Can PCS 7 OS Clients Connect to an OS Server Runtime Running on the ES?

An OS Client does not obtain runtime server data merely because an OS project is running locally on the Engineering Station. In a PCS 7 multiuser system, the OS server must generate server data and the clients must be assigned the corresponding server packages; the ES-local OS and the designated server role must match the project architecture. Siemens distinguishes an OS single station from a multiuser OS server/client system, so do not assume a local ES runtime automatically acts as a client-serving OS server.

Understand the single-station versus server/client roles

A local OS Runtime on an Engineering Station can be useful for engineering checks, but a PCS 7 OS Client expects server data from its assigned OS server. Siemens documentation describes generating OS server data and assigning it to each client project. A single-user OS station and a multiuser OS server are different station configurations.

Configure the intended OS server and client packages

Identify the intended OS server computer and confirm the OS project's target computer/path matches that station.
Generate server data for the OS server project using SIMATIC Manager's version-specific OS command.
Assign the generated server data to each OS Client project.
Configure the client's standard server for the required components such as Alarms and SSM, and complete preferred-server settings as appropriate.
Compile, download and test the server and client projects using the matching PCS 7 release procedure.

Temporary ES-hosted server workaround is version-specific

A reply reports a PCS 7 V8.0 workaround using a second ES to configure the Target OS Computer path to the ES-hosted project, regenerate server data, then reassign client packages. The author explicitly was unsure whether this works in later versions. Do not apply that path manipulation to PCS 7 V9.x or newer without Siemens documentation and a recoverable test copy.

Test the local OS without changing the client architecture

If the goal is only to test an OS project before downloading to the designated OS server, run the OS locally as a single-station/engineering test where supported. Do not expect production OS clients to see its runtime data unless it is configured and supported as their server.

Verification

Confirm each client project lists the correct server package and standard-server mapping. Start the designated server Runtime, then verify client alarm/data access and server connectivity. A local ES runtime starting successfully does not prove that client packages are generated or assigned.

Limitations and Operational Precautions

The ticket does not identify the PCS 7 version for the workaround question. The workaround is only reported successful on PCS 7 V8.0 and its author could not confirm newer versions. Changing Target OS paths or deleting/reassigning packages can disrupt client/server configuration; back up the multiproject and validate on an isolated copy.

Engineer FAQ

Can clients connect to any OS project running on the ES? No. The client needs server data generated and assigned from the configured OS server project.

What does an OS Client require? An assigned OS server package and correct server/component configuration.

Is an ES-hosted OS always a server for clients? No. Local single-station runtime and multiuser server roles are distinct.

Can I use the reported second-ES workaround on V9.1? Not without version-specific confirmation; it was reported for PCS 7 V8.0 only.

How do I test the client connection? Start the designated server and verify the client's assigned packages, standard server, alarms and live data.

Technical References

Siemens, CEMAT Engineering Manual V7, server data generation and OS client server assignment: https://support.industry.siemens.com/cs/attachments/28286757/Engineering_en.pdf
Siemens, PCS 7 Standard Architectures V9.1, OS server/OS client system role examples: https://support.industry.siemens.com/cs/attachments/109805551/109805551_PCS_7_Architectures_V91_en.pdf
Siemens, PCS 7 Operator Station V9.0 SP1 Configuration Manual, Target OS Computer path configuration: https://support.industry.siemens.com/cs/attachments/109754982/ps7phosb_en-US.pdf