Siemens 6ES5340-5AB11 SIMATIC S5 340 RAM Memory Module

Features

-8K-instruction program capacity
-16 KB CMOS RAM
-Rugged module construction
-Battery-backed memory operation
-Hardware-configurable addressing
-Byte- and word-mode support
-Two 48-pin base connectors

Product Overview

The Siemens 6ES5340-5AB11 is a SIMATIC S5 Series 340 RAM memory module used for storing user programs in compatible S5 control systems. It is the rugged-format version with a documented capacity of 8K instructions, equivalent to 16 KB. The module uses CMOS RAM and receives backup power through the battery circuit in the host system’s power supply. Hardware links on the board define its operating mode and memory address range. These settings must correspond with the controller type and the complete RAM and EPROM memory map.

Technical Specifications

Benefits

-Preserves the established S5 memory architecture
-Provides writable storage for program changes
-Supports controller-specific address configuration
-Simplifies like-for-like system maintenance
-Accommodates byte- or word-oriented controller configurations

Application Areas
Industrial Machine Automation--The module can store sequencing, interlocking and equipment-control logic in established machinery. Typical applications include material-handling equipment, assembly machinery, packaging systems and other controller-based production assets.

Process and Plant Control--In compatible S5 systems, the module may hold programs responsible for process sequences, permissive logic, alarm handling and coordinated equipment operation. The existing controller memory map must be retained when the module is installed.

Engineering and Commissioning Systems--The writable RAM structure supports program loading, controlled modifications and fault investigation. Engineers should document all hardware-link positions before changing the module or altering the memory allocation.

Frequently Asked Questions

1. Does the 6ES5340-5AB11 provide 16K instructions?
No. Its stated capacity is 16 KB, which corresponds to 8K instructions. The 6ES5340-5AB21 is the related 32 KB version with a capacity of 16K instructions. These two capacity descriptions should not be treated as interchangeable.

2. How are programs retained when the controller loses its main supply?
The module uses CMOS RAM. During a main-supply interruption, the RAM is supported by the battery circuit in the host power supply. Before maintenance, engineers should check the backup condition and create a verified copy of the controller program.

3. Can the 6ES5340-5AB11 be removed while the controller is powered?
No. Siemens’ instructions state that the memory board must only be inserted or removed after the power supply has been switched off. The program should also be backed up because interrupting the backup path can cause loss of RAM contents.