Resolving KTP600 Basic PN Program Corruption and Transfer

Problem Definition: KTP600 Basic PN Program Corruption and Transfer Failure

The Siemens SIMATIC KTP600 Basic PN (6 inch, PROFINET) frequently reports a "Programme corrupt" boot error after a WinCC Flexible 2008 SP2 project update, a partial TIA Portal transfer, or an interrupted firmware/backup restore. The unit either refuses to enter Run mode at all, hangs on the splash screen with a red banner, or it boots, but the screen shows white blocks / "???" tags in place of configured objects. A related failure mode is the transfer rejection from WinCC Flexible, TIA Portal, or ProSave, where the engineering station reports "Connection failed" or "HMI device is not responding", although the panel's IP address pings correctly. Both symptoms typically point to a damaged compressed runtime image, a desynchronised internal log database, or a transfer handshake mismatch.

This reference consolidates the field-proven recovery workflow for the KTP600 Basic mono PN (6AV6 647-0AD11-3AX0) and KTP600 Basic color PN (6AV6 647-0AE11-3AX0 / 6AV6 647-0AG11-3AX0) families, with explicit steps for WinCC Flexible 2008 SP2 / SP3 / SP4 / SP5, TIA Portal V13 SP1 through V17, and ProSave V13 / V14. The procedure is independent of the connected PLC family (S7-200, S7-1200, S7-300/400, LOGO!, or third-party controllers), but a warning is included for the well-documented incompatibility between genuine Siemens software and "CN" Chinese cloned S7-200 CPUs that share the MPI/PPI physical layer but use a non-standard firmware loader.

KTP600 Basic PN Hardware Identification

Confirm the exact variant before starting recovery; the image, runtime, and supported engineering toolchain are tied to the article number printed on the rear label.

Power: 24 V DC (20.4 to 28.8 V), 250 mA typical, 500 mA inrush. PROFINET interface: 1 x RJ45, 10/100 Mbit, supports PROFINET IO device, S7 routing, and HMI transfer on TCP/102 and UDP/34964. The Service / X1 port is the same physical connector; PC direct connection uses a standard Cat5 crossover or auto-MDIX switch.

For the canonical product manual refer to the Siemens Industry Online Support entry for the KTP600 Basic PN: SIMATIC HMI KTP600 Basic PN Operating Instructions. The device manual also lists the boot error codes, the meaning of the 'HMI Ready' LED patterns, and the function of the 'CF' / 'MMC' slot (the KTP600 Basic PN does not have a card slot — all data resides in internal flash).

Root Cause Analysis: What Triggers "Programme corrupt"

The "Programme corrupt" message is generated by the WinCC Flexible / TIA Portal runtime (RtxCef or HmiEs) when the integrity check on the project archive fails. The runtime stores the project as a single compressed blob in /active.bck and validates the CRC on every boot. The five root causes that engineers encounter in production environments are:

1. Mid-transfer power loss. The 24 V supply drops below 20.4 V or is removed while the runtime is writing the active image. The CRC is left inconsistent, and the runtime cannot fall back to a usable backup.
2. Cross-version project conversion artefact. A project originally built in WinCC Flexible 2004 is opened in WinCC Flexible 2008 SP2, modified, and re-compiled. Some object serialisations (alarm classes, scheduler, user-defined VB scripts) do not cleanly round-trip across all SPs and produce a runtime that compiles in the editor but fails the integrity check on the panel.
3. Internal log database corruption. The panel maintains *.ldf and *.hmi files inside the compressed project. If the alarm log, audit trail, or recipe database pointer references a tag that no longer exists, the runtime loads the project but marks it corrupt on the next scheduled log flush.
4. Incompatible firmware / image mismatch. ProSave has been used to flash a WinCC Flexible 2008 SP2 image into a panel whose factory image was built for TIA V14. The runtime accepts the transfer (it does not check major version) but the system libraries diverge and the panel flags the program on first start.
5. Third-party or "CN" cloned PLC loader interference. A non-Siemens MPI/PPI download tool (commonly bundled with Chinese clones of the S7-200 CPU 224 XP) opens the same serial port and writes garbage frames to the HMI when the editor auto-detects. The HMI's transfer monitor receives a malformed protocol packet, terminates the transfer mid-stream, and writes a half-complete project.

