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Licensing Audit and Compliance Management for Mixed PCS 7 and CFC Versions in Enterprise Plant Architectures

Licensing Audit and Compliance Management for Mixed PCS 7 and CFC Versions in Enterprise Plant Architectures

In multi-generation industrial facilities operating mixed SIMATIC PCS 7 versions, managing licenses across Automation License Manager (ALM) requires strict adherence to Siemens downward compatibility rules. A higher-version license (such as SIMATIC STEP 7 CFC V9.0) legitimately authorizes older software installations (such as CFC V8.1 or V8.0) without audit non-compliance, license conversion, or supplemental licensing fees. To pass formal software compliance audits, enterprises must retain original Certificate of License (CoL) documentation for every license key, maintain a centralized ALM network license server running the latest ALM release, and ensure the total concurrent software instances do not exceed purchased entitlements. Validate procurement options with an authorized Siemens distributor or the Siemens Industry Mall.

Table of Contents

Executive Summary

Large industrial enterprises operating continuous production facilities rarely upgrade all process units simultaneously. Consequently, automation departments routinely maintain a heterogeneous fleet of Engineering Stations spanning PCS 7 V8.0, V8.1, V8.2, and V9.0. When purchasing software maintenance contracts or modern engineering packages, plants receive modern CFC V9.0 licenses. Corporate IT and external auditors frequently flag these installations as non-compliant or mismatched when scanning installed software versions against license keys in Automation License Manager. This guide establishes the legal and technical validity of using newer license keys on legacy software installations, explains ALM audit logging, and details best practices for enterprise license governance.

Architecture and Fundamental Mechanics

Enterprise software licensing in the SIMATIC ecosystem operates through structured compliance layers:
1. Legal Entitlement vs. Technical Authorization:
- Legal Entitlement: Defined by the Certificate of License (CoL) contract. Under Siemens End User License Agreements (EULA), purchasing a license for version $N$ legally conveys the right to operate version $N$ or any previous version ($N-1, N-2$) of the same functional software product.
- Technical Authorization: Enforced by the local ALM service (almsrvx.exe). When CFC V8.1 launches, ALM searches available keys. Detecting a V9.0 license, ALM validates the request because internal cryptographic version check rules permit downward execution.
2. Centralized Floating License Distribution:
In distributed plant networks, dedicated license servers eliminate local workstation license drift. When an engineer launches CFC on an ES virtual machine, the workstation requests a floating license token across TCP port 4410 from the central ALM server. The central server decrements the available pool and logs the borrowing event.
3. Audit Trail and Compliance Verification:
During formal ISO or corporate software audits, automated discovery tools scan registry entries and ALM storage (AX NF ZZ). Mismatches between installed software versions (e.g., s7cfc.exe 8.1) and license key versions (CFC 9.0) are fully compliant under Siemens licensing terms, provided an active CoL exists and the total concurrent usage does not exceed the purchased key quantity.

Step-by-Step Implementation Procedure

  1. Inventory Installed Software and Active Licenses:
    a. On each Engineering Station, open SIMATIC Manager and navigate to Help -> About -> Installed Software.
    b. Export the inventory table listing exact software builds (e.g., CFC V8.1 SP1, Step 7 V5.5 SP4).
    c. Open Automation License Manager on each machine and export the active license list (File -> Export).

  2. Establish Centralized Enterprise License Server:
    a. Deploy a dedicated, high-availability Windows Server VM to host the central license repository.
    b. Install the latest build of Automation License Manager (V6.0 SP9 or newer).
    c. Transfer all modern and legacy license keys (CFC V9.0, STEP 7 V9.0, WinCC V7.5) to the server's local hard drive.

  3. Configure Client Workstations for Network Licensing:
    a. On each engineering client (VM or physical IPC), open ALM.
    b. Select Edit -> Connect Computer and enter the IP address or DNS name of the central license server.
    c. Under File -> Settings -> Connection, verify that port 4410 is open and communication is healthy.
    d. Client machines will now pull required license tokens dynamically during engineering tasks.

  4. Prepare Software Compliance Audit Dossier:
    a. Compile digital Certificate of License (CoL) PDFs obtained from Siemens Online Software Delivery (OSD).
    b. Map each CoL 20-digit license number to its corresponding product line in ALM.
    c. Include Siemens official documentation certifying that version $N$ licenses cover legacy version execution.
    d. File the documentation in the plant automation quality management system.

Verification

  1. Launch CFC V8.1 on an engineering workstation: verify that the application opens cleanly without missing license warnings.
  2. In the central ALM server, inspect the 'Occupied' column for CFC Version 9.0: confirm it increments by 1.
  3. Close CFC on the workstation: confirm the occupied count decrements back to 0 on the server.
  4. Run the ALM license check (License Key -> Check): verify that all keys report 'OK' with green checkmarks.

Limitations and Operational Precautions

Floating license borrowing over high-latency WAN connections or unrouted subnets can cause licensing timeouts; ensure robust Terminal Bus LAN connectivity (port 4410) between engineering clients and the central ALM server.

Engineer FAQ

Does using a CFC V9.0 license on CFC V8.1 violate Siemens licensing terms?

No. Siemens EULAs explicitly permit using newer version license keys to authorize older software releases of the same product.

What evidence satisfies software compliance auditors regarding mixed versions?

A valid Certificate of License (CoL) for the higher version, ALM license check logs, and official Siemens backward-compatibility documentation.

Can an older ALM software release read newer V9.0 license keys?

No. The Automation License Manager software itself must be updated to a version equal to or newer than the newest license key installed.

What port must be open for centralized network licensing in ALM?

TCP Port 4410 must be open through firewalls between engineering clients and the license server.

Can I upgrade an existing legacy license to V9.0 instead of buying a new full license?

Yes, Siemens offers Upgrade Licenses (UG) at significantly reduced cost compared to purchasing full new licenses.

Technical References

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Related Tags

  • Software Licensing
  • Compliance Audit
  • Automation License Manager
  • CFC
  • Enterprise Governance
  • ALM
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