Product Overview

The Siemens 6AV7856-0AE20-1AA0​ is a SIMATIC Panel PC 477B—a 19-inch touch-screen industrial PC that combines high-performance computing with a ruggedized HMI platform for the most demanding automation environments. As a self-contained industrial computer, the Siemens 6AV7856-0AE20-1AA0​ integrates a brilliant 19″ TFT touch display (1280×1024 resolution) with an Intel Celeron M 1.0 GHz processor, 1 GB DDR2 RAM, and a comprehensive suite of industrial communication interfaces into a single, compact, 24 V DC-powered enclosure. Within the SIMATIC family, the Siemens 6AV7856-0AE20-1AA0​ serves as a powerful visualization and control station capable of running WinCC flexible Runtime, Windows XP Embedded, and a broad spectrum of industrial software applications.Engineered for industrial durability, the Siemens 6AV7856-0AE20-1AA0​ features a fanless design that relies on passive heatsink cooling—eliminating the most common failure point in conventional industrial PCs and dramatically extending mean-time-between-failures (MTBF) in 24/7 continuous-duty applications. The front panel achieves IP65 protection, enabling direct installation in dust-prone and washdown environments such as cement plants, food processing facilities, and water treatment stations. Weighing 16.36 kg with outer dimensions of 66 cm (W) × 28 cm (H) × 55 cm (L), the Siemens 6AV7856-0AE20-1AA0​ is designed for cabinet mounting, rack mounting, or swivel arm installation, providing maximum deployment flexibility.Connectivity is a defining strength of the Siemens 6AV7856-0AE20-1AA0. The panel integrates PROFIBUS DP at 12 Mbps for deterministic communication with SIMATIC S7 PLCs, two 10/100/1000 Mbps Gigabit Ethernet ports for high-speed network integration, four USB 2.0 ports (one front-side with 500 mA high-current capability), one RS232 serial port (COM1) for legacy device connectivity, and two CF card slots for solid-state mass storage. The Siemens 6AV7856-0AE20-1AA0​ operates on a 24 V DC supply (20.4–28.8 V DC range) with ≤15 ms power failure bridging, ensuring uninterrupted operation even during brief power interruptions. Although Siemens declared the Panel PC 477B a mature product in October 2010 and discontinued the type in October 2012, the Siemens 6AV7856-0AE20-1AA0​ continues to serve as the visualization backbone in thousands of manufacturing plants, process facilities, and machine automation systems worldwide. Through specialized automation surplus suppliers and Siemens-authorized service partners, fully tested and refurbished Siemens 6AV7856-0AE20-1AA0​ units—backed by up to 24-month warranties—remain available, protecting the substantial installed base and enabling plant operators to extend the lifecycle of their automation investments for years to come.

Technical Specifications

Main Features and Advantages

Brilliant 19″ High-Resolution Touch DisplayThe Siemens 6AV7865-0AE20-1AA0​ features a premium 19-inch TFT touchscreen rendering crisp visuals at 1280×1024 pixel resolution. The integrated Intel GMA900 graphics controller with 8–128 MB dynamic UMA graphics memory supports CRT resolutions up to 1600×1200 and DVI output, enabling operators to connect external monitors for expanded visualization. The responsive touch interface of the Siemens 6AV7856-0AE20-1AA0​ provides intuitive operator interaction—ideal for industrial environments where keyboard/mouse usage is impractical.Fanless Design for Unmatched ReliabilityOne of the most distinctive advantages of the Siemens 6AV7856-0AE20-1AA0​ is its fanless, passively cooled architecture. By eliminating rotating fans—the #1 failure point in conventional industrial PCs—the Siemens 6AV7856-0AE20-1AA0​ achieves dramatically extended MTBF, reduces maintenance requirements, and eliminates the risk of fan-induced dust circulation within the enclosure. This design philosophy makes the Siemens 6AV7856-0AE20-1AA0​ perfectly suited for 7×24 continuous operation in cement plants, steel mills, and other high-particulate environments.Powerful Intel Celeron M Processing PlatformPowered by an Intel Celeron M 1.0 GHz processor with 400 MHz front-side bus and 512 KB L2 cache, paired with 1 GB of DDR2 SDRAM, the Siemens 6AV7856-0AE20-1AA0​ delivers ample computational performance for running WinCC flexible Runtime, data logging applications, historical trending, and even lightweight control algorithms. The PC/104-Plus expansion capability (up to 3 modules) allows the Siemens 6AV7856-0AE20-1AA0​ to be customized with additional fieldbus interfaces, I/O modules, or specialized communication cards—transforming a standard HMI into a highly tailored industrial computing solution.Comprehensive Industrial Communication SuiteThe Siemens 6AV7856-0AE20-1AA0​ is a communication powerhouse. PROFIBUS DP at 12 Mbps provides deterministic, real-time connectivity to SIMATIC S7 PLCs and a vast ecosystem of PROFIBUS field devices. Dual Gigabit Ethernet ports (10/100/1000 Mbps) enable high-speed network integration, supporting network redundancy, VLAN segmentation, or simultaneous connection to office IT and plant-floor OT networks. The RS232 COM1 port ensures legacy device compatibility, while four USB 2.0 ports—including a high-current 500 mA front-facing connector—facilitate printer connections, barcode scanners, keyboards, mice, and USB mass storage devices.