Siemens SIMATIC PCS 7 Operation And Maintenance page 79

Restrictions
Which parameters cannot be changed during operation of an H system (selection for typical
PCS 7 projects)?
● CPU: Activation of process image partition
● CPU: Size of maximum local data requirements
● Setting for time synchronization
● Transmission rate to the DP master systems
● Settings on the Ethernet CP and PROFIBUS CP
● Changing the I/O addresses
Checking the plant status
The following requirements must be met prior to making the changes:
● The H system is in "Redundant" system mode.
● All redundant DP slaves are ready for the upcoming master/standby switchover; in other
words, no redundancy errors are pending on the H system or other errors on the interface
module.
Note
If a fault is pending on an interface module, the master/standby switchover will cause the
system to indicate a station failure of the DP slave concerned when the configuration is
downloaded in RUN.
As of PCS 7 V7.0 SP2, related problems with the signal modules concerned are resolved
automatically as soon as the configuration change is active.
With older PCS 7 versions, the ACC input must first be set on the MOD_D1 driver blocks
concerned to ensure that these problems will be resolved.
● All changes must be downloaded via HW Config using "Download station configuration in
RUN mode". The "Compile and download objects" function in SIMATIC Manager cannot
be used for this purpose.
Compendium Part D - Operation and Maintenance (V9.0)
Operating Manual, 02/2018, A5E43228948-AA
AS and OS expansions
7.1 Changes to the AS configuration
79