Caex Plus Program; Singular Ax Pe - Siemens SICAM AK Manual

During an update the following parts of the control are transmitted to the passive CPU:
•
Instance data of all program instances
•
Instance data of all global variable objects
•
Signal process image (excl. system data points)
•
Status process image of the signals
What is synchronized?
•

CAEx plus program

•

Singular Ax PE

1.1.2.1 CAEx plus Program
The start of every single task of the CAEx plus application, which runs on both CPUs, is
synchronized over the HSL.
The exchange of multiple data points between the two CPUs, on which the CAEx plus
application is running, is performed by means of CAEx plus modules, refer to section
Redundancy Control with CAEx
Another kind of synchronization takes place by copying the process image of the CAEx plus
application from the active CPU to the passive CPU. This synchronization is carried out after
the startup or by the user.
The tasks are stopped during this calibration.
Please note, that redundant CAEx plus applications require longer cycle times than one single
application.
1.1.2.2 Singular Ax PE
The connection of one PE to two redundant BSEs is called singular PEs.
The active BSE communicates with the PE. The passive BSE receives information via HSL.
Redundant BSEs are located either inside one AU (CPU-redundancy) or in separate AUs
(=AU-redundancy).
SICAM RTUs, SICAM AK Redundancy
DC2-026-2.07, Edition 10.2016
plus.
Unrestricted
Redundancy via SCA-RS
1.6.3,
17