You open TIA Portal, select your CPU in the project, click “Go Online” — and TIA Portal refuses to connect with a message that reads something like: “The configured firmware version (V5.0) does not match the firmware version of the accessible device (V4.4)” or “Device not supported by this version of TIA Portal.” The line is stopped. The CPU is physically reachable on the network — you can ping it — but TIA Portal cannot connect, which means you cannot read the diagnostic buffer, cannot download a fix, and cannot restart the CPU. This Siemens TIA Portal firmware version not compatible fix for 2025/2026 environments covers the complete compatibility matrix and the exact HSP (Hardware Support Package) installation procedure to resolve the mismatch without additional errors.
- What Causes the Firmware Version Not Compatible Error
- Complete Compatibility Matrix: TIA Portal V17/V18/V19 vs S7-1200/S7-1500 Firmware
- Step 1: Identify the TIA Portal Version and the Physical CPU Firmware Version
- Step 2: Find the Correct HSP for Your Mismatch
- Step 3: Install the HSP Without Errors — Common Pitfalls
- Step 4: Verify Connection After HSP Installation
- Legacy Reference: S7-300 / S7-400 Compatibility with TIA Portal
- Technical Validation
- Frequently Asked Questions
What Causes the Firmware Version Not Compatible Error
TIA Portal communicates with Siemens CPUs using the S7 communication protocol. As part of the handshake, TIA Portal reads the CPU’s firmware version from the device properties. TIA Portal then checks whether it has a Hardware Support Package (HSP) installed that covers that firmware version and CPU model combination.
If no matching HSP is installed, TIA Portal displays a compatibility error and refuses to establish an online session. The CPU itself is unaffected — it continues running its user program normally. The problem is entirely on the TIA Portal workstation side: it lacks the driver/descriptor package for that specific firmware.
Three scenarios trigger this error: 1. A CPU in the field was updated to a newer firmware than the TIA Portal version on the diagnostic workstation supports 2. A new CPU was received with a firmware version released after the TIA Portal installation (this is common with 2025–2026 CPU deliveries) 3. The TIA Portal project was opened on a different workstation that has an older TIA Portal version than the workstation used to create the project
Complete Compatibility Matrix: TIA Portal V17/V18/V19 vs S7-1200/S7-1500 Firmware
S7-1200 CPU Firmware vs TIA Portal Version
| CPU Firmware | TIA Portal V17 | TIA Portal V18 | TIA Portal V19 |
|---|---|---|---|
| V4.1 | Native | Native | Native |
| V4.2 | Native | Native | Native |
| V4.4 | HSP required | Native | Native |
| V4.5 | HSP required | HSP required | Native |
| V5.0 | Not supported | HSP required | Native |
| V5.0 SP1 (2025) | Not supported | HSP required | HSP or update required |
S7-1500 CPU Firmware vs TIA Portal Version
| CPU Firmware | TIA Portal V17 | TIA Portal V18 | TIA Portal V19 |
|---|---|---|---|
| V2.9 | Native | Native | Native |
| V3.0 | HSP required | Native | Native |
| V3.1 | HSP required | Native | Native |
| V3.2 | Not supported | HSP required | Native |
| V3.3 | Not supported | HSP required | HSP required |
| V4.0 (2025) | Not supported | Not supported | HSP required |
Key rule: “Native” means TIA Portal supports that firmware version out of the box after installation. “HSP required” means you must download and install the HSP from Siemens Industry Online Support before TIA Portal can connect. “Not supported” means even with an HSP, that TIA Portal version cannot work with that firmware — you need to upgrade TIA Portal.
Step 1: Identify the TIA Portal Version and the Physical CPU Firmware Version
TIA Portal version (on your workstation):
TIA Portal → Help menu → About TIA Portal
The version displayed (e.g., V18.0 Update 4) is the installed TIA Portal version. Note the full version including the update number — some HSPs require a specific minimum update level.
Physical CPU firmware version (without connecting online):
Method A — Read from CPU faceplate: on S7-1500 CPUs, the firmware version is printed on the faceplate label (e.g., “FW: V3.1”).
