Operating Instructions
Transponder-Coded Safety Switch CTM-L2-AS1B
8
(translation of the original operating instructions) 2539116-02-09/21
6. Function
The device permits the locking of movable guards.
The system consists of the following components: coded actuator (transponder) and switch.
Whether the device learns the complete actuator code (unicode) or not (multicode) depends on the respective version.
Ì
Devices with unicode evaluation
: The actuator must be assigned to the safety switch by a teach-in operation so that
it is detected by the system. This unambiguous assignment ensures a particularly high level of protection against tam-
pering. The system thus possesses a high coding level.
Ì
Devices with multicode evaluation
: Unlike systems with unicode evaluation, 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 (multi-
code detection). There is no exact comparison of the actuator code with the taught-in code in the safety switch (unicode
evaluation). The system possesses a low coding level.
When the guard is closed, the actuator is moved into the safety switch. When the operating distances are reached, power
is supplied to the actuator by the switch and data transfer begins.
If the guard is closed, guard locking is effective and the coding is permissible, each CTM-AS transmits a switch-specific,
unique safety code sequence with 8 x 4 bits via the AS-Interface bus.
The zero sequence is transmitted via the AS-Interface bus when the guard is unlocked.
In the event of a fault in the safety switch, the zero sequence is transmitted via the AS-Interface bus and the LOCK/DIA LED
illuminates red. The occurrence of faults is detected at the latest on the next demand to close the safety outputs (e.g. on
starting).
6.1.
Guard locking on version CTM-L2
(guard locking actuated by power-ON and released by spring force)
Important!
Use as guard locking for personnel protection is possible only in special cases, after strict assessment
of the accident risk (see EN ISO 14119:2013, section 5.7.1)!
Activating guard locking:
Apply auxiliary power to the solenoid and set AS-Interface output bit D0.
Releasing guard locking:
No auxiliary power at the solenoid and/or clear AS-Interface output bit D0.
The magnetically actuated guard locking operates in accordance with the open-circuit current principle. If the solenoid is
not controlled (D0=0) or if auxiliary power is switched off, guard locking is released and the guard can be opened directly!
If the solenoid is controlled via the ASi bus (D0=1) and auxiliary power is applied to the solenoid, guard locking is activated
and the guard is locked.
