TIA Portal V15: Fix Inactive WinCC Professional Download Button

TIA Portal V15 WinCC Professional: Resolving the Inactive Download Button

The WinCC Professional download button in TIA Portal V15 becomes disabled when no target device is selected in the project tree. The fix requires selecting the PC system or the WinCC Runtime entry, verifying OS and TIA Portal version compatibility, and confirming the user has administrative rights on the engineering station. This reference walks through the full diagnosis, root cause, resolution path, and verification procedure.

1. Problem Description

The reported symptom is straightforward: an engineer opens a TIA Portal V15 project that contains a WinCC Professional station, navigates to the Runtime generation menu, and observes that the Download button is grayed out (inactive). Typical report phrasing:

• "The Download button is not active when I want to generate the WinCC Professional V15 Runtime file."
• "Download to device is greyed out for the HMI Runtime / PC System."
• "Cannot compile and download WinCC Professional RT — no action available."

The Runtime compilation either silently refuses to start, or the project is compiled but no transfer dialog is offered. This blocks commissioning, prevents the engineer from pushing the visualization onto the target PC, and breaks the engineering workflow for any project that depends on WinCC Professional.

2. Affected Software and Versions

The following table summarizes the TIA Portal / WinCC Professional versions where this symptom has been documented and the corresponding update paths.

3. Root Cause Analysis

The grayed-out Download button is a user-interface guard, not a software fault. TIA Portal V15 disables the Download-to-device action unless the active selection in the project tree corresponds to a downloadable device — a SIMATIC PLC, an HMI panel, a drive, or a PC system with a WinCC Runtime. The most frequent root causes are:

1. No device selected in the project tree. The project tree (the left navigation pane of the TIA Portal) shows the project structure. Clicking the white background of the tree, the project name, or a folder removes the active download context. Only when a leaf node representing a device (for example, PC-System_1 [WinCC RT Professional] or HMI_RT_1) is highlighted does TIA Portal enable the Download button.
2. The PC system is not configured as a WinCC Runtime target. A Windows PC can be added to the TIA Portal project in several roles (IO controller, IO supervisor, or PC station). If the PC station is missing the WinCC RT Professional slot, the Download action has no valid target.
3. Project compatibility mismatch after upgrade. When a project is upgraded from an older TIA Portal version (V13 SP1, V14) to V15, certain operator panels or PC station configurations may be flagged as not supported in this version. The project compiles, but the unsupported device remains and the download cannot proceed cleanly. See the Siemens support note on TIA Portal V15 upgrades for device compatibility matrices.
4. Insufficient user rights. TIA Portal requires local administrative privileges to enumerate PC interfaces, open PG/PC interfaces, and to write to the Runtime installation directory. If the engineer account is missing admin rights, the Download button is suppressed to prevent partial transfer.
5. OS / TIA Portal mismatch. TIA Portal V15 supports a defined set of Windows operating systems. Running V15 on an unsupported Windows build (for example, an unlisted Windows 10 build or a Windows Server SKU) can disable the download path silently.

4. Preconditions and System Requirements

Before attempting any download from TIA Portal V15 with WinCC Professional, confirm the following prerequisites.

4.1 Operating System Compatibility

TIA Portal V15 (engineering) and WinCC Professional V15 RT (runtime) are validated against the operating systems listed below. The engineering station and the runtime PC can differ; each must satisfy the corresponding row.

4.2 Software Prerequisites

• TIA Portal V15 (DVD: 6ES7822-0AA05-0YA5 or successor media) with the latest Update installed. Check Help → About to read the exact installed build (e.g., V15.0 + Update 4, V15.1 + Update 6).
• SIMATIC WinCC Professional V15 — installed as a product of the same TIA Portal media.
• WinCC Professional RT license key on the target PC (single-station, multi-station, or distributed system variant).
• Microsoft .NET Framework 4.6.x or 4.7.x runtime components (installed by TIA Portal setup).