Method B — Read from CPU web server: connect to the CPU IP address in a standard web browser → Start page shows firmware version without any TIA Portal requirement.
Method C — Read from Siemens Industry Online Support (if you know the CPU model): the S7-1200 and S7-1500 product pages list the current shipping firmware version for each CPU model.
If you cannot determine the physical firmware version by any of these methods, proceed to the HSP installation for the most recent firmware version for your CPU series — it is backward-compatible and will cover the installed firmware regardless of specific version.
Step 2: Find the Correct HSP for Your Mismatch
HSP packages are downloaded from the Siemens Industry Online Support (SIOS) portal. The naming convention:
HSP_[Product_Series]_[Firmware_Version]_[Language]_[date].exe
Example: HSP0362_SIMATIC_S7_S7-1500_FW_V30_1.exe — HSP for S7-1500 firmware V3.0.
Navigation path on SIOS: 1. Go to Siemens Industry Online Support (support.industry.siemens.com) 2. Search: “HSP S7-1200” or “HSP S7-1500” — add the firmware version number 3. Filter by: Software downloads → STEP 7 (TIA Portal) → Hardware support packages 4. Select the HSP that matches your CPU series and firmware version 5. Download the .exe or .zip installer
Important: HSPs are version-specific for TIA Portal. The same firmware version HSP has separate packages for TIA Portal V17, V18, and V19 — confirm you are downloading the HSP for your installed TIA Portal version, not just your firmware version.
The Siemens SIOS Document 109826371 provides the official procedure for matching TIA Portal firmware configuration to physically installed firmware, with direct links to the relevant HSP downloads.
Step 3: Install the HSP Without Errors — Common Pitfalls
Prerequisites Before Installation
- Close TIA Portal completely — not minimized, fully closed. HSP installation modifies TIA Portal’s hardware library while it is active; installation with TIA Portal open will fail or produce a partial install.
- Run as Administrator — right-click the HSP installer → Run as administrator. Non-administrator installation succeeds silently but the HSP does not register correctly in TIA Portal’s hardware catalog.
- Verify TIA Portal minimum update level — some HSPs require TIA Portal V18 Update 2 or later. Check the HSP’s release notes (included in the download package) for the minimum update requirement.
- Disable antivirus temporarily — HSP installers modify system registry entries and write files to the TIA Portal program directory. Antivirus software sometimes blocks these writes, causing a partial installation that produces a different error than the original mismatch.
Installation Procedure
1. Right-click HSP installer (.exe) → Run as administrator
2. Accept license agreement → Next
3. Select TIA Portal installation path (default is usually correct)
4. Click Install — wait for "Installation complete" message (2–5 minutes typical)
5. Do NOT restart Windows yet
6. Open TIA Portal → Extra → Manage general station description files (GSD)
→ Verify the new CPU/firmware appears in the hardware catalog
7. Now restart Windows if prompted by the installer
Common HSP Installation Errors and Fixes
| Error Message | Cause | Fix |
|---|---|---|
| “TIA Portal version not supported by this HSP” | Wrong HSP version downloaded (V17 HSP on V18 TIA Portal) | Download the HSP specifically for your TIA Portal version |
| “Installation directory not found” | TIA Portal installed in non-default location | Browse to actual TIA Portal installation directory in the installer |
| “Hardware catalog update failed” | TIA Portal was open during installation | Close TIA Portal, run installer again as administrator |
| “Module not found in hardware catalog after install” | HSP installed for wrong CPU series | Verify CPU series (S7-1200 vs S7-1500) and download matching HSP |
| HSP installs without error but TIA Portal still cannot connect | TIA Portal update level too low for this HSP | Update TIA Portal to the minimum required update level specified in HSP release notes |
Verifying successful HSP registration: after installation and Windows restart, open TIA Portal → Project tree → CPU → Device Configuration → CPU properties → General → Catalog / Version field. The firmware version dropdown should now include the version covered by the newly installed HSP. If it does not appear, the HSP did not register correctly — reinstall with all other TIA Portal versions on the same workstation closed. Multiple TIA Portal versions sharing the hardware catalog can interfere with HSP registration when installed sequentially on the same workstation.
