Siemens SIRIUS 3RK3 - Teaching the Code Sequences; Code Sequences; Teaching Code Sequences

6.5.6 Teaching the code sequences
6.5.6.1 Code sequences
Code sequences of safety-related AS‑i input slaves
Code sequences are acquired by a safety monitor As soon as the MSS 3RK3 with AS-i interface
detects that at least one safety-related AS‑i input slave requires processing, the monitor
functionality is automatically started. That is possible both during startup and after transmission
of a new con󹪝guration in con󹪝guring mode. Teaching of 8 x 4 bit code sequences is therefore
possible in con󹪝guring mode, safety mode and test mode.
Code sequences of safety-related AS-i outputs
As part of the development of safety-related AS‑i outputs new 7 x-4 bit code sequences have
been added to the 8 x 4 bit code sequences of the safety-related AS‑i input slaves. These code
sequences which uniquely apply to the safety-related AS‑i outputs do not have to be retaught
but are speci󹪝ed for every possible address on the AS‑i bus.
6.5.6.2 Teaching code sequences
To be able to monitor safety-related AS‑i input slaves, they must be made known to the system.
This means that the code sequences of all safety-related AS‑i input slaves located on the AS‑i bus
must be known so that they can be identi󹪝ed as safety-related information on the AS‑i bus. The
process of recording, checking, and storing these code sequences is referred to as "teaching
code sequences."
Determining the actual expanded con󹪝guration on the AS‑i bus and comparing it with the target
con󹪝guration
The actual expanded con󹪝guration on the AS‑i bus can only be determined once the AS‑i master
has completed its power-up phase and all AS-i slaves on the bus have been addressed correctly
and are active. The MSS 3RK3 with AS‑i interface determines all slaves. The list of recognized
safety-related slaves is derived from this information. Finally, a check is made to see whether
matching code sequences exist for all safety-related AS‑i input slaves.
Note
Important requirement
During the teaching process the contacts of the safety-related AS-i input slaves must be closed
at least once to allow the code sequences to be retaught.
If the contacts are not closed, calculation continues in the logic diagram with the substitute
value "0." The current status of the AS-i slaves is displayed in the "Target system" > "Learn ASIsafe
code tables" dialog box in Safety ES.
Once the actual expanded con󹪝guration has been determined, it is compared with the
prede󹪝ned target con󹪝guration. AS-i slaves that were not found or that have been stored with
a non-matching code sequence are calculated in the logic processing with the substitute value
Operation
6.5 Connecting to the AS-i master via AS-Interface
SIRIUS 3RK3 Modular Safety System
208 Equipment Manual, 07/2020, NEB926253002000/RS-AC/006