Product Overview
The SIEMENS 6AA6504-0AA is a central processing unit (CPU) module belonging to the Siemens SICOMP MMC 216 product family, specifically designed as a processor board for the SICOMP VE 286 industrial computer rack system . This CPU module serves as the computational core of Siemens’ early industrial control systems, executing firmware-based control programs and managing process data communication within the VE 286 rack architecture . The SIEMENS 6AA6504-0AA is primarily associated with legacy automation platforms including TELEPERM M and SICOMP process control systems, widely deployed in power generation and process industry applications during the 1990s .
The SIEMENS 6AA6504-0AA is equipped with dual 128 KB EPROM sockets for firmware/operating system storage and dual 128 KB RAM modules for operational data processing . The board provides two expansion slots capable of accommodating 32 KB RAM, EPROM, or EEPROM modules, enabling a maximum total memory configuration of approximately 320 KB . The SIEMENS 6AA6504-0AA communicates with the rack backplane and I/O modules via a minimum of two KBUS segments, ensuring reliable data exchange within the VE 286 framework .
As a legacy component, the SIEMENS 6AA6504-0AA is no longer in active production and is primarily available as tested used units or new old stock (NOS) for maintenance and replacement purposes . It is critical to note that the SIEMENS 6AA6504-0AA is not a SIMATIC S5 or S7 PLC CPU; rather, it is a processor board designed for the SICOMP VE 286 industrial computer platform . For plants still operating TELEPERM M or SICOMP-based control systems, the SIEMENS 6AA6504-0AA represents a vital spare component for maintaining legacy automation infrastructure.
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 6AA6504-0AA |
| Manufacturer | SIEMENS |
| Product Type | CPU Module / Processor Board |
| Product Family | SICOMP MMC 216 / SICOMP VE 286 |
| Processor Type | Mobile Pentium II/III; or VE 286-class CPU (variant dependent) |
| Chipset | Intel 82440BX (North-Bridge 82443 BX) |
| Firmware Storage | 2 × 128 KB EPROM |
| Working RAM | 2 × 128 KB RAM |
| Expansion Slots | 2 (for 32 KB RAM/EPROM/EEPROM modules) |
| Maximum Total Memory | Approx. 320 KB |
| Bus Interface | Minimum 2 segments of KBUS |
| Communication | 10/100 MBaud AMD-LAN controller (79C 973); RS-232; Parallel |
| System Integration | ISA-Bridge (South-Bridge) PIIX4E (82371 EB) |
| BIOS | Flash up to 1 Mbyte |
| Super I/O | FDC 37C 672 (Keyboard, Floppy, Serial, Parallel) |
| Power Supply | On-board DC/DC converter for 3.3V |
| Dimensions | 20.3 cm × 2.5 cm × 25.4 cm |
| Weight | Approx. 0.6 kg |
| Condition | Legacy (discontinued; available as NO |