4.3 User Rights

The engineering user must be a member of the local Administrators group on the engineering PC. The runtime service account on the target PC must have:

• Log on as a service right.
• Write access to %ProgramFiles%\Siemens\Automation\WinCC RT Professional (default install path).
• Read/write access to the project directory (default: %ProgramData%\Siemens\Automation\WinCC RT Professional).

5. Step-by-Step Resolution

Follow this procedure in order. Each step addresses one of the root causes listed in section 3.

Step 1 — Verify TIA Portal version and installed updates

1. Launch TIA Portal V15.
2. From the menu bar, select Help → About (or Help → Information about).
3. Read the Product field (must show TIA Portal V15 or V15.1), the Version (e.g., 15.0.0.0), and any Installed updates.
4. Compare the build number against the official Siemens Industry Online Support release notes for the corresponding Update level.

Step 2 — Validate the project tree selection

1. In the project tree, expand the entry that contains the PC station or HMI Runtime (typically under the project name → Devices & networks).
2. Click the PC system (e.g., PC-System_1) or the WinCC RT Professional leaf. The selected item is highlighted in blue.
3. Look at the toolbar — the Download to device button (icon: arrow pointing down into a device) should now be active.
4. If the toolbar is still greyed, expand the device further and click the WinCC RT Professional sub-node.

Step 3 — Confirm a valid PC station configuration

1. Open Devices & networks in the project tree.
2. Double-click the PC station. The device view opens.
3. Inspect the rack slots:

Slot 2 must contain WinCC RT Professional. If the slot is empty, drag the WinCC RT Professional object from the hardware catalog (under PC systems → SIMATIC HMI → WinCC RT Professional) into slot 2.

Step 4 — Address project-upgrade compatibility errors

If the project was originally created in TIA Portal V13 SP1 or V14 and then upgraded, perform the following check:

1. Compile the project (Project → Compile all → Software (rebuild all)).
2. Open the Inspector → Info → Compile tab. Search for messages of the form "The device [XY] is not supported in this version."
3. For every unsupported device flagged during upgrade, follow the resolution described in Siemens support entry 109754931 — typically by removing the obsolete panel, replacing it with a V15-supported equivalent, or restoring the original project from backup if the upgrade is not strictly required.

Step 5 — Confirm administrative rights

1. On the engineering PC, open Control Panel → User Accounts → Manage User Accounts and verify that the current user belongs to the Administrators group.
2. On the target PC, open Computer Management → Local Users and Groups → Groups → Administrators and confirm the runtime service account is present.
3. Right-click the TIA Portal shortcut and select Run as administrator to bypass any UAC-related permissions issue during the first download attempt.

Step 6 — Configure the PG/PC interface

1. Open the Windows Control Panel and launch Set PG/PC Interface (Start → Siemens Automation → Set PG/PC Interface).
2. For a TCP/IP download, set the access point S7ONLINE to the network adapter connected to the target.
3. For PROFIBUS, set the access point to S7ONLINE (PROFIBUS) and select the correct CP (e.g., CP 5611, CP 5622).
4. Click OK to commit. Restart TIA Portal so the change is picked up.

6. Project Tree Navigation in TIA Portal V15

The project tree is the canonical entry point for every compile, download, and diagnostics action. Engineers should know the structure to avoid the selection pitfall described above.

A common engineering mistake is to leave the focus on the project name after switching tasks. The download button is therefore disabled until the engineer re-clicks the target device. Use Ctrl+Shift+B (the default keyboard accelerator for Build) only after the correct device is selected.

7. WinCC Professional V15 Runtime Configuration

WinCC Professional Runtime on a PC station is configured through the PC System editor inside TIA Portal. The key configuration tabs are:

For a single-station WinCC Professional Runtime, the configuration of the PC station in TIA Portal is the only configuration required on the engineering side. The Runtime is then pushed to the target PC by the Download-to-device action.

8. WinCC Professional V15 Download Procedure

Once the project tree selection and prerequisites are correct, perform the following download sequence. The procedure is documented in the SIMATIC WinCC Professional Engineering V15 manual.

