Siemens 6ES5340-5AB11 – Memory Module for SIMATIC S5 CPU Storage

The Siemens 6ES5340-5AB11 expands the program memory capacity of S5 central processing units. This memory module measures 250 mm in depth and 25 mm in width. It fits standard SIMATIC S5 rack slots without any modifications. The unit weighs 0.39 kg, making installation quick and straightforward.

Storage Capacity and Memory Architecture

This memory module provides 32 kB of additional program storage for the host CPU. The Siemens 6ES5340-5AB11 uses CMOS RAM technology with battery backup protection. A replaceable lithium battery retains data for up to two years without power. The module stores user programs, function blocks, and system configuration data. It supports both read and write operations from the central processor.

Internal Component Layout and Design

The module contains three separate integrated circuits on its single main board. One chip holds the RAM array, while another manages address decoding. The third chip handles data buffering and bus interfacing. The Siemens 6ES5340-5AB11 includes a 48-pin edge connector for backplane communication. The module stores 47 µF of capacitance for power supply filtering only.

Battery Monitoring and Data Integrity

The Siemens 6ES5340-5AB11 includes a low-battery detection circuit on its board. This circuit lights a red LED when battery voltage falls below safe levels. A write-protect jumper prevents accidental program erasure during maintenance. The module automatically switches to battery power when backplane voltage drops. It generates a hardware interrupt when battery voltage reaches critical levels.

Power Consumption and Environmental Tolerance

The Siemens 6ES5340-5AB11 draws 100 mA at 5V DC from the backplane supply. It draws only 5 µA from the backup battery during power-off conditions. The module operates reliably from 0°C to 60°C ambient temperature. It tolerates humidity levels up to 95 percent without any condensation issues. The unit withstands vibration up to 2g from 10 to 500 Hz.

Below is a complete summary of its technical specifications.

The Siemens 6ES5340-5AB11 replaces older EPROM-based memory modules in S5 systems. You do not need any special programmer or UV eraser for this module. This unit also supports in-system programming without removing it from the rack. Consequently, it provides flexible program storage for complex automation tasks.