Subject to technical modifications, no responsibility is accepted for the accuracy of this information. © EUCHNER 2015
AP000178-02_03/15
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Functional description
General
The CES-AP is part of an interlocking device in accordance with EN ISO 14119. The two safe outputs of the last CES-AP are
connected to a PNOZ s4.1 safety relay.
Connections
Designation
Function
Use in this example
FO1A, FO1B
Safety outputs. HIGH when the safeguarding device
is closed and the actuator is in operating distance.
Switch-off of at least one of the outputs leads to a direct
switch-off of the safety contacts (13 – 14, 23 – 24, …) of
the safety relay PNOZ s4.1.
Important: The actual shutdown of the energy which is
causing a hazard in a machine is not shown in the example
and must be supplemented.
OD
Monitoring output. HIGH when outputs FOIA and
FOIB are switched on (safety guard closed).
Function is not used.
Safety assessment
The CES-AP features complete monitoring for faults in the safety-relevant parts and in the connected cables (clock pulses at
outputs FO1A and FO1B). The safety relay PNOZ s4.1 achieve up to PL e according to the manufacturer’s information (see the
device’s operating instructions for this purpose). The wiring corresponds to the circuit “light barrier or safety switch with detection
of shorts across contacts via ESPE” in the operating instructions of the PNOZ s4.1. Therefore, PL e in accordance with EN ISO
13849-1 can be achieved for position monitoring of a safety guard and for interlocking (preventing the operation of a machine
element under certain conditions).
Important: Switch-off of the energy and any necessary monitoring energy switch-off (feedback loop) of the hazard are not part of
this document and must be added in accordance with the risk assessment for the machine. In this example, the safety evaluation
unit without feedback loop and without start button is used. Please refer to the operating instructions of the safety evaluation unit
for more information.