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Review technical specifications, lifecycle risks, and migration paths for the Siemens 6AV6644-0AC01-2AX1 SIMATIC MP 377 19-inch touch panel. Learn how to manage legacy stock.
Product Overview
The Siemens 6AV6644-0AC01-2AX1 is a SIMATIC MP 377 19-inch Multi Panel featuring a color TFT widescreen display with touch functionality. It runs WinCC Flexible or WinCC Comfort (TIA Portal) runtime environments and serves as a high-capacity operator interface for complex, line-level visualization tasks across legacy automation architectures.
- Condition: Refurbished (tested) or New Surplus represents the realistic market profile; New Original Factory Sealed units are rare given the legacy status of this series.
- Availability: Subject to diminishing global secondary market pools. Standard replacement turnarounds range from immediate dispatch for on-shelf stock to 3 weeks for fully certified refurbished units.
- Warranty: 12-month functional warranty covering all display, touch-matrix, and communication port components.
Version 1: Standard SEO Review Style
Are you protecting your critical lines from sudden HMI failures, or are you waiting for an aged backlight to go dark before checking stock? The Siemens 6AV6644-0AC01-2AX1 is a massive 19-inch touch operator panel that anchors older automation systems. Because it belongs to a mature product family, managing this module is an exercise in asset lifespan extension. Relying on sudden factory replacements is no longer an option, making strategic second-source procurement a necessity for plant continuity.
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| Parameter | Value |
+--------------------------+---------------------------------------------------------+
| Brand & Part Number | Siemens 6AV6644-0AC01-2AX1 |
| Product Family | SIMATIC MP 377 Series (Multi Panel) |
| Display Size & Type | 19.0-inch TFT Widescreen Display |
| Control Interface | Analog Resistive Touch Screen |
| Interfaces Onboard | 1x RS422/RS485 (Profibus DP), 2x RJ45 Ethernet, 2x USB |
| Configuration Software | WinCC Flexible 2008 SP1 Standard or TIA Portal WinCC |
| Input Operating Voltage | 24 VDC (Acceptable range: 18 to 32 VDC) |
| Memory Capacity | 12 MB User Memory + Slot for SD/Multimedia Card |
+--------------------------+---------------------------------------------------------+ Field deployment reviews confirm that the 19-inch resistive touch grid responds reliably even when operated by technicians wearing heavy industrial work gloves. Dual built-in Ethernet interfaces allow the device to split traffic cleanly—handling local IO polling on one port while feeding operational KPIs upward to a plant-wide MES on the other.
Keep in mind that the CCFL backlights in these older displays degrade over time, losing significant luminosity after approximately 50,000 operational hours.
Asset Lifecycle & Inventory Strategy
- Stocking Recommendation: For facilities operating more than two active units on the floor, maintain exactly 1 certified refurbished unit on-site as an insurance policy.
- Replenishment Strategy: Utilize strategic hoarding before regional secondary market supplies dry up completely, establishing formal supply lines with specialized legacy component vendors.
- Not Recommended For: Green field engineering designs or new machine builds. Specifying a legacy MP 377 unit in new installations creates unnecessary maintenance liabilities from day one; utilize the contemporary SIMATIC Comfort or Unified Comfort panel equivalents instead.
Version 2: Natural Conversational Recommendation Style
What is the actual cost of a line sitting idle because an operator cannot input recipes? Looking into the Siemens 6AV6644-0AC01-2AX1 shows why this massive panel became a standard fixture in large automotive and bottling plants. It blends the processing power of an industrial PC with the ruggedness of a dedicated hardware interface.
Out in the field, maintenance teams often struggle with the transition away from classic Profibus setups. Well, technically this multi-panel supports both older Profibus DP networks and newer PROFINET rings over its dual RJ45 ports, giving you a convenient bridge when updating parts of a production cell.
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| Parameter | Value |
+--------------------------+---------------------------------------------------------+
| Display Colors | 64,536 Color Blend Depth |
| Resolution Output | 1280 x 1024 Pixels |
| Backup Configuration | Backup/Restore via ProSave or External Memory Card |
| Front Panel Protection | IP65 Enclosure Rating (When mounted correctly in panel) |
| Backing Storage Options | CF Card Slot, SD/MMC Slot, USB Media Storage Compatible |
+--------------------------+---------------------------------------------------------+ One major operational benefit of the MP 377 series is its integrated backup flexibility. By using the standard Siemens ProSave utility or an onboard storage card, an unconfigured replacement unit can be flashed directly at the machine enclosure without pulling out a programming laptop.
This functionality drops your mean time to repair (MTTR) down to the time it takes to loosen the mounting clips on the back edge of the cutout.
