Compiling And Downloading In Stages - Siemens SIMATIC PCS 7 Configuration Manual

Changing projects in process mode
11.1 Downloading changes online
11.1.1

Compiling and downloading in stages

Procedure
1. Compile the S7 program in the CFC or SFC editor or in the plan directory of the component
view. It makes no difference whether the "Changes only" or "Entire program" option is
selected in terms of the AS's capacity to download changes.
2. Download the S7 program into the AS, which is in the RUN-P state, using the "Changes"
option.
3. Compile the OS project of the master OS, using the "Changes only" option. This setting
also ensures that the server data corresponding to the OS is updated automatically.
4. Download the OS project from the ES to the servers.
Once the OS runtime is activated on the target station the "OS-Download" dialog box offers
the option of downloading the changes.
When downloading changes to a redundant OS server pair, the function first downloads
the changes to the configured standby OS. Once this procedure has been executed in full
and confirmed with "OK", the process of downloading changes to the configured master
OS is started. This order is observed regardless of which of the two OS servers is currently
configured as the master.
Note
The steps described should be performed promptly to ensure that no inconsistencies arise
for operators between the time when the AS is changed and the time when the OS is
changed. Operating staff should also be informed of any pending changes.
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Compendium Part A - Configuration Guidelines (V8.2)
Configuration Manual, 08/2016, A5E38166869-AA