EUCHNER CES-AZ-ABS-01B (Unicode) - Manual (Page 6)

Operating Instructions Safety System CES-AZ-ABS-01B
6
Function
The safety system CES-AZ-ABS... complies with the following safety requirements:
Ì
Category 3, PLe according to EN ISO 13849-1
Ì
Proximity device with self-monitoring type PDF-M according to EN 60947-5-3.
Ì
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.
Ì
When the safety guard is opened and closed, it is checked whether the safety
system relays open and close correctly.
The CES non-contact safety systems consist of three components:
Ì
Coded actuator
Ì
Read head
Ì
Evaluation unit
1 read head may be connected to the evaluation unit CES-AZ-ABS...
Each delivered actuator possesses a unique electronic coding and so is a unique
element in the system used. The code in an actuator cannot be reprogrammed.
The read head is fastened to the fixed part of the safety guard and is connected
to the evaluation unit via a two-core screened cable.
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.
The bit pattern read is compared with the code saved in the evaluation unit; if the
data matches, the safety outputs (relay outputs) are enabled and the door monitor-
ing output OUT (semiconductor output) is also set HIGH.
Due to the dynamic polling of the actuator and the redundant, diverse design
of the safety electronics, the evaluation unit will enter the safe state with every
detectable fault.
When the safety guard is opened, the safety outputs switch off the safety circuits
and the door monitoring output (OUT) is switched LOW. The state of the safety
outputs is monitored internally by positively driven NC contacts (relay output).
If an internal fault occurs in the evaluation unit, the safety circuits are switched
off, the diagnostic output (ERROR) is set HIGH and the ERROR LED lights up red.
The safety contacts on evaluation unit can also switch small currents. Since small
currents can be switched, the user has the option of connecting the evaluation
unit directly to a safe control system.