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2110788-13-03/20 (Translation of the original operating instructions)
Operating Instructions
Transponder-Coded Safety Switch CET.-AR-…
EN
10.10. Connection of several CET-AR in a switch chain
Important!
Ì An AR switch chain may contain a maximum of 20 safety switches.
Ì The subsystem CET-AR complies with PLe in accordance with EN13849-1.
Ì On the use of the CET-AR with feedback loop and start button, this must be in the last position in
the switch chain (see Figure 14 on page 34).
Ì The example shows only an excerpt that is relevant for connection of the CET system. The exam-
ple illustrated here does not show complete system planning. The user is responsible for safe inte-
gration into the overall system. Detailed application examples can be found at www.euchner.com.
Simply enter the order number of your switch in the search box. You will nd all available connec-
tion examples for the device in Downloads.
Ì For information about the safety assessment for AR switch chains, see chapter 3. Description of
the safety function on page 6.
The series connection is shown here based on the example of the version with plug connectors 2 x M12. The series con-
nection of the version with plug connector M23 (RC18) has similar behavior, but is realized using additional terminals in a
control cabinet.
The switches in the version with plug connectors 2 x M12 are connected one after the other with the aid of pre-assembled
connection cables and Y-distributors. If a guard is opened or if a fault occurs on one of the switches, the system shuts
down the machine. A higher level control system cannot, however, detect which guard is open or on which switch a fault
has occurred with this connection technology.
The safety outputs are permanently assigned to the respective safety inputs of the downstream switch. OA must be
connected to IA and OB to IB. If the connections are interchanged (e.g. OA to IB), the device will enter the fault state.
Always use the RST input in series connections. All switches in a chain can be reset at the same time with this reset input. To
do this, a voltage of 24V must be applied to the RST input for at least 3s. If the RST input is not used in your application,
it should be connected to 0V.
Note the following on this aspect:
Ì A common signal must be used for all switches in the chain. This can be a changeover switch or the output of a control
system. A pushbutton is not suitable, because Reset must always be connected to GND during operation (see switch
S11 in Figure 14 on page 34).
Ì Reset must always be performed simultaneously for all switches of the chain.
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