Download PCS 7 V9.0 SP1 OS Changes to a Redundant Server Pair
For a PCS 7 V9.0 SP1 redundant OS pair, the system downloads changes to the configured standby first and then the configured master. A runtime role change does not require manually reversing that sequence. Confirm the configured partner assignment, ensure both servers meet the changes-only preconditions, and follow the download prompts for each partner.
Table of Contents
- The configured standby is downloaded first
- Run the changes-only download
- Distinguish configured roles from current runtime state
- When changes-only is unavailable
- Verification
- Limitations and Operational Precautions
- Engineer FAQ
- Technical References
- Related Articles
- Related Tags
The configured standby is downloaded first
For a redundant PCS 7 OS pair, the changes-only download sequence is handled by the system: the configured standby OS is downloaded first, followed by the configured master. You do not manually reverse the sequence just because the runtime master/standby roles have changed. The download order is based on the project's redundant-server configuration.
Run the changes-only download
- Confirm both redundant OS partners are online and in process mode as required for a changes-only download.
- In SIMATIC Manager, select the configured OS pair/project and open
PLC > Download. - Select the changes-only option if it is available; if it is unavailable, check whether a full download is required by the recent configuration changes.
- Start the download and allow PCS 7 to process the configured standby first, then the configured master. Acknowledge each completion prompt and monitor the download log.
- Verify both servers return to their intended redundant roles and synchronize.
Distinguish configured roles from current runtime state
A redundant pair has a configured master/standby assignment and a runtime state that can change after failover. Do not assume that a temporary runtime switchover changes the project's configured partner assignment or the download order. If the engineering configuration itself was changed, confirm the assigned standby/master paths in SIMATIC Manager before downloading.
When changes-only is unavailable
The changes-only option can be unavailable after project modifications that require a full OS compilation/download or when its preconditions are not met. Follow the installed PCS 7 V9.0 SP1 Operator Station manual and inspect the OS download dialog rather than forcing a delta download.
Verification
Check the download log for each partner, confirm both OS projects are current, verify redundancy synchronization, and identify which server is master/standby after completion. A successful transfer to one partner does not prove the second partner completed.
Limitations and Operational Precautions
The source is PCS 7 V9.0 SP1. The Siemens guide located describes the same standby-first sequence in PCS 7 V9.1 SP1; use the V9.0 SP1 Operator Station manual for exact dialog and preconditions. Downloads can affect runtime availability; use site change control and verify client connections and redundancy after the operation.
Engineer FAQ
Should I change the download order after a role switch? No manual reversal is required; PCS 7 downloads the configured standby first and then the configured master.
Does “current master” mean the configured master? Not necessarily; runtime failover and configured assignment are separate.
When is changes-only available? When its release-specific preconditions are met, including both partners online.
What if the option is missing? Check whether recent project changes require a full OS download.
Technical References
- Siemens, PCS 7/Open OS Setup Guide, section 8.5.2, states that for redundant servers the configured standby is downloaded first, followed by the configured master; guide is V9.1 SP1: https://support.industry.siemens.com/cs/attachments/109808849/PCS7_Open_OS_Setup_Guide_en.pdf
- Siemens, Operator Station (V9.0 SP1), Configuration Manual, OS download configuration and target/standby station settings: https://cache.industry.siemens.com/dl/files/982/109754982/att_939410/v1/ps7phosb_en-US.pdf