Siemens has published formal migration paths across several SIMATIC HMI generations — older TP/OP/MP 177/277 panels migrated to SIMATIC Comfort Panels, and Comfort Panels are now themselves migrating to SIMATIC Unified Comfort Panels. Successor hardware and project migration are two separate questions; this guide covers both.
Siemens has published formal migration paths across several SIMATIC HMI generations. Older TP/OP/MP 177/277 panels were migrated to SIMATIC Comfort Panels, and Siemens now identifies SIMATIC Unified Comfort Panels as the suitable successor generation for the 6AV2124 Comfort Panel family. Successor does not mean zero-engineering swap. HMI replacement usually involves two separate questions: which hardware is the Siemens successor, and how the existing HMI project is migrated. Mounting cutout, communication, software generation, screen resolution, scripts, recipes, alarms and PLC integration must all be checked before ordering.
On January 31, 2026, Siemens announced product phase-out milestone P.M400 for the remaining SIMATIC HMI Comfort Panels. Siemens identifies SIMATIC Unified Comfort Panels as suitable successor products. The 15-inch to 22-inch Comfort devices had entered phase-out earlier, while the remaining 4-inch to 12-inch models reached P.M400 in January 2026.
For a failed 6AV2124 Comfort Panel, the decision is no longer simply "buy the same panel or upgrade." First check exact legacy availability and project urgency; for planned modernization, use Siemens' Unified Comfort migration path and assess the engineering work.
| Comfort Panel | Legacy article no. | Unified successor | Successor family pattern |
|---|---|---|---|
| KTP400 Comfort | 6AV2124-2DC01-0AX0 | MTP700 Unified Comfort | 6AV2128-3GB.6-0AX1 |
| TP700 Comfort | 6AV2124-0GC01-0AX0 | MTP700 Unified Comfort | 6AV2128-3GB.6-0AX1 |
| KP700 Comfort | 6AV2124-1GC01-0AX0 | MTP700 Unified + external key modules where needed | 6AV2128-3GB.6-0AX1 + KP8/KP32 |
| TP900 Comfort | 6AV2124-0JC01-0AX0 | MTP1000 Unified Comfort | 6AV2128-3KB.6-0AX1 |
| KP900 Comfort | 6AV2124-1JC01-0AX0 | MTP1000 Unified + external key modules where needed | 6AV2128-3KB.6-0AX1 + KP8/KP32 |
| TP1200 Comfort | 6AV2124-0MC01-0AX0 | MTP1200 Unified Comfort | 6AV2128-3MB.6-0AX1 |
| KP1200 Comfort | 6AV2124-1MC01-0AX0 | MTP1200 Unified + external key modules where needed | 6AV2128-3MB.6-0AX1 + KP8/KP32 |
| TP1500 Comfort | 6AV2124-0QC02-0AX1 / -0AX2 | MTP1500 Unified Comfort | 6AV2128-3QB.6-0AX1 |
| KP1500 Comfort | 6AV2124-1QC02-0AX1 / -0AX2 | MTP1500 Unified + external key modules where needed | 6AV2128-3QB.6-0AX1 + KP8/KP32 |
| TP1900 Comfort | 6AV2124-0UC02-0AX1 | MTP1900 Unified Comfort | 6AV2128-3UB.6-0AX1 |
| TP2200 Comfort | 6AV2124-0XC02-0AX1 | MTP2200 Unified Comfort | 6AV2128-3XB.6-0AX1 |
Siemens' phase-out announcement uses family patterns such as 6AV2128-3GB.6-0AX1 rather than one single market-neutral full order number — we preserve that pattern here rather than inventing the missing variant character; verify the exact country/variant order number with Siemens before ordering.
Siemens' Comfort Panel delivery release and migration guide provide a clear predecessor-to-Comfort path for many widely installed 6AV6 legacy panels — these exact order numbers are high-value search terms for buyers still running them.
| Legacy Siemens HMI | Legacy order no. | Comfort successor | Comfort order no. |
|---|---|---|---|
| TP 177B 6" PN/DP Color | 6AV6642-0BA01-1AX1 | TP700 Comfort | 6AV2124-0GC01-0AX0 |
| TP 277 6" | 6AV6643-0AA01-1AX0 | TP700 Comfort | 6AV2124-0GC01-0AX0 |
| OP 277 6" | 6AV6643-0BA01-1AX0 | KP700 Comfort | 6AV2124-1GC01-0AX0 |
| MP 277 8" Touch | 6AV6643-0CB01-1AX1 | TP900 Comfort | 6AV2124-0JC01-0AX0 |
| MP 277 8" Key | 6AV6643-0DB01-1AX1 | KP900 Comfort | 6AV2124-1JC01-0AX0 |
| MP 277 10" Touch | 6AV6643-0CD01-1AX1 | TP1200 Comfort | 6AV2124-0MC01-0AX0 |
This is especially valuable for older machines, because the historically documented successor may itself now be in phase-out. A buyer searching an MP277 or TP177B needs the complete modernization chain, not only the first-generation successor.
