Siemens 6ES5816-0AA11 Operating EPROM Module

Engineered for SIMATIC S5 System Firmware Storage

This module stores the operating system for the SIMATIC S5 CPU. It provides essential system firmware for the Siemens 6ES5816-0AA11 unit. You will find this EPROM card in legacy SIMATIC S5 controllers. Unlike user program modules, this version holds the core operating system code. It contains 32 KB of firmware for CPU boot and execution.

Technical Specifications & Physical Dimensions

We designed this operating EPROM module for critical system functions. The table below presents all verified technical specifications.

Parameter	Specification
Memory Capacity	32 KB (256 Kbit)
Memory Type	UV-EPROM (erasable programmable)
Package Type	28-pin DIP (dual in-line)
Physical Dimensions	38mm x 14mm x 9mm
Total Weight	12 grams
Operating Voltage	5V DC (±5%)
Access Time	250 nanoseconds maximum

Functional Architecture and System Integration

This operating EPROM plugs directly into the S5 CPU’s system socket. It contains the executive firmware for all PLC operations. You cannot run the CPU without this module installed. Moreover, the module includes the interrupt handling and task scheduler routines. These components control scan cycles and peripheral communications. Consequently, the CPU performs real-time control based on this firmware.

Installation and Operational Guidelines

The Siemens 6ES5816-0AA11 retains operating code for over 20 years. It requires a UV eraser for any firmware updates. You must align pin 1 with the socket marker precisely. Always cover the quartz window with an opaque label after installation. This practice prevents UV exposure from ambient light sources. Furthermore, the module supports boot-time checksum verification automatically. This feature ensures system integrity before each startup.

Physical Characteristics and Environmental Limits

This operating EPROM features a hermetic ceramic body construction. Its lightweight 12 gram design allows for simple replacement. The layout follows Siemens standard memory module specifications. Therefore, it fits securely into any S5 CPU system socket. The module requires no battery backup for data retention. In addition, it maintains stable operation between 0°C and 70°C ambient temperature. You can store this module safely between -55°C and 125°C.