Siemens 6ES5374-2KK21 Memory Card

Engineered for SIMATIC S5 Program and Data Storage

This memory card stores large user programs and configuration data. It provides non-volatile storage for the Siemens 6ES5374-2KK21 unit. You will find this EPROM card in SIMATIC S5 CPUs. Unlike standard memory modules, this version offers 64 KB capacity. It holds complex automation programs for large-scale applications.

Technical Specifications & Physical Dimensions

We designed this memory card for extensive program storage needs. The table below presents all verified technical specifications.

Parameter	Specification
Memory Capacity	64 KB (512 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 Data Organization

This memory card plugs directly into the S5 CPU memory socket. It uses a standard JEDEC pinout for universal compatibility. You cannot rewrite the card without a UV eraser. Moreover, the card features a quartz window for erasure. This window allows ultraviolet light to clear stored data. Consequently, you can reprogram the chip after 20 minutes of UV exposure.

Installation and Operational Guidelines

The Siemens 6ES5374-2KK21 retains data for over 20 years reliably. It requires 12.5V on pin 1 for programming mode. You must align the notch with the socket indicator carefully. Always cover the quartz window with an opaque label after programming. This practice prevents accidental erasure from fluorescent room lighting. Furthermore, the card supports checksum verification during CPU startup. This feature confirms the integrity of stored program data.

Physical Characteristics and Environmental Limits

This memory card features a ceramic body with glass window. Its lightweight 12 gram design allows for easy handling. The layout follows Siemens standard memory module specifications. Therefore, it fits securely into any S5 CPU socket. The card requires no external power for data retention. In addition, it maintains stable operation between 0°C and 70°C ambient temperature. You can store this card safely between -55°C and 125°C.