Chapter 3 Operating Instructions
TR4
64 © SICK AG • Industrial Safety Systems • Germany • All rights reserved 8014467/YTD7/2016-03-30
Subject to change without notice
Product description
en
• 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 80.
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. 5 on page 89).
Cascading
TR4 safety switches 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 91). Ideally the number of safety switches in a
cascade is limited to a maximum of 30 devices.
Only safety switches with inputs In A and In B can be used in a cascade,
i.e. only safety switches with cable (TR4-S....P) or an 8-pin M12 connec-
tion plug (TR4-S..01C).
Safety switches of type TR4-S..02C have only a 5-pin M12 connection
plug and can therefore only be used individually.
Boundary area indication
The safety switches of type TR4-SExxxx and type TR4-SFxxxx are
equipped with a boundary area indication. The boundary area indica-
tion shows if the actuator is in the boundary area of the response range
with the sensor active (weak signal). The Status/Diag LED is illuminated
Ν Yellow then. The outputs are closed (high).
Notes
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