EUCHNER CETx-AS-xxx-CB-xxx (Multicode) - Manual (Page 6)

Operating Instructions Safety Switch CET.-AS-...-CB-...
6
Function
Function of the electronics
Safety switches series CET.-AS permit locking of movable safety guards. They
meet the following safety requirements:
Ì Category 3, PLe according to EN ISO 13849-1 (mounting head upward)
Ì Category 4, PLe according to EN ISO 13849-1 (mounting head downward or
horizontal)
The non-contact safety switch CET.-AS consists of three components: coded actua-
tor (transponder), evaluation unit and read head. The evaluation unit is integrated
into the switch housing with the read head.
Each actuator possesses a unique electronic coding and so is a unique element in
the system used. The code in an actuator cannot be reprogrammed.
Unlike systems with unique code detection, on multicode devices a specific code
is not requested but instead it is only checked whether the actuator is of a type
that can be detected by the system (multicode detection). There is no exact com-
parison of the actuator code with the code defined in the safety switch (unique
code detection).
The safety switch with integrated evaluation unit and read head is fastened to the
fixed part of the safety guard.
The actuator attached to the movable part of the safety guard is moved towards
the read head fitted in the safety switch 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.
If the actuator is above the extended lift tappet, the door is closed and the half-
sequence is sent via the AS-Interface bus (state: safety guard closed, guard locking
not active).
The code sequence is sent via the AS-Interface bus when the actuator is inserted
into the recess (state: safety guard closed, guard locking active).
The bit sequence 0000 is sent via the AS-Interface bus when the safety guard is
opened.
Lift tappet
Slide
Transponder
Spring-
mounted
guard
locking pin
Recess