Siemens SIRIUS 3RK3 Equipment Manual page 213

Error on replacement of a safety-related AS-i slave
During a routine replacement of a safety-related AS-i slave, the yellow-lit TEACH-LED of the
MSS 3RK3 indicates that new code sequences have been detected and can be applied. There are
cases where new code sequences cannot be taught:
• Replacement of a safety-related AS-i slave with a non-safety-related AS-i slave
If a safety-related AS-i slave is replaced by a non-safety-related AS-i slave, this is detected by
the MSS 3RK3 and the substitute value "0" for this AS‑i slave will be retained and the taught
code sequence of the removed safety-related AS-i slave will be deleted.
• Incorrect code sequence when replacing a safety-related AS-i slave
If the replaced AS-i slave sends an incorrect code sequence, it cannot be used. The TEACH-LED
does not light up or flash.
Loss of the safety functions.
Can Cause Death, Serious Injury, or Property Damage.
For safety reasons, the code sequences of all safety-related slaves must be known to every
monitor on the AS‑i bus. If an additional safety-related AS‑i input slave is added to the AS‑i bus,
the code sequence of this slave must be taught or every MSS 3RK3 or safety monitor located on
the AS‑i bus, irrespective of whether or not this new safety-related AS-i slave is monitored by
the corresponding MSS 3RK3 or safety monitor.
Acknowledging a code sequence error
When a new slave with a correct new code sequence has been inserted, the existing code
sequence error must be acknowledged with the RESET button. Only then can the new code
sequence be stored.
SIRIUS 3RK3 Modular Safety System
Equipment Manual, 07/2020, NEB926253002000/RS-AC/006
WARNING
6.5 Connecting to the AS-i master via AS-Interface
Operation
213