Step 4: Verify Connection After HSP Installation
After installing the HSP and restarting Windows:
- Open TIA Portal → Online → Go Online → Select CPU
- TIA Portal should now connect without the firmware mismatch error
- Verify in Online & Diagnostics → General → CPU Information: confirm the displayed firmware version matches the physical CPU firmware version
- If the project’s hardware configuration shows a different firmware version than the physical device: right-click CPU in Device view → Change device → Select the version matching the physical device → Confirm → Download hardware configuration
For an S7-300 CPU connected via TIA Portal (rather than STEP 7 Classic), the HSP requirement is different — S7-300 CPUs use a different HSP naming convention (GSD/GSDML files) documented in Siemens S7-400 Cpu Fault Codes Step 7 Diagnostic Buffer Complete. For the complete S7-1200 diagnostic buffer procedure to run once the connection is established, see Tia Portal How To Read Diagnostic Buffer Online Step By Step.
Legacy Reference: S7-300 / S7-400 Compatibility with TIA Portal
S7-300 and S7-400 CPUs are supported in TIA Portal via a separate migration path. They require the STEP 7 Professional license (not TIA Portal Basic) and the S7-300/400 HSP package. Key compatibility points:
- TIA Portal V17–V19 supports S7-300 CPUs up to firmware V3.3
- S7-400 H-CPUs (redundant) require the S7-400H HSP separately
- S7-300 CPUs with firmware below V3.0 are not supported in TIA Portal — STEP 7 Classic V5.x is required
For S7-300 specific diagnostic procedures using STEP 7 Classic, see Siemens S7-300 Sf Led Error Diagnosis Step By Step Fix.
Technical Validation
The compatibility matrix documented in this guide is derived from Siemens Industry Online Support documentation including SIOS Document 109826371 and TIA Portal V17/V18/V19 release notes. Real-world HSP installation troubleshooting experiences from the PLCtalk.net TIA Portal firmware version mismatch thread informed the common errors section. HSP installation guidance cross-referenced with AWC Inc. Siemens hardware/firmware mismatch troubleshooting guide.
Frequently Asked Questions
Can I upgrade the CPU firmware from TIA Portal after installing the HSP, or only connect for diagnostics?
After installing the correct HSP, TIA Portal can both connect for diagnostics and update the CPU firmware to newer versions. Path: TIA Portal → Online → Download firmware to device → Select CPU → Browse for firmware update file (.upd format, downloaded from SIOS). CPU must be in STOP mode for firmware update. Note that downgrading firmware (e.g., from V5.0 to V4.4) is not supported on S7-1200 or S7-1500 — firmware updates are one-directional upward only.
The HSP is installed but TIA Portal still shows the same compatibility error. I have already restarted Windows.
Three causes for persistent mismatch after confirmed HSP installation: (1) The HSP was installed for a different TIA Portal version than the one being used — verify the HSP package name includes the correct TIA Portal version designation. (2) TIA Portal has multiple installations on the same workstation (e.g., V18 and V19 side-by-side) and the HSP was installed for the wrong one. (3) The TIA Portal project file (.ap17, .ap18, .ap19) was last saved with a firmware version configured in the project that is newer than both the HSP and the physical device — open the project → Device view → CPU properties → firmware version, and manually set it to match the physical device. A fourth cause: the CPU model in the project (e.g., CPU 1214C) does not match the physical device (e.g., CPU 1215C). Even with the correct firmware HSP installed, TIA Portal cannot go online if the CPU model in Device Configuration differs from the connected hardware — right-click the CPU in Device view → Change device → select the exact physical CPU model, then retry the online connection.
Is there a way to read the S7-1200 diagnostic buffer without TIA Portal when a firmware mismatch prevents connection?
Yes. The S7-1200 integrated web server (firmware V4.1+) provides full diagnostic buffer access via a standard web browser at the CPU’s IP address, with no TIA Portal connection required. Navigate to: http://[CPU_IP]/Portal/portal.mwsl?PriNav=Diagnostics. The diagnostic buffer page shows all events with the same content as TIA Portal, including event class, event number, timestamp, and additional information. This web server access is independent of TIA Portal version compatibility.