C135 PCS 7 (PCS7)
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Diagnosing and Resolving Error 257:94 When Opening SIMATIC PCS 7 Projects on Engineering Stations

Diagnosing and Resolving Error 257:94 When Opening SIMATIC PCS 7 Projects on Engineering Stations

In SIMATIC PCS 7, Error 257:94 ('Project contains objects of software package X which cannot be edited because the software package is not installed') indicates that the Engineering Station lacks one or more required software option packages, hotfixes, or specific library versions utilized in the project. To resolve it, inspect the project's dependencies via 'File > Manage > Required Software Packages' in SIMATIC Manager to identify missing packages (such as S7 F-Systems, SIMATIC BATCH, Route Control, or CFC/SFC updates). Install the missing software components matching the required versions, or perform 'File > Save As... > With Reorganization (Slow)' to clear obsolete database references.

Table of Contents

Executive Summary

When transferring PCS 7 project archives between different Engineering Stations (ES), commissioning laptops, or client sites, automation engineers frequently encounter STEP 7 error dialog 257:94 upon opening the project. While the multiproject structure usually opens, attempting to open individual CFC charts, hardware configurations, or technological hierarchies fails or displays truncated object views. Because error 257:94 stems from a mismatch between the object class definitions registered inside the project database and the software packages physically installed in the Windows OS, resolving the fault requires pinpointing the exact missing component rather than reinstalling the entire engineering suite. This technical guide details the diagnostic steps and database recovery workflows.

Root Causes of STEP 7 Error Code 257:94

Error 257:94 occurs due to three primary operational conditions:

  • Missing Optional Engineering Packages: The original project was authored using optional PCS 7 packages (such as S7 F-Systems, SIMATIC BATCH, SIMATIC Route Control, SIMATIC PDM, or Drive ES PCS 7) that are not installed on the current ES.
  • Version and Service Pack Discrepancies: The project was created or updated with a newer Service Pack or Update (e.g. CFC V8.1 Upd1 vs baseline CFC V8.1), introducing new COM class GUIDs that older DLLs cannot interpret.
  • Orphaned Project References: An optional package was removed or uninstalled from the project, but residual schema pointers remain cached in the project's MS Access / Sybase database tables.

Software Package Class Registry Architecture

SIMATIC Manager utilizes an object-oriented COM/ActiveX architecture. Every technological object (a CFC chart, a safety F-block, an AS-OS connection) registers an associated software package identifier in the project header. When opening a project, SIMATIC Manager scans the Windows Registry under HKEY_LOCAL_MACHINE\SOFTWARE\Siemens\STEP7 to confirm that all registered object handlers are present. If a single class handler is missing, Error 257:94 is triggered.

Diagnostic Matrix for Common Missing PCS 7 Options

The following table lists common software packages associated with Error 257:94 and their operational indicators:

Missing Software PackageTypical Error Dialog IndicatorImpacted Project FoldersRequired Resolution ActionS7 F SystemsMissing package: S7 F Systems LibCFC charts containing F-BlocksInstall S7 F Systems engineering software.SIMATIC BATCHMissing package: BATCH EngineeringRecipe and batch unit hierarchiesInstall SIMATIC BATCH ES package.SIMATIC Route ControlMissing package: Route ControlRC blocks, locations, and routesInstall SIMATIC Route Control ES package.SIMATIC PDMMissing package: PDM Device IntegrationHW Config intelligent field devicesInstall SIMATIC PDM with EDD catalog.CFC / SFC Hotfix DeltaVersion mismatch in object handlerAll CFC / SFC chartsUpdate CFC/SFC to matching Upd / HF release.Orphaned Tool ReferencePackage listed with red crossProject root containerExecute 'Save As With Reorganization (Slow)'.

Step-by-Step Procedure to Diagnose and Resolve Error 257:94

Method 1: Identifying Missing Packages via SIMATIC Manager

  1. Open SIMATIC Manager on the Engineering Station.
  2. When Error 257:94 appears, click OK to allow the project to load in read-only / partial mode.
  3. In the project tree, right-click the root Multiproject (or individual Project) folder and select Object Properties.
  4. Switch to the Required Software Packages tab.
  5. Review the list of components. Any software package displayed with a red cross (X) indicates a missing package.
  6. Note the exact package name and version requirement displayed in the dialog.
  7. Install the missing software package from the original PCS 7 installation media or download the required Update from SIOS.

Method 2: Eliminating Phantom Dependencies via Database Reorganization

  1. If all necessary engineering packages are installed but Error 257:94 persists due to obsolete removed objects:
  2. In SIMATIC Manager, select File > 'Save As...' from the menu.
  3. In the Save As dialog, select a new target directory.
  4. Check the box With Reorganization (Slow).
  5. Click OK. SIMATIC Manager reconstructs all relational database tables, rebuilding cross-references and purging unreferenced package tags.
  6. Open the newly reorganized project and confirm that Error 257:94 no longer appears.

Verification

To verify that project consistency is fully restored:

  1. Clean Project Opening: Close SIMATIC Manager and re-open the reorganized project. Confirm that it opens with zero warning dialogs.
  2. Package Audit: Inspect Object Properties > Required Software Packages. Confirm that all listed packages display green checks.
  3. CFC and HW Config Access: Open representative CFC charts and HW Config stations. Confirm that all blocks, field devices, and interconnections display correctly without grayed-out placeholders.

Limitations and Operational Precautions

  • Safety Projects Require Certified Packages: If the missing package is S7 F Systems, never attempt to bypass or strip the dependency; safety logic cannot be certified or edited without the exact certified F-Systems software version.
  • Reorganization Time Requirements: The 'Save As With Reorganization (Slow)' operation can take over an hour on very large multiprojects; ensure uninterruptible power supply (UPS) protection during this process.
  • Backup Integrity: Always maintain a pristine .zip backup of the raw archive before executing reorganization.

Engineer FAQ

Can I edit CFC charts if I ignore Error 257:94?

If the missing package is not utilized in that specific chart, editing is possible. However, compiling the charts will fail if dependent types cannot be verified.

Does Error 257:94 indicate corruption of the PLC controller memory?

No. The error pertains strictly to the offline Engineering Station database and Windows software installation.

Where can I find the list of software packages installed on my PC?

In SIMATIC Manager, select 'Help > About > Installed Software', then click 'Display' to view all installed packages and hotfixes.

Technical References

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