
S
afe series connection with T-connector (without diagnostics)
In a series connection with T-connectors, several safety switches are connected
v
ia T-connectors and connected to the safe evaluation unit.
•
S
afe series connection in control cabinet (with diagnostics)
In a series connection in the control cabinet, the safety switches are led to the
cont
rol cabinet individually. The OSSDs of the safety switches are connected in
series there and evaluated by the evaluation unit. The Aux outputs are individually
connected to the programmable logic controller (PLC).
Further topics
•
"Safe series connection", page 15
•
"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
3.2.5 State indicators
The STATE light emitting diode (red/green) and the DIAG light emitting diode (yellow) sig‐
nal t
he operational state of the safety switch.
Complete overview of the light emitting diode states and their meanings: see "Diagnos‐
tic LEDs", page 30.
3.2.6 Protective functions
The safety switch has the following internal protective functions:
•
S
hort-circuit protection at all outputs
•
Cross-circuit monitoring at OSSDs
•
Overload protection on OSSDs
•
Supply voltage reverse polarity protection
3 P
RODUCT DESCRIPTION
10
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
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