Procurement & Vendor Guide
- Vendor Management: Ensure your chosen vendor performs explicit functional verification testing on the touch matrix and communication ports before shipping, rather than just doing a simple “power-on” test.
- Buffer Stock Metrics: When your facility enters an active migration phase, your safety stock requirements drop. Maintain a tight buffer until your application code is successfully ported over to modern hardware platforms.
- Not Recommended For: Harsh washdown environments where high-pressure, high-temperature chemical sprays are directed at the front panel face, as the aging gasket material on legacy stock degrades under intense chemical exposure.
Version 3: Objective Comparison / Decision Style
Managing capital efficiency on older lines requires comparing the cost of maintaining legacy inventory against the engineering hours needed for a hardware platform migration. When managing the Siemens 6AV6644-0AC01-2AX1, engineers must choose between buying replacement units from surplus stock or moving to modern SIMATIC Comfort panels.
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| Feature | SIMATIC MP 377 | SIMATIC Comfort TP1900 |
| | (6AV6644-0AC01-2AX1) | (Modern Equivalent) |
+-------------------------+-------------------------+-------------------------+
| Display Backlight | CCFL (Ages over time) | LED (Long-life span) |
| Native Software Platform| WinCC Flexible / TIA | TIA Portal WinCC Only |
| Legacy Bus Support | Integrated Profibus DP | Requires Adapter / Bus |
| Memory Architecture | 12 MB Non-Volatile Space| High-Capacity Solid State|
| Market Lifecycle Status | Legacy / Discontinued | Actively Supported |
+-------------------------+-------------------------+-------------------------+ Analyzing these technical differences makes one point clear: sticking with the 6AV6644-0AC01-2AX1 is a short-term solution to avoid immediate rewriting costs for your HMI screens. The MP 377 preserves your original WinCC Flexible runtime scripts, which eliminates engineering risks during an unexpected breakdown.
However, be prepared for escalating procurement costs. As secondary market stocks dwindle globally, the unit price for verified, functional surplus panels climbs, which impacts your overall carrying costs.
Obsolescence Strategy
- Last-Time-Buy Planning: Because the official manufacturer lifecycle window is closed, establish agreements with reliable independent stocking distributors to lock in your long-term replacement panel needs.
- Consignment Inventory: For multi-site manufacturing networks, consolidate your remaining legacy panels into a central corporate inventory pool rather than keeping duplicates across every separate facility.
- Not Recommended For: Facilities aiming to standardize entirely on modern industrial IoT data collection setups, because the legacy operating system layer limits modern data-streaming options.
Quick Conclusions
- Role: Large-format, line-level HMI operator interface module running legacy WinCC applications.
- Connectivity: Native ports for both Profibus DP serial and PROFINET communication protocols.
- Lifecycle State: Discontinued by OEM; replacements must be sourced from certified surplus or refurbished channels.
- Inventory Action: Keep 1 verified backup panel on hand if you cannot afford the engineering downtime needed for a step-by-step TIA Portal migration.
FAQ
What configuration software is required for the 6AV6644-0AC01-2AX1?
The panel is typically programmed using Siemens WinCC Flexible 2008 SP1 or higher. It can also be integrated into newer TIA Portal environments using WinCC Comfort or WinCC Advanced software, depending on the firmware version loaded on the device.
Can I load my HMI project file onto a replacement unit without the original source code?
Yes. If you have a compiled runtime backup (.psb file) created via the Siemens ProSave utility, you can restore that image directly onto a replacement 6AV6644-0AC01-2AX1 panel over an Ethernet connection or via a memory card.
What is the typical cause of screen failure on these units?
The two most common failure modes on older MP 377 panels are touch-matrix degradation (dead spots from repetitive pressing) and CCFL backlight failure, where the screen flickers or goes completely dark while the status LEDs remain lit.
Are the mounting cutout dimensions identical for modern replacement panels?
No. If you decide to upgrade from the 19-inch MP 377 to a modern SIMATIC Comfort TP1900 panel, the physical panel cutout dimensions differ. You will need to use an official Siemens adapter plate or modify the metal enclosure door cutout.
Channel Adaptation Notes
- For B2B Marketplace Listings: Position the exact Siemens part number code “6AV6644-0AC01-2AX1” clearly at the top of the product listing text. Specify the condition as “Refurbished – Fully Tested” and clearly list the available shipping methods to help procurement managers during line-down emergencies.
- For LinkedIn Technical Posts: Focus on migration risks and legacy maintenance strategy. Explain how utilizing a certified refurbished MP 377 panel can delay costly panel redesigns, buying extra time to schedule complete system overhauls during planned plant shutdowns.
- For Internal Procurement Wikis: Classify this component as a high-risk legacy asset. Include the step-by-step ProSave backup and restore procedure alongside the part listing so emergency response technicians can quickly swap out failed panels during night shifts.
