Siemens 6ES5375-0LA15-Z Memory Submodule

This submodule expands the user memory capacity of your S5 CPU. The Siemens 6ES5375-0LA15-Z plugs directly into the memory slot on compatible processors. It measures 85 mm in width and 55 mm in height. This unit weighs approximately 35 grams for lightweight integration.

Technical Specifications Table

Parameter	Value
Product Model	Siemens 6ES5375-0LA15-Z
Category	Memory Submodule / RAM Expansion
Memory Technology	Static RAM (SRAM)
Storage Capacity	8 KB (8192 bytes)
Memory Width	8-bit parallel interface
Dimensions (W x H x D)	85 mm x 55 mm x 12 mm
Weight	35 g
Connection Type	1 x 40-pin dual-in-line male header
Internal Components	4 x SRAM chips, 1 x lithium battery
Energy Storage	1 x 3.6 V lithium cell (non-rechargeable)
Data Retention Time	Approximately 1 year with battery
Access Time	120 ns maximum

Internal Design and Power Backup

This memory submodule contains four independent SRAM chips on one board. A replaceable lithium battery maintains stored data during power loss. The Siemens 6ES5375-0LA15-Z draws no current from the PLC after installation. Instead, the internal battery powers all memory chips exclusively. This design prevents data corruption during main power interruptions. The battery life typically reaches one year in normal operating conditions.

Installation and Compatibility Guide

First, power down your SIMATIC S5 PLC completely before installation. Next, locate the memory submodule slot on your CPU board. Then, align the 40 pins carefully with the motherboard socket. Press firmly until the submodule seats flush against the connector. The CPU automatically recognizes the additional 8 KB of memory on startup. This submodule works with S5 CPUs 100U, 103U, and 115U models. Always replace the lithium battery once the low voltage warning appears.