EUCHNER CES-A-S5H-01 (Unicode) - Manual (Page 6)

System Manual Safety System CES-A-S5H01
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System Description
The safety system CES-A-S... complies with the following safety requirements:
Category 4, PLe according to EN ISO 13849-1
Proximity device with self-monitoring type PDF-M according to EN 60947-5-3.
Redundant design of the circuit in the evaluation unit with self-monitoring. As a
result, the safety system is still effective even if a component fails.
The switching state of the semiconductor outputs is checked internally when
the safety guard is opened and closed.
The CES non-contact safety system consists of three components:
1 coded safety actuator as well as up to 14 coded position actuators (dogs).
Safety switch with integrated read head
Evaluation unit
On the safety switch CES-A-S... the read head is integrated with the evaluation unit
in a standard housing according to EN 60947-5-.
Each delivered safety actuator possesses a unique electronic coding and so is
a unique element in the system used. The code in an actuator cannot be repro-
grammed. The position actuators have a fixed transponder number from to F
(hex). Up to a maximum of 15 different actuators can be used per device: 1 safety
actuator (red) and 14 different position actuators (green).
The evalation unit with integrated read head is fastened to the fixed part of the
safety guard.
The actuator fastened to the movable part of the safety guard is moved towards the
read head by closing the door. When the switch-on distance is reached, power is
supplied to the actuator by the inductive read head and data can be transferred.
For safety actuators the bit pattern read is compared with the code saved in the
evaluation unit, if the data match the safety outputs are enabled (semiconductor
outputs LA and LB). For position actuators the related transponder number is output
to a higher level control system on the four semiconductor outputs (D0, D1, D,
D3) as a 4-bit binary code. The four LEDs (D0, D1, D, D3) on the device indicate
the status of the semiconductor outputs (D0, D1, D, D3).
Due to the combination of dynamic polling of the actuator and the redundant,
diverse design of the safety electronics with the two feedback safety outputs, the
evaluation unit will enter the safe state with every detectable fault.
The state of the safety outputs is monitored internally by two microprocessors.
On an internal fault in the evaluation unit, the safety circuit is switched off and the
OUT/ERROR LED illuminates red.
The evaluation unit has a redundant switching design with self-monitoring. This
means that the safety system is still effective even if a component fails.
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