SICK TR4 User Manual

Operating Instructions Chapter 5
TR4
8014467/YTD7/2016-03-30 © SICK AG • Industrial Safety Systems • Germany • All rights reserved 77
Subject to change without notice
Electrical installation
en
5.3.4 Connection of several safety switches in a cascade
Several safety switches with cable (TR4-S....P) or an 8-pin M12 connec-
tion plug (TR4-S..01C) can be cascaded (connected in series). The num-
ber of safety switches in a cascade is almost unlimited. However it will
have an effect on the response time of the system (see section 9.1.2
“Response time for multiple cascaded TR4 safety switches” on
page 91). It is therefore recommended not to use more than 30 safety
switches in a cascade.
Use external device monitoring!
The TR4 has no external device monitoring. To achieve SIL3/PL e you
must therefore implement external device monitoring with the aid of
suitable higher level safety evaluation.
The actual performance level or safety integrity level achieved depends
on the external circuit, the design of the wiring, the selection of the con-
trol switch and its placement on the machine.
Evaluate both safety outputs!
To ensure safety it is imperative you evaluate both safety outputs
(Out A and Out B) (see Fig. 7).
Prevent tampering!
On the usage of T-plug connectors for cascading you must mount the
connecting cables such that simple bypassing of the safety switch is
not possible.

WARNING

SICK TR4 Specifications

General

Number of Safe Outputs	2
Output Type	PNP
Protection Rating	IP67
Type	Safety Switch
Housing Material	Plastic
Supply Voltage	24V DC
Connection Type	Cable
Operating Voltage	24 V DC
Operating Temperature	-25 °C ... +70 °C
Actuator Type	Separate actuator (TR4 Direct, TR4 Standard, TR4 Extended)