Automatic Voting - Siemens SICAM AK Manual

Redundancy via SCA-RS
•
In the OPM system technique select Redundancy buffer under the node Redundancy
below the M-CPU:
The redundancy buffer is used to avoid the loss of data during the occurrence of an
error/failure until the redundancy switchover is complete.
Column name/
Parameter
Global enabling
Buffer size
Buffer time
The parameter group Redundancy buffer is also available on the CP-2017/PCCX25.
The following parameter groups are identical with those on the C:CPU:
•
Address of the redundant BSE
•
Synchronization parameters
•
Singular Ax-PEs
Refer to section
1.2.3.2

Automatic Voting

Every system has 15 priority levels (0 to 14), whereby 14 is the highest level.
The Voter evaluates both redundancy systems based on the defined number and the priority
levels. The Voter interprets the subsystem with the higher priorities as the faulty one and
switches over to the other system.
You define the criteria for a Voter switchover!
(The priorities can also be defined with the help of CAEx plus, according to the requirements
of your total system.)
The Voter compares the statuses of both systems, by starting from the highest priority
level 14. If both systems have the same status, the Voter compares both systems based on
the next lower priority level.
34
Description/Value
disabled
enabled
Maximum number of process information
items, that can also be stored in the Buffer
time.
Maximum time, during which the process
information items should also be stored.
1.4, Parameter Setting of the
Unrestricted
1-32000
1-255 Seconds
CP-2017/PCCX25.
SICAM RTUs, SICAM AK Redundancy
Edition 10.2016, DC2-026-2.07
Comment