Siemens 6ES5350-3KA21 SIMATIC S5 350 RAM/EPROM Memory Module

Features

-8 KB onboard CMOS RAM
-4K-instruction program capacity
-Two plug-in EPROM positions
-Independently configurable memory areas
-Battery-backed RAM operation
-Compact double-height Eurocard format
-Byte- and word-mode configuration
-Two 48-pin base connectors

Product Overview

The Siemens 6ES5350-3KA21 is a compact-format SIMATIC S5 Series 350 memory board used for storing user programs. The base module contains battery-backed CMOS RAM with a capacity of 4K instructions, equivalent to 8 KB, and provides two front-accessible positions for compatible EPROM memory submodules. The 350 memory architecture allows RAM and EPROM areas to be combined on one board. The onboard RAM can hold writable program information, while installed 370, 372 or 373 submodules provide additional EPROM storage. Each memory area has its own address configuration, so the board must be set up according to the controller’s operating mode and complete memory map.

Technical Specifications

Benefits

-Combines writable RAM and EPROM storage on one board
-Allows program-memory capacity to be adapted with plug-in submodules
-Supports separate addressing of RAM and EPROM areas
-Maintains the established SIMATIC S5 memory architecture
-Provides front access to installed memory submodules

Application Areas
SIMATIC S5 User-Program Storage--The onboard 8 KB RAM can store writable user-program information in compatible S5 controllers. Its battery-backed CMOS design retains the RAM contents when the main 5 V supply is interrupted, provided that the host system’s backup circuit is operating correctly.

Industrial Machine Control--The module can support established machinery using S5-130 or S5-150 controllers. Stored programs may manage operating sequences, interlocks, timing functions and coordinated machine actions according to the original system design.

Process and Production Control--In compatible installations, the module can hold program sections used for process sequences, equipment coordination and production-line control. Engineers must preserve the original RAM and EPROM address allocation when changing the board or its submodules.

Frequently Asked Questions

1. How much memory is built into the 6ES5350-3KA21?
The base module contains 8 KB of CMOS RAM, corresponding to 4K instructions. The capacity of any installed EPROM submodules is separate and should not be included when describing the board’s onboard RAM.

2. Are the two EPROM submodules part of the 6ES5350-3KA21 base module?
The article number identifies the 350 memory board with two submodule positions. The exact order contents should state clearly whether either position includes a memory submodule. Do not assume that the two front positions are populated unless this is specified in the quotation.

3. Which memory submodules can be installed?
Siemens documentation identifies the 370, 372 and 373 EPROM submodule families for use with the 350 board. Compatibility also depends on the controller and the exact submodule number. Certain versions require an intermediate adapter, so the complete submodule designation must be checked.