Read-back prior to complete download
If the parameters for a controller are changed in OS runtime, for example, they are written
directly to the AS. If a complete download is made from the ES, the parameters changed on
the OS will be overwritten by the ES. A prompt appears therefore before a complete download
asking if you want to read back the parameters from the AS to the ES.
It is recommended that only parameters changed by the OS (or other communication partners
if applicable) should be read back. This can be selected via the "Operational and observable
parameters" option. If the "All parameters" option is activated, the entire current program state
of the AS is read back, including the status of the logic. This may lead to undesired program
states and, as a result, plant states during subsequent complete downloads.
Compiling and downloading
9.2 Downloading the user program
Compendium Part A - Configuration Guidelines (V8.2)
Configuration Manual, 08/2016, A5E38166869-AA 189
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