| Original model | Original panel | Historical Comfort successor | Current Unified direction |
|---|---|---|---|
| 6AV6642-0BA01-1AX1 | TP177B 6" | 6AV2124-0GC01-0AX0 TP700 Comfort | 6AV2128-3GB.6-0AX1 MTP700 Unified |
| 6AV6643-0AA01-1AX0 | TP277 6" | 6AV2124-0GC01-0AX0 TP700 Comfort | 6AV2128-3GB.6-0AX1 MTP700 Unified |
| 6AV6643-0BA01-1AX0 | OP277 6" | 6AV2124-1GC01-0AX0 KP700 Comfort | 6AV2128-3GB.6-0AX1 + key-module strategy |
| 6AV6643-0CB01-1AX1 | MP277 8" Touch | 6AV2124-0JC01-0AX0 TP900 Comfort | 6AV2128-3KB.6-0AX1 MTP1000 Unified |
| 6AV6643-0DB01-1AX1 | MP277 8" Key | 6AV2124-1JC01-0AX0 KP900 Comfort | 6AV2128-3KB.6-0AX1 + key-module strategy |
| 6AV6643-0CD01-1AX1 | MP277 10" Touch | 6AV2124-0MC01-0AX0 TP1200 Comfort | 6AV2128-3MB.6-0AX1 MTP1200 Unified |
Siemens' Comfort migration guide explicitly compares mounting cutouts and enclosure dimensions. Some Comfort Panels were designed around compatible cutouts with predecessor devices, but display format, bezel size and device depth can still differ.
| Comfort device | Siemens-listed predecessor mounting family | Practical check |
|---|---|---|
| TP700 Comfort | TP177B 6", MP177 6", TP277 6" | Cutout compatibility is favorable, but verify bezel/depth and cable access |
| TP900 Comfort | MP277 8" Touch | Check enclosure/front dimensions and internal clearance |
| KP900 Comfort | MP277 8" Key | Check key-panel geometry and door cutout |
| TP1200 Comfort | MP277 10" Touch | Check cutout, bezel and internal space before ordering |
For Comfort → Unified modernization, Siemens also documents mounting compatibility for several Unified Comfort sizes. Larger Unified devices may use adapter frames in some predecessor cutouts — always verify the exact current hardware manual before machining the panel door.
Replacing the physical HMI also requires migration of the project data. Older projects may originate in ProTool or WinCC flexible, while Comfort Panels use WinCC in TIA Portal and Unified Panels use WinCC Unified.
Siemens provides a dedicated "Guide for Migrating to WinCC Unified HMI Devices" and the Data2Unified TIA Portal add-in. Siemens describes Data2Unified as a tool that can reduce migration effort — it is not a comprehensive migration tool. Use Siemens' WinCC Unified modernization guidance to assess the existing project, use Data2Unified where supported to transfer or assist with reusable content, plan manual engineering for functions that aren't converted automatically, and re-test user interaction, scripts, styles, alarms, recipes, logging and communication behavior in WinCC Unified.
The correct customer message: Siemens provides migration tools that reduce engineering effort, but Comfort-to-Unified modernization still requires engineering and validation.
Siemens publishes separate guidance for migrating or converting certain SIMATIC HMI devices when the original engineering project is unavailable. The feasible route depends on the old device and the type of backup available — treat this as a special recovery/migration case, not something that works automatically for every panel.
Do not choose a Unified Panel only by screen size if the existing machine still depends on a legacy MPI/PROFIBUS HMI connection. Confirm the controller/network architecture and the supported migration design first.
| Strategy | When it may make sense | Main risk |
|---|---|---|
| Source the exact original 6AV6 legacy panel | Production must restart immediately; editable project is unavailable; machine changes are unacceptable | Legacy stock condition, authenticity, age and future availability |
| Use the historical 6AV2124 Comfort successor | A validated Comfort migration already exists or an exact Comfort spare is required | Comfort Panels themselves are now in phase-out |
| Plan migration to 6AV2128 Unified Comfort | Long service life and current platform support matter | Project engineering, communication and operator-interface changes must be validated |
For a Siemens HMI request, we separate five questions: can the exact original 6AV model still be sourced, and what's the condition/source risk; what successor did Siemens officially publish for the original panel generation; has that successor itself entered phase-out, and what's the current Unified successor family; what engineering changes are required (project conversion, cutout, communication, key/touch operation and controller compatibility); and whether a short-term original spare or a planned modernization is economically more appropriate for you.
Full Siemens article number beginning 6AV... · front and rear nameplate photos · screen size and touch/key operation · PLC/controller model · MPI/PROFIBUS/PROFINET/Ethernet/serial connection information · original WinCC flexible / TIA Portal project file if available · ProSave/device backup if that's all that exists · panel cutout dimensions and cabinet-door photo · required quantity and destination country.
Siemens — Delivery Release: SIMATIC HMI Comfort Panels, Entry ID 49727602, 5 May 2011 · Siemens — SIMATIC HMI Comfort Panels Migration Guide, Entry/manual ID 49752044 · Siemens — End of Production for SIMATIC MP 277 Panels with Narrow Frame, Entry ID 63647346 · Siemens — Status change for SIMATIC HMI products, Entry ID 109486162 · Siemens — Product phase-out announcement (P.M400): SIMATIC HMI Comfort Panels, Entry ID 109824856, 31 Jan 2026.
Technical disclaimer: ElecBridge is an independent sourcing service and is not Siemens. This page summarizes Siemens' published migration and phase-out information for practical sourcing use and must not be presented as Siemens engineering approval. Final panel selection, project migration, mounting/cutout fit, communication configuration and commissioning must be verified for the actual machine and control system.
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