1. In the project tree, click PC-System_1 or the WinCC RT Professional slot to make the Download button active.
2. From the menu bar, select Online → Download to device, or click the toolbar Download button.
3. In the Extended download dialog, choose the Type of the PG/PC interface (e.g., PN/IE for PROFINET/Ethernet) and the PG/PC interface (e.g., the network adapter with the S7ONLINE access point).
4. Click Search to discover compatible nodes on the subnet, or enter the target IP address manually.
5. Select the target PC in the list. Confirm the device flashes / responds to the search by inspecting the device status icon.
6. In the Download preview dialog, review the actions to be performed (e.g., Replace WinCC RT Professional configuration).
7. Click Download. The transfer takes from a few seconds to several minutes depending on the project size.
8. Confirm the Result of the download action in the Inspector / Info tab. Look for "Download to device completed without error".

9. Verification

After the download completes, perform the following verification steps to confirm the WinCC Professional Runtime is operational on the target PC.

1. Open WinCC Explorer on the target PC. The project should be listed under Active project.
2. Activate the Runtime (menu File → Activate Runtime or via the desktop shortcut WinCC RT Professional Start).
3. Confirm that the configured start screen appears.
4. Open the Diagnostics view in WinCC Runtime and check for connection state, tag values, and alarm log.
5. On the engineering station, re-open TIA Portal and check Online → Online & diagnostics for the device; the state should read Online / RUN for the PLC and Online / Runtime active for the HMI Runtime.

10. Troubleshooting Matrix

The matrix below maps the most common symptoms encountered when the Download button is inactive or the transfer fails after activation.

11. Best Practices to Prevent the Issue

• Always select the target device first. Train the engineering team to click the device in the project tree before pressing any Download action — this is the single most effective guard against the greyed-out button.
• Keep a clean device view. Remove obsolete HMI panels and unused PC stations before project upgrades. Each removed device eliminates a candidate for an upgrade-time compatibility error.
• Document the build. Store the TIA Portal version, Update level, and Windows version in the project documentation. This makes future troubleshooting straightforward.
• Use a TIA administrator account. Create a dedicated engineering account with local admin rights and a fixed home directory. This prevents permission drift.
• Update the Automation License Manager on the target PC to match the engineering PC.
• Validate after every upgrade. Run a full compile and a smoke-test download after upgrading a project to a new TIA Portal version, even if the project appears to migrate cleanly.

12. Field-Proven Caveats and Edge Cases

• Multi-monitor runtime: A WinCC Professional Runtime that targets multiple monitors may appear to have the Download button active on the root PC station, but the transfer only succeeds when the WinCC RT Professional slot is selected. The same selection rule applies to single-monitor runtimes.
• Distributed systems with multiple PCs: Each PC station must be downloaded separately. A greyed-out button for PC_2 may be caused by the active selection being PC_1, not by any failure on PC_2.
• Antivirus interference: Some endpoint protection suites (notably Trend Micro, Kaspersky, and Sophos) interfere with the SIMATIC automation ports. Add the TIA Portal installation directory and the WinCC RT directory to the antivirus exclusion list.
• VPN or remote access: When the engineering PC connects to the target over a VPN, the broadcast-based node search may fail. Enter the target IP manually in the Extended download dialog.
• Visual Studio shell components: TIA Portal V15 is built on a Visual Studio 2015 shell. If a custom Visual Studio extension crashes the shell, the Download button may be hidden behind a non-modal dialog. Clear pending modal dialogs and re-try.
• Corrupt project file: On rare occasions, a project that is technically valid but internally corrupted (e.g., a missing tag reference) disables the Download button until the corruption is resolved. Run Project → Compiler → Software (rebuild all) to surface the corruption.

13. Related Standards and Documentation

• SIMATIC WinCC Professional V15 — Engineering Manual (entry 109773506)
• Siemens Support: "The device [XY] is not supported in this version" after upgrading to TIA Portal V15+ (entry 109754931)
• SIMATIC TIA Portal V15 Readme — installation prerequisites and known issues (available via Siemens Industry Online Support)
• PROFINET Installation Guideline (PNO document, referenced by the WinCC Professional installation manual)

14. FAQ