206 • 4-Series™ Control Systems Product Manual — Doc. 8559B
Manifest File Code Flow
The code flow of the auto update mechanism using the manifest file, as performed by the
control system, is described below:
1. The control system downloads the manifest file at the predetermined day and time.
2. The control system parses the manifest file for applicable actions.
3. The control system verifies that the action is valid for itself and its current state. If not, the
control system skips to step 8.
4. The control system downloads the hash file associated with the given action. If the hash
file matches the hash cached on the control system, the control system skips to step 8.
5. The control system downloads the update file.
6. The control system applies the update file as directed. Retries are defined in the Error
Handling (on page209).
7. The control system updates the local copy of the hash if the update is successful.
8. If more actions are defined in the manifest, the control system returns to step 3.
9. The mechanism ceases once all actions defined in the manifest are completed.
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