Fault Tolerance - SICK TR4 Mode D'emploi

en
Chapter 5
WARNING
64
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Electrical installation
5.2

Fault tolerance

If the device does not appear to function after the application of the
supply voltage (e.g. Status/Diag LED does not flash), the safety
switch must be replaced.
The supply voltage is reverse-polarity protected. The contacts
In A/In B and Out A/Out B are short-circuit protected.
A cross-circuit between Out A and Out B is detected by the safety
switch. A cross-circuit in the cable can be prevented by laying the
cable with protection.
A short-circuit on Out A or Out B to 24 V DC is detected. It is impe-
rative a simultaneous short-circuit on Out A and Out B to 24 V DC
is excluded by laying the cable with protection.
Cables must be laid with protection!
To prevent the accumulation of errors within the risk time, for applica-
tions as per SIL3 (IEC 61 508) and category 4 (EN ISO 13 849) it is
imperative to lay the cables with protection.
Operating Instructions
TR4
8014465/YIJ2/2015-03-02
Subject to change without notice