Adding OS Clients to Legacy SIMATIC PCS 7 V8.0 Plants - License Compatibility and Ordering Constraints

In legacy SIMATIC PCS 7 V8.0 installations (including CEMAT V8.0 systems), software runtime and client licenses are strictly version-specific. You cannot satisfy license requirements on a PCS 7 V8.0 OS Client using modern PCS 7 V8.2 or V9.x licenses; Automation License Manager (ALM) will flag the license as missing or invalid, triggering recurring demo mode banners and runtime expiration warnings. Because official order numbers for PCS 7 V8.0 OS Client software (6ES7658-2CX08-0YB5) and CEMAT V8.0 Client software (6DL5435-8AX08-0XA0) were discontinued and cancelled in 2019, procurement of legacy licenses requires an active Siemens Legacy System Services (LSS) agreement. Control engineers must contact an authorized Siemens distributor or local Siemens sales branch to obtain discontinued licenses under an LSS contract or plan an operating system and software upgrade.

Executive Summary

Operating plants in chemical, cement, and power industries frequently maintain validated legacy automation infrastructure running PCS 7 V8.0 or specialized industry suites like CEMAT V8.0. When expanding operations by adding a new Operator Station client, engineering teams often discover that standard catalog order numbers have been cancelled and discontinued from the Siemens Industry Mall. Furthermore, attempting to substitute active V8.2 or V9.0 licenses on V8.0 runtime stations fails due to strict major-version license verification within Automation License Manager. Navigating Siemens product lifecycle phases, legacy service agreements, and multi-client licensing rules prevents compliance violations and runtime interruption.

Architecture and Fundamental Mechanics

The licensing verification architecture and product lifecycle mechanics of SIMATIC PCS 7 operate through distinct rules:

Version-Specific License Key Enforcement:
* Siemens Automation License Manager (ALM) strictly checks the internal version signature embedded in each license key (.ekb file).
* For PCS 7 OS Client software, the license signature must explicitly match the installed major software release (e.g., PCS 7 OS Software Client V8.0).
* A newer license key—such as PCS 7 OS Software Client V8.2 or V9.0—does not grant backward compatibility to run older V8.0 software versions unless an explicit downgrade entitlement is defined in specialized enterprise agreements.
* When WinCC Runtime launches on the client, it queries ALM. If only a V8.2 key is present, ALM reports a license failure, switching WinCC into 30-day demo mode.
Siemens Product Lifecycle Phases:
* Active Delivery: Software is readily available for purchase in Industry Mall.
* Product Phase-out: Software remains available as new spare parts for existing plants.
* Product Cancellation / Discontinuation: Standard manufacturing and ordering are halted. Direct ordering of cancelled order numbers (6ES7658-2CX08-0YB5 and 6DL5435-8AX08-0XA0) is blocked in standard sales channels.
Legacy System Services (LSS) Procurement Mechanism:
* To support continuous plant operations without forcing costly and risky plant shutdowns for full upgrades, Siemens provides the Legacy System Services (LSS) framework.
* Under an active LSS contract, Siemens maintains reserved inventory of legacy software authorizations and can issue official legacy licenses for discontinued platforms.
CEMAT Industry Suite Licensing Structure:
* CEMAT introduces an additional operational software layer on top of standard PCS 7.
* Adding a CEMAT OS Client requires two distinct licenses on that specific client station:
1. Standard SIMATIC PCS 7 OS Software Client V8.0 license.
2. SIMATIC CEMAT OS Client V8.0 license.
  * Both licenses must match the V8.0 release family.

Step-by-Step Implementation Procedure

Follow these procedures to evaluate, procure, and install legacy OS Client licenses for a PCS 7 V8.0 / CEMAT plant:

Audit Existing Installed Software and Licenses:
* On an existing operating OS Client, open Automation License Manager (ALM).
* Review installed licenses under the local drive (C:).
* Document the exact license names, versions, and order numbers:
- SIMATIC PCS 7 OS Software Client V8.0 (order number 6ES7658-2CX08-0YB5).
- SIMATIC CEMAT OS Client V8.0 (order number 6DL5435-8AX08-0XA0).
Verify That Newer Licenses Cannot Satisfy V8.0 Runtime:
* Confirm with plant management that purchasing off-the-shelf V8.2 or V9.0 licenses will not work on the existing V8.0 installation.
Engage Authorized Siemens Sales via LSS Contract:
* Contact your local Siemens representative or authorized distributor.
* Inquire about establishing a Siemens Legacy System Services (LSS) contract for your plant facility.
* Under the LSS framework, submit a formal request for the required discontinued V8.0 client licenses.
* Request official authorized distributor quotation and validation for the specific license package schedule.
Evaluate Migration and Upgrade Feasibility:
* Compare the cost and operational life of maintaining legacy V8.0 via LSS versus executing a controlled plant modernization to a supported release (e.g., PCS 7 V9.1).
* Note that PCS 7 V8.0 runs on operating systems (such as Windows 7 / Windows Server 2008 R2) that have reached end-of-support by Microsoft, presenting cybersecurity vulnerabilities.
Install and Activate Legacy Licenses on New OS Client:
* Once legacy licenses are delivered via Siemens Online Software Delivery (OSD) or physical license USB stick:
* Connect the license carrier to the new OS Client machine.
* Open Automation License Manager.
* Transfer both the PCS 7 OS Client V8.0 and CEMAT OS Client V8.0 licenses to drive C:.
* Launch WinCC Runtime and verify error-free startup.

Verification

In Automation License Manager on the new OS Client, click Check License Key. Confirm that both PCS 7 OS Software Client V8.0 and CEMAT OS Client V8.0 indicate status 'OK' with zero missing license notifications. Launch WinCC Runtime; verify that the project loads without displaying demo mode warning dialogs and that CEMAT faceplates open and operate normally.

Limitations and Operational Precautions

Never attempt to run production operator stations in demo mode, as runtime will terminate automatically after demo expiration. Standard off-the-shelf procurement lists cannot be processed without an active Siemens service agreement once products enter cancelled status.

Engineer FAQ

Can a PCS 7 V8.2 OS Client license activate a PCS 7 V8.0 station?

No. PCS 7 and WinCC licenses are strictly version-dependent; a V8.2 license will not satisfy a V8.0 software installation.

How can a plant procure cancelled Siemens software licenses?

Cancelled licenses must be procured through an authorized Siemens Legacy System Services (LSS) agreement or specialized long-term support contract.

What two licenses are required for a CEMAT OS Client?

A CEMAT OS Client requires both the standard PCS 7 OS Software Client license and the CEMAT OS Client license.

Does adding an OS Client require changes to the AS controller?

No. Adding an OS Client only requires generating and downloading server data packages from the OS Servers and configuring the client in the PCS 7 multiproject.