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Description
Technical Specifications
| Parameter Name | Value |
|---|---|
| Product Model | 6AA6504-0AA (equivalent to 6AA65040AA) |
| Manufacturer | SIEMENS |
| Product Type | CPU Module / Processor Board |
| Product Family | SICOMP MMC 216 / SICOMP VE 286 |
| Firmware Storage | 2 × 128 KB EPROM (firmware/OS) |
| Working RAM | 2 × 128 KB |
| Expansion Slots | 2 × 32 KB (supports RAM/EPROM/EEPROM) |
| Maximum Total Memory | Approx. 320 KB (with expansion) |
| Backplane Interface | KBUS (at least 2 segments) |
| Compatibility | SICOMP VE 286 19-inch rack |
| Dimensions (W x H x D) | 203 × 25.4 × 254 mm (approx.) |
| Net Weight | Approx. 0.6 kg |
| Product Status | Discontinued (Legacy) |
| Typical Associated System | TELEPERM M / SICOMP Process Control |
Main Features and Advantages
Dedicated Architecture for SICOMP VE 286 Systems: The SIEMENS 6AA6504-0AA is a purpose-built processor board designed exclusively for the SICOMP VE 286 rack platform . As the central “brain” of this legacy industrial computer system, the 6AA6504-0AA provides the computational backbone for executing firmware-based control algorithms and coordinating data flow across the entire rack . Its specialized KBUS interface ensures deterministic communication with co-located I/O and communication modules, a critical requirement for real-time process control applications. The 6AA6504-0AA is neither a general-purpose PLC nor a modern industrial PC, and its value lies precisely in its ability to maintain compatibility with systems based on this discontinued technology.
Memory Flexibility and Expandability: The board features a well-balanced memory architecture that supports both firmware execution and dynamic data processing. The 2 × 128 KB EPROM configuration stores the system firmware and operating system, while the 2 × 128 KB RAM handles real-time process variables . A key advantage of the SIEMENS 6AA6504-0AA is its two expansion slots, which allow for incremental memory upgrades using 32 KB plug-in modules . This flexibility is particularly valuable in legacy environments where the original application memory footprint may need to be extended to accommodate process changes or additional functionality.
Robust Physical Design for Industrial Environments: The SIEMENS 6AA6504-0AA is built to the physical standards of the SICOMP VE 286 rack, ensuring reliable operation in demanding industrial settings . Its form factor and connector layout are designed for easy insertion and removal within the 19-inch rack. The module’s weight of approximately 0.6 kg and its robust PCB construction contribute to its mechanical stability, resisting the effects of vibration and thermal cycling commonly experienced in process plant environments.
Application Field
TELEPERM M Process Control Systems: The primary and most significant application of the SIEMENS 6AA6504-0AA is within the TELEPERM M process control system, a Siemens platform widely deployed in power generation (especially fossil-fuel and nuclear plants), chemical processing, and other heavy process industries . Within these legacy systems, the 6AA6504-0AA is installed in the SICOMP VE 286 rack as the system’s core processing unit, executing the firmware that controls critical process parameters, safety interlocks, and human-machine interfaces.
Legacy Power Plant Automation: The SIEMENS 6AA6504-0AA is a common find in older power plants where it served as the CPU for auxiliary control stations, data acquisition systems, and turbine/generator monitoring equipment. These installations typically date back to the 1990s and early 2000s, and the 6AA6504-0AA remains in service where operators have opted to sustain existing systems through maintenance and spare part replacement rather than undertake a full-scale migration to modern distributed control systems (DCS).
Specialized Industrial Control Terminals: Beyond large-scale process control, the SIEMENS 6AA6504-0AA was also used in specialized industrial control terminals and operator stations that leveraged the SICOMP VE 286 platform. The module’s two expansion slots and KBUS connectivity made it suitable for serving as a local processing unit for specific control zones or for managing communication with older field devices in hybrid automation architectures that combined PLCs with process computers.
Related Products
- 6AA6504-0AA-Compatible EPROMs: Firmware EPROMs specific to the 6AA6504-0AA containing the operating system and control firmware, often version-locked to the original system configuration.
- SICOMP VE 286 Backplane: The passive or active backplane that provides the KBUS connections and power distribution for the 6AA6504-0AA and all other modules in the rack.
- SICOMP VE 286 I/O Interface Modules: A range of I/O interface boards that connect to the 6AA6504-0AA via the KBUS, providing analog and digital input/output channels for field devices.
- SICOMP VE 286 Display Interface Board: A communication module that interfaces the 6AA6504-0AA with operator display terminals and human-machine interface units.
- 32KB RAM/EPROM/EEPROM Expansion Modules: The optional expansion modules that plug into the 6AA6504-0AA to increase its total configurable memory capacity beyond the base 256 KB .
