3 Product description
This chapter provides information on the special features of the TR4 safety switch. It
de
scribes the design and operating principle of the device.
b
Always read this chapter before you mount, install, and commission the device.
3.1 Description of operation
Structure and function
T
he safety switch consists of two components:
•
A sensor
•
A coded actuator (transponder)
The sensor is mounted on the fixed part of the protective device, the actuator on the
moving part.
When the protective device is closed, the actuator is moved towards the sensor. If the
switch-on distance is reached, the actuator code is read out and evaluated by the sen‐
sor. If a valid actuator is located in the response range of the sensor, then the sensor
sets safety outputs OSSD 1 and OSSD 2 (semiconductor outputs) to High and the Aux
application diagnostic output to Low.
If the protective device is opened and the actuator is removed from the response range
of the sensor, then it sets safety outputs OSSD 1 and OSSD 2 to Low and the Aux appli‐
cation diagnostic output to High.
Coding
T
here are two different types of coding:
•
Universal coding
Universally coded sensors accept all universally coded TR4 actuators.
•
U
nique coding (products are labeled with “CODED”)
A “coded” actuator must be taught-in during commissioning. It is possible to teach
in up t
o 8 actuators in succession. Only the most recently taught-in actuator is
valid. Previously taught-in actuators can no longer be used.
see "Teach-in (uniquely coded variants)", page 17
Both the sensors and the actuator are coded. Universally coded sensors can only be
oper
ated with universally coded actuators. Uniquely coded sensors can only be oper‐
ated with uniquely coded actuators.
Fault detection
Any faults that occur, including internal device faults, are detected at the latest with the
next request to close the safety contacts (e. g. during machine start). The safety switch
then switches to safe state. If a fault is detected, the safety circuit is switched off and
the Status/Diag LED shows an error (see table 5, page 20).
Safe series connection
The number of safety switches in a safe series connection is nearly limitless. This has
an influence the response times, however. Ideally, the number of safety switches in a
safe series connection is set to a maximum of 30 devices.
In a safe series connection, only safety switches with inputs In 1 and In 2 can be used,
i. e. safety switch with cable or an 8-pin M12 connector.
Safety switches with a 5-pin M12 connector can only be used individually.
3 P
RODUCT DESCRIPTION
8
O P E R A T I N G I N S T R U C T I O N S | TR4 Direct Cylindrical 8022968/15V1/2019-11-22 | SICK
Subject to change without notice
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