Distinguishing between (1)–(3) and (4)–(5) is critical: cases (1)–(3) can be recovered in software, case (4) requires a full image re-flash through ProSave, and case (5) requires isolating the HMI from any third-party bus master before another transfer is attempted.

Required Toolchain and Software Versions

ProSave is the lowest-level tool and is the only utility that can re-flash the operating system image of a panel that refuses to enter Run mode. Download paths are maintained in the Siemens Support Portal: SIMATIC ProSave V14 SP1 download entry and the corresponding KTP600 firmware / image repository. Always match the ProSave version to the OS image version: a V14 image cannot be installed with V13 ProSave and will silently drop the transfer with "Error 0x8004F0F1".

Recovery Procedure A: Backup File Restoration (.hmi and .ldf)

When the engineering PC still has the original *.hmi project file but the panel reports corruption, perform a clean restore before recompiling. This is the fastest path and avoids opening the project in the editor at all.

1. Close WinCC Flexible / TIA Portal to release the COM port and shared file lock on the project directory.
2. Open Windows Explorer and navigate to the backup location. The two essential files are <projectname>.hmi (the compressed runtime image that ProSave / transfer expects) and <projectname>.ldf (the internal log database used by the runtime for alarm history, audit, and recipe versioning).
3. Copy both files into a fresh folder, e.g. D:\KTP600_Recovery\. The rename is intentional: it forces the runtime to rebuild the surrounding auxiliary files (*.log, *.bak, *.bin) on next start rather than re-using the suspect pointers.
4. From the Windows command prompt, set the engineering PC IP to the same subnet as the KTP600 (default 192.168.1.100 / 255.255.255.0 on the panel). Verify reachability with ping 192.168.1.100; a reply with TTL < 64 confirms the panel is alive on the PROFINET port.
5. Launch ProSave, select Device type > KTP600 Basic color PN, set Connection > Ethernet, enter the panel IP, and click Restore. Select the renamed .hmi file. ProSave will report "Restore in progress", then either "Restore successful" or a hex error code.
6. After ProSave closes the connection, power-cycle the panel (24 V off for 10 s, then on). The panel should boot into the splash screen and then into the configured start screen within 30–45 s.

Recovery Procedure B: Page-by-Page Rebuild in WinCC Flexible

If Recovery A returns the panel to Run mode but specific screens remain broken (typically: white blocks, missing labels, alarm class unreadable), the corruption is local to one or more pages. Use this surgical procedure to isolate the offending page without rebuilding the entire project.

1. Open the original .hmi in WinCC Flexible 2008 SP2 (use "Open Project / Read from backup" rather than "Open Recent" to avoid pulling the cached version from the registry).
2. From the menu, choose Project > Compiler > Rebuild All. This forces a full re-compilation, regenerates the *.bin cross-reference, and re-validates tag pointer addresses. Many corruption cases introduced by SP upgrades resolve at this step alone.
3. If "Rebuild All" still produces compile warnings on a specific page, copy that page to a clipboard buffer, then delete it from the project. Compile, transfer, and verify. Repeat for each page until the transfer is clean. This is the same procedure used to identify a corrupted .emf or .png embedded graphic.
4. For the page that consistently fails, the most common culprits in 2008 SP2 → SP5 conversions are: Faceplate instances pointing to a renamed structure tag, Symbolic I/O fields bound to a deleted DB bit, and User-defined VB scripts referencing COM objects not registered on the new SP. Strip the page down to a single rectangle with a static text label, transfer, and incrementally re-add objects to localise the offender.
5. Recompile and re-transfer. The .ldf file is regenerated automatically by the runtime; you do not need to copy it back manually.

