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Chapter
6
Operating Instructions
UE4155
34
© SICK AG • Industrial Safety Systems • Germany • All rights reserved
8010178/TF82/2010-03-05
Subject to change without notice
Examples of circuits
6.2
Electro-sensitive protective equipment (ESPE) with
output signal switching device (OSSD)
In the connection of electro-sensitive protective equipment (ESPE), senders ( ) and re-
ceivers ( ) can be considered as a system’s inputs and outputs. Senders and receivers
use the same power supply (output Out A, static 24 V). You can use output Out B to test
the sender, alternatively as an output signal from the FPLC or assigned Static 24 V. The
switching outputs of the receiver are present on inputs In A and In B.
The functional earth of the ESPE is normally provided via the screened field-signal con-
nections. However, the functional earth cannot be looped via the two-way splitter. In this
case, you must mount the ESPE that the ESPE housing is earthed on the machine
support.
In order to meet the requirements for category 4 according to EN ISO 13 849
D
1, the
ESPE must have two tested semiconductor switching outputs and its own short-circuit
detection. In the case of single-channel switching outputs only category 2 can be
realised for this type of connection.
If a test input is connected to the ESPE, this must be executed as an input that draws
current.
6.3
Muting sensor untested
Suitable muting sensors are e.g. reflective photoelectric proximity switches, reflective
photoelectric switches, one-beam photoelectric switches and magnetic proximity sensors.
Fig. 11: Example of a circuit
for electro-sensitive
protective equipment on the
field-signal connection
Notes
Fig. 12: Example of a circuit
for an untested Muting-
Sensor
Test input
24 V
24 V
OSSD2
OSSD1
Sender
Receiver
Q
24 V