Siemens SIMATIC HMI MP 377 Modules – 6AV7422-2FC03-0AS0

Technical Dossier

Product Details And Specifications

Siemens SIMATIC HMI MP 377 Series Technical Notes

The Siemens SIMATIC HMI MP 377 series represents a class of high-performance Multi Panel operator interfaces deployed across global heavy industry sectors including petrochemical refineries, nuclear power generation facilities, offshore platforms, and continuous-process chemical plants. Built on the SIMATIC HMI platform, the MP 377 line operates under Windows CE and integrates natively with SIMATIC S7-300, S7-400, and WinCC flexible runtime environments. Its ruggedized enclosure ratings (IP65 front panel), wide operating temperature tolerance, and support for PROFIBUS DP and Industrial Ethernet make it a standard specification in long-lifecycle DCS and SCADA architectures. Installed base units remain in active service across facilities with 15–25 year operational horizons, creating sustained demand for spare parts, repair units, and lifecycle extension services.

The Evolution of MP 377 Architecture

The MP 377 series succeeded the MP 370 line, introducing a transition from the earlier SIMATIC Panel PC 670/870 architecture to a unified Multi Panel platform. Early MP 377 units (circa 2006–2009) shipped with WinCC flexible 2007 and supported PROFIBUS DP as the primary fieldbus. Subsequent firmware revisions introduced Industrial Ethernet (PROFINET IO) support, enabling integration with S7-300/400 controllers via standard TCP/IP infrastructure without dedicated DP masters.

The 12-inch (6AV7422-x) and 15-inch (6AV7423-x) display variants share a common backplane and communication module architecture, allowing cross-variant spare part compatibility for power supply boards, touch controllers, and communication adapters. The series entered the mature/end-of-mainstream-support phase circa 2018, with Siemens designating the SIMATIC HMI Comfort Panel (TP/MP 1200/1500) as the recommended migration path. However, the MP 377 remains in active production support through Siemens Industry Online Support, and third-party lifecycle extension providers continue to supply refurbished and tested units.

Key compatibility constraints: WinCC flexible 2008 SP5 is the final supported engineering software version. Migration to TIA Portal requires project conversion and hardware replacement. Backplane bus communication is proprietary and not forward-compatible with Comfort Panel hardware.

SIMATIC HMI MP 377 Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly stocked models within the MP 377 product family. Units are classified by display size, touch/key configuration, and communication interface.

12-Inch Display Variants (6AV7422-x)

• 6AV7422-2FC03-0AS0: MP 377 12" Touch, 800x600 SVGA, PROFIBUS DP + Ethernet, 256 MB RAM, Windows CE 5.0
• 6AV7422-2AC03-0AS0: MP 377 12" Touch, standard configuration, PROFIBUS DP interface, no Ethernet
• 6AV7422-2DC03-0AS0: MP 377 12" Touch + Key, combined touch/function key panel, PROFIBUS DP + Ethernet
• 6AV7422-2EC03-0AS0: MP 377 12" Key, function key-only operation, PROFIBUS DP, industrial keypad interface
• 6AV7422-2BC03-0AS0: MP 377 12" Touch, PROFIBUS DP, 64 MB RAM, earlier production batch

15-Inch Display Variants (6AV7423-x)

• 6AV7423-2FC03-0AS0: MP 377 15" Touch, 1024x768 XGA, PROFIBUS DP + Ethernet, 256 MB RAM
• 6AV7423-2AC03-0AS0: MP 377 15" Touch, PROFIBUS DP only, standard industrial enclosure
• 6AV7423-2DC03-0AS0: MP 377 15" Touch + Key, dual-input configuration, PROFIBUS DP + Ethernet
• 6AV7423-2EC03-0AS0: MP 377 15" Key, function key panel, PROFIBUS DP, no touch layer
• 6AV7423-2BC03-0AS0: MP 377 15" Touch, PROFIBUS DP, 64 MB RAM, legacy production variant

Accessories, Spare Parts & Communication Modules

• 6AV7671-1EX00-0AX0: SIMATIC HMI USB memory module, compatible with MP 377 backup/restore operations
• 6AV6671-5AE11-0AX0: WinCC flexible 2008 SP5 engineering software, required for MP 377 project configuration
• 6GK1500-0FC10: PROFIBUS DP bus connector, 90-degree cable exit, compatible with MP 377 DP port
• 6ES7972-0BB52-0XA0: PROFIBUS DP terminating resistor plug, required for end-of-line MP 377 installations
• 6AV7422-2FC03-0BX0: MP 377 12" Touch repair/exchange unit, factory-refurbished, functionally equivalent to -0AS0
• 6AV6545-0DA10-0AX0: TP 270 10" predecessor reference, documents migration baseline from earlier HMI generation

Sourcing Hard-to-Find & Obsolete MP 377 Parts

For operators running MP 377 panels in facilities with remaining operational lifespans of 5–15 years, DriveKNMS provides: (1) direct unit replacement with tested equivalents, (2) component-level repair for display assemblies, touch controllers, and power supply boards, (3) firmware backup and restoration services to preserve site-specific WinCC flexible runtime configurations, and (4) cross-reference support for identifying functionally equivalent substitute order codes where the original SKU is no longer procurable. All sourced units are accompanied by full traceability documentation. Exchange units are available for critical-path procurement scenarios requiring same-week dispatch.

Quality Control for the MP 377 Range

MP 377 panels present specific test challenges due to their integrated backplane bus architecture, proprietary PROFIBUS DP physical layer implementation, and Windows CE operating environment. DriveKNMS applies a structured test protocol to all MP 377 units prior to dispatch:

• Power-on and boot verification: Unit must complete Windows CE boot sequence and load WinCC flexible runtime without error flags within specified timeout parameters.
• Display calibration: Touch layer linearity and pressure sensitivity tested across full active display area using calibration grid protocol.
• PROFIBUS DP communication test: Unit connected to S7-300 test rack; cyclic data exchange verified at 1.5 Mbit/s and 12 Mbit/s baud rates.
• Ethernet interface verification: PROFINET IO connection established with S7-300 PN controller; tag read/write cycle confirmed.
• Backplane bus integrity check: Internal communication bus tested for signal integrity; known failure mode (capacitor degradation on power supply board) inspected and remediated where identified.
• Thermal soak test: Unit operated at elevated ambient temperature (50 degrees C) for minimum 4 hours to screen for latent thermal failures.