Recovery Procedure C: Full OS Reload with ProSave

If the panel hangs on the splash screen with "Programme corrupt" and ProSave's Restore operation itself returns an error, the runtime image must be replaced. This is a destructive operation: it erases the active project, the recipe DB, and the alarm log.

1. Confirm the panel is in Transfer mode. On the KTP600 Basic PN, hold the lower-right corner of the touch screen for 5 s during the boot sequence to invoke the Service menu. If touch is unresponsive (firmware 8.x hang), power-cycle and within 3 s of the splash screen tap the top-left corner three times in quick succession — this is the engineering emergency shortcut.
2. Launch ProSave, select Operating System Update, choose the correct .img for the panel variant and firmware (e.g. KTP600_Basic_PN_V14_SP1_HF5.img), and click Update OS. The transfer takes 4–6 minutes on a 10/100 link; do not interrupt.
3. When the OS update completes, ProSave will prompt to transfer a project. Decline and exit. Power-cycle the panel — it should now display the Siemens splash screen without a "Programme corrupt" banner.
4. Open the engineering project in WinCC Flexible or TIA Portal and perform a clean transfer (Project > Transfer > PC > HMI). Watch the transfer log: a healthy transfer shows a contiguous stream of 0x01 0xFB ack frames in the TCP/102 stream; a corrupted transfer drops ack frames and Wireshark will show retransmits.
5. Recreate any persistent recipes or audit data manually — the OS reload does not preserve user data.

The SIMATIC HMI Panel Image Update Center contains the canonical firmware images and a per-variant version matrix. Always use the HF (hotfix) image that matches the highest installed SP of the engineering tool; mixing an SP3 image with an SP5 editor is a common source of post-restore "missing library" warnings.

Recovery Procedure D: Page-by-Page from Scratch (Last Resort)

When the original .hmi is lost and no backup is available, the project must be reconstructed. The technique is identical to Recovery B but starts from an empty project.

1. Create a new project in WinCC Flexible 2008 SP2 with the correct panel type and PROFINET connection. Define the tag interface, alarms, and recipes first — these are the structural backbone.
2. Add pages one at a time. After each page is laid out, perform an incremental compile and a full transfer to the panel. This makes the project "field-proven" page by page and isolates any single page that reintroduces the corruption.
3. For very old projects that have been converted many times across WinCC Flexible 2004 → 2008 SP2 → TIA V13 → V16, the conversion may be lossy. In that case export the original project from the last known-good 2008 SP2 source as a .pnz package, then re-import into TIA Portal V16 with the migration tool. The .pnz format preserves the runtime blob and is more resilient to version drift than the XML exchange format.
4. Tag references that are not visible in the editor can be located using the "Cross-reference" tool (Tools > Cross-reference in 2008 SP2, Project tree > HMI tags > Show usage in TIA). Use this to confirm that all originally bound tags are still present in the PLC project — a missing DB on the PLC side is sometimes misdiagnosed as a panel corruption.

Transfer Troubleshooting: Download Failures to KTP600

When the engineering station fails to download to a previously healthy KTP600, the most common root cause is not the project at all but the transfer channel. Diagnose in this order:

