Resolving Inability to Create New Hierarchy Folders in SIMATIC PCS 7 Plant View

In SIMATIC PCS 7, being unable to create a new hierarchy folder in the Plant View—where right-clicking a project or folder shows 'Insert New Object -> Hierarchy Folder' grayed out or clicking it produces no result without an error popup—occurs because the plant hierarchy has reached its configured Maximum Hierarchy Depth limit. By default, STEP 7 configures a fixed maximum level depth (e.g. 3, 5, or 8 levels). When the current folder path reaches this maximum depth, the editor silently prohibits adding child folders. To resolve this, open 'Options -> Plant Hierarchy -> Customize' in SIMATIC Manager, increase the 'Maximum number of hierarchy levels', and adjust the character length allocations per level.

Plant Hierarchy (PH) Architecture and Level Depth Constraints

The Plant Hierarchy (PH) in SIMATIC Manager models the physical and technological structure of an industrial plant (Enterprise -> Site -> Area -> Unit -> Equipment Module):
* Configurable Depth: Under Options -> Plant Hierarchy -> Customize..., STEP 7 allows defining between 1 and 8 hierarchy levels.
* Character Length Limit: Each level is allocated a maximum character string length (e.g. Level 1: 10 chars, Level 2: 12 chars). The total concatenated HID (Higher Designation / AKZ) string has an overall architectural limit.
* Structural Enforcement: If a project was initialized with a maximum depth of 3 levels, attempting to create a 4th child folder fails silently because the software strictly enforces the defined schema.

Root Causes of Disabled Hierarchy Folder Insertion

When an engineer cannot insert a new hierarchy folder:
1. Maximum Configured Level Reached: The target parent folder is already at the maximum configured hierarchy level (e.g. Level 3 of 3).
2. Project Database Lock or Read-Only Mode: If another engineering client has locked the Plant Hierarchy across a multi-user engineering session, folder creation commands are suppressed.
3. Component View vs Plant View Context: Attempting to insert a technological folder while inadvertently focused on the S7 Program or Component View rather than the Plant View.
4. Plant Hierarchy Index Corruption: Mismatched database pointers caused by aborted archives or network glitches, requiring an internal consistency check.

Remediation Procedure - Expanding Hierarchy Depth and Character Allocation

Follow this procedure to expand the hierarchy depth and enable folder creation:

[Phase 1: Adjust Plant Hierarchy Customization in SIMATIC Manager]
   │  • In SIMATIC Manager: Select the Project or Multiproject object
   │  • Navigate to menu: Options -> Plant Hierarchy -> "Customize..."
   │  • In the "Customize Plant Hierarchy" dialog:
   │      - Locate field: "Maximum number of hierarchy levels"
   │      - Increase the value (e.g. from 3 to 5, up to a maximum of 8)
   │  • Review character allocations:
   │      - Ensure each new level has sufficient character length (e.g. 16 characters)
   │      - Verify delimiter (e.g. "/" or "_")
   │  • Click "OK" to apply the new schema
   │
[Phase 2: Check Plant Hierarchy Consistency]
   │  • Select menu: Options -> Plant Hierarchy -> "Check Consistency"
   │  • Confirm zero errors reported
   │
[Phase 3: Insert New Hierarchy Folder]
   │  • In Plant View: Right-click the parent folder
   │  • Select: Insert New Object -> "Hierarchy Folder"
   │  • The folder is created immediately; assign its technological name!

Plant Hierarchy Configuration and Limit Matrix

Review the structural limitations of the SIMATIC PCS 7 Plant Hierarchy:

Hierarchy ParameterFactory Default ValueMaximum Configurable LimitOperational ConsiderationHierarchy Levels3 levels8 levelsDeeper levels increase WinCC tag name lengths.Characters per Level8 to 12 characters24 charactersMust not exceed WinCC tag name max (128 chars).OS Area IdentificationLevel 2 or 3Configurable (1 to 8)Determines operator area access permissions.Picture Hierarchy DerivationEnabledEnabled / DisabledGenerates WinCC Picture Tree automatically.

Verification

To confirm that hierarchy folder creation is restored:
1. In SIMATIC Manager Plant View, right-click the target parent folder.
2. Verify that Insert New Object -> Hierarchy Folder is active and clickable.
3. Click the command; confirm that a new yellow folder icon appears immediately.
4. Rename the folder (e.g. Unit_Reactor_01); verify that the technological path updates.
5. Insert a test CFC chart into the new folder; confirm that the chart inherits the full hierarchical path.

Limitations and Operational Precautions

Never reduce the maximum number of hierarchy levels if child folders already exist below that level; doing so will orphan or delete existing charts and pictures. Increasing character lengths or adding hierarchy levels expands WinCC structure tag names. Always verify that total tag path lengths do not exceed 128 characters, as exceeding this limit causes OS compilation failures.

Engineer FAQ

Why did STEP 7 not show an error message when folder creation failed?

STEP 7 handles maximum hierarchy level boundaries by disabling insertion commands in the context menu rather than raising an interactive error dialog.

Can I move an entire hierarchy folder to a different plant area?

Yes, via drag-and-drop in Plant View. However, this alters the technological path, requiring a CFC compilation and an OS compilation to update WinCC tag prefixes.

What does 'Level for OS Area' mean in the Plant Hierarchy settings?

It defines which hierarchy level corresponds to an operator technological area, establishing the basis for WinCC alarm filtering, user authorizations, and overview buttons.

Can I change the hierarchy delimiter character in an existing project?

Changing the delimiter (e.g. from / to .) after compiling the OS will cause tag mismatches in WinCC. Avoid changing delimiters on live commissioned projects.