Why Industry Library V9.0 Setup Rejects an APL V9.1 Installation
An installed APL V9.1 does not, by itself, establish the prerequisite combination for Industry Library V9.0. Siemens provides a conditional route for IL V9.0 SP1 on PCS 7 V9.1 using legacy APL and Basis Library versions and the update path without new functions. Identify the exact IL setup package before changing the station. The reported prerequisite failure is not enough evidence to prescribe reinstalling APL or bypassing setup checks.
Table of Contents
- Separate Product and Component Versions
- Documented Legacy-Library Compatibility
- Assess the Installation Package
- Verification
- Limitations and Operational Precautions
- Engineer FAQ
- Technical References
- Related Articles
- Related Tags
Separate Product and Component Versions
The affected engineering station has PCS 7 V9.1, APL V9.1 and a 64-bit Windows 10 Enterprise LTSC installation. Industry Library V9.0 setup reports that its APL prerequisite is missing.
That observation does not establish a damaged APL installation. First record the precise Industry Library package being installed: the V9.0 full product, an update and V9.0 SP1 are different installation inputs. Also record the exact APL, Basis Library and PCS 7 updates and the Windows LTSC release.
Documented Legacy-Library Compatibility
The opened IL V9.0 SP1 readme, A5E50248324-AC, sections 3.3–3.4, approves its use with PCS 7 V9.1 under two conditions:
- The project follows Software update without utilization of new functions.
- APL and Basis Library are at least V9.0.3 Update 4.
This is a conditional legacy-library route. It does not establish that APL V9.1 satisfies the prerequisite of every IL V9.0 installer, or that PCS 7 V9.1 SP1 is covered by the same approval. The reply's later Update 6 recommendation is not the minimum stated in this opened readme.
Assess the Installation Package
The readme distinguishes the full installation from update/service-pack installation: an update or service pack checks for the full V9.0 product and terminates if it is absent.
For a reviewed installation plan:
- Preserve the station image, project and master library.
- Identify the exact setup package and whether its required full product is already installed.
- Choose the intended project path: retain legacy-library functionality or move to a separately verified newer library combination.
- For the legacy SP1 route, compare the project migration method and both library versions with the documented conditions above.
- Resolve the exact base-installer prerequisite and installation order before running setup again.
Steps 1 and 3–5 are engineering assessment, not a manufacturer-proven fix for the displayed prerequisite error. Do not bypass setup checks or edit installation detection data.
Verification
A valid result needs more than a successful installer exit. Record the installed IL, APL and Basis Library versions and compare them with the approved combination and project migration path.
In a project copy, inspect the required library blocks and OS components, then follow the applicable update instructions for any project change. Installing software and updating a project's block types are separate operations. Neither authorizes a live controller download.
Limitations and Operational Precautions
The exact V9.0 base setup detection rule and a verified installation sequence for the affected station remain unresolved. The proposed sequence of installing APL and Basis Library after IL was not independently established in the opened readme and is not prescribed here.
The historical discussion includes a claim about IL V9.0 SP3 that cannot be substituted for the documented IL V9.0 SP1 product. Preserve those version distinctions. Do not remove working libraries or change OS runtime components until the complete supported installation and rollback plan is established.
Engineer FAQ
Does a higher APL number guarantee compatibility?
No. The readme makes the IL/APL combination version-specific.
Can IL V9.0 SP1 be considered for PCS 7 V9.1?
Yes, subject to the stated migration and library conditions.
Is this approval automatically valid for PCS 7 V9.1 SP1?
That extension is not established by the opened conditions.
Technical References
- Siemens: PCS 7 Industry Library Readme V9.0 SP1 (online), A5E50248324-AC — sections 3.3–3.4, pages 10–12. The manufacturer PDF was downloaded and read; its conditional PCS 7 V9.1 approval is used explicitly.