1. IP reachability. ping <HMI_IP> must return < 5 ms on a direct link. Anything above 20 ms suggests a misconfigured switch or a parallel host on the same IP. A duplicate IP on the network is the single most common cause of "Connection failed" with a green ping and a red transfer.
2. Transfer ports open. PROFINET transfer uses TCP/102 and UDP/34964. Open a telnet <HMI_IP> 102 connection — a black screen with no error means the port is open; an immediate "connection refused" indicates a firewall or a panel that has not finished booting.
3. PG/PC interface assignment. In WinCC Flexible, the Transfer Settings > Mode > Ethernet dialog must point to the correct NIC. If a virtual Ethernet (e.g. VMware, Hyper-V, VPN TAP adapter) is selected the transfer silently fails to bind and the editor reports "No HMI device found" after a 30 s timeout. Disable all virtual adapters in Control Panel > Network and Internet > Network Connections before transferring.
4. Transfer mode on the panel. The KTP600 must be in Transfer mode (the "Transfer" menu is reachable from the loader's Start Center or by holding the touch in the lower-right at boot). If the panel is in Offline the editor will fail the handshake. The 6 inch Basic PN does not support a remote "request transfer" flag like the Comfort panels — the operator must set it locally.
5. Project size vs. runtime limit. A compiled .hmi file larger than 1 MB will reject at transfer time with "Project too large". Audit the project size with Project > Properties > Compile > Size estimate and remove unused faceplates, redundant language tables, and oversized bitmaps (the panel does not benefit from any image above 100 KB at 320 x 240).
6. Concurrent MPI/PPI traffic. Disconnect any third-party programming cable (especially those used with "CN" cloned S7-200 CPUs) from the bus before transferring. The cloned loader opens the COM port in raw mode and emits a continuous carrier detect pulse that collides with the HMI's PROFINET discovery frames. The Siemens forum thread "Regarding downloading program to siemens ktp600 Basic PN HMI" documents this exact failure mode in production.

Verification and Commissioning Checks

After any recovery, perform the following structured checks before returning the panel to production:

1. Boot sanity. Power on, time the splash-to-start-screen transition. A healthy panel reaches the start screen in 25–35 s. Anything beyond 60 s indicates a degraded flash or a partially recovered log database.
2. Tag polling. Navigate to a screen that displays an integer counter, force a value change in the PLC using a watch table, and confirm the HMI updates within one PROFINET cycle (typically 4–32 ms for 1 ms update time on the connection).
3. Alarm round-trip. Trigger a configured alarm from the PLC, confirm it appears in the active alarm window, and confirm that the operator's acknowledgement is written back to the PLC's acknowledge tag within one cycle.
4. Recipe persistence. Write a recipe from the panel, power-cycle, and re-read. If the value is lost the internal recipe database is still corrupted and a full OS reload is required.
5. Audit log integrity. Open the Diagnostic > System > Logs page on the panel (or export via ProSave "Backup") and confirm the *.ldf file is consistent with the current configuration. An empty or truncated log file is a sign that Recovery A was incomplete.
6. Touch calibration. Re-run the touch calibration from the loader's Service menu. Some OS reloads reset the calibration to factory defaults.

Prevention: Version Control and Clone PLC Avoidance

• Pin the engineering tool version. A project should be built and transferred with one and only one version of WinCC Flexible or TIA Portal. If a version upgrade is required, use the "Save as > with compatibility for SPx" option rather than letting the editor silently upgrade on open.
• Maintain a project archive. After every successful transfer, commit the .hmi, .ldf, the project tree, and the .pnz export to a version-controlled repository (SVN, Git LFS, TIA Portal multi-admin). Tag every release with the panel serial number and the firmware version it was tested against.
• UPS the panel supply. A 24 V DC UPS or a capacitor-backed power module eliminates the largest single source of corruption: mid-transfer brown-out. The Siemens SITOP range is the canonical choice: SITOP DC UPS selection tool.
• Never use a "CN" cloned S7-200 with genuine Siemens software. The cloned CPU shares the MPI/PPI physical layer but uses a non-standard bootstrap loader. Siemens software will not communicate with it reliably, and the boot loader can produce stray bus traffic that corrupts the HMI transfer. Genuine S7-200 CPUs use article numbers 6ES7 214-xxx or 6ES7 216-xxx; the "CN" variants have different marking and are listed in the Siemens product safety advisory SIMATIC S7-200 product notice.
• Use ProSave to schedule periodic backups. ProSave's Backup operation writes a complete .hmi + .ldf + *.log + recipe snapshot to a network share. Schedule it weekly via Windows Task Scheduler and store the snapshots in a versioned directory. The recovery time after a corruption event drops from hours to minutes.

Field-Proven Diagnostics Matrix

FAQ