Safety Features - SICK TR4 Instrucciones De Operación

GB
Chapter 3
Notes
140
© SICK AG • Industrial Safety Systems • Germany • All rights reserved
Product description
Up to eight actuators can be taught-in on the TR4 Unique Coded.
The TR4 Unique Coded only ever accepts the last actuator taught-in.
The TR4 Unique Coded can be locked at any time. It is then no longer
possible to teach-in a new actuator. Only the last actuator taught-in is
valid.
See also section 6.2 "Teach-in (TR4 Unique Coded)" on page 152.
Error recognition
Any errors that occur, including internal device errors, are detected on
the next request to close the safety contacts (e.g. on machine start).
The safety switch then switches to the safe state. If errors are detected,
the safety circuit is switched off and the Status/Diag LED indicates an
error (see Tab. 4 on page 161).
Cascading
The TR4 safety switch can be used separately or in a cascade (series
connection). The number of safety switches in a cascade is almost
unlimited. However this configuration has an effect on the response
time (see section 9.1.2 "Response time for multiple cascaded TR4
safety switches" on page 163). Ideally the number of safety switches in
a cascade is limited to a maximum of 30 devices.
3.2

Safety features

The TR4 safety switch has the following safety features:
up to PDF-M according to EN 60 947J5J3
up to SIL3 according to IEC 61 508
up to category 4 according to EN ISO 13 849J1
up to PL e according to EN ISO 13 849J1
Operational safety
The TR4 safety switch has the following internal protective functions:
short-circuit protection on all outputs
overload protection on all outputs
reverse polarity protection of the operating voltage
Operating Instructions
TR4
8014465/2012-05-07
Subject to change without notice