Siemens 6ES5373-0AA81 Memory Module for SIMATIC S5 PLC Systems

The 6ES5373-0AA81 is a dedicated memory submodule for the SIMATIC S5 series. This unit provides reliable firmware storage for legacy PLC systems. It supports CMOS EPROM technology for non-volatile program retention. You can use this module to restore or expand your S5 CPU’s memory capacity.

Key Technical Parameters

We have listed the critical technical specifications below. These values define compatibility and performance limits. Always verify these parameters against your existing system configuration.

This module supports a 64 KByte storage capacity, which suits medium-scale control logic. The CMOS EPROM design ensures data retention without continuous power. Its compact dimensions allow direct insertion into the CPU or expansion unit.

Technical Overview and Installation

The 6ES5373-0AA81 acts as a firmware or program carrier for the S5 series. First, turn off all power to the PLC rack before handling the module. Then, align the submodule carefully with its designated socket on the CPU. Press firmly until the locking mechanism engages fully. This unit stores your control program permanently, eliminating the need for a backup battery for memory retention. However, remember that EPROM chips require a UV eraser for reprogramming. Consequently, treat this module as a finalized code storage device.

Physical and Interface Characteristics

The interface uses a standard edge connector for the S5 backplane bus. Weighing only 0.10 kg, this lightweight component does not stress the chassis. Its small footprint also allows placement in crowded racks. The 6ES5373-0AA81 does not contain volatile RAM or a battery. Therefore, it offers high reliability in fluctuating temperature environments. Use this module to store boot code or critical machine sequences securely.