Description

Product Overview

The Siemens 6ES5375-1LA41 is a SIMATIC S5 Series Memory Submodule (Module 375 format) built on CMOS EPROM technology, delivering 32 KB of non-volatile program storage for mid-range S5 compact PLC platforms including the S5-95U, S5-100U, and S5-115U. As part of Siemens’ mature yet widely deployed SIMATIC S5 ecosystem, the 6ES5375-1LA41 sits in the dedicated memory submodule slot on the CPU front face, providing a battery-independent, read-only program repository once the EPROM has been UV-erased and re-burned via a Siemens PG (Programming Device) such as the PG 740/PG 750 or a compatible EPROM adapter.Positioned as a critical sparing and lifecycle-extension component for legacy automation installations, the Siemens 6ES5375-1LA41 addresses one of the most persistent pain points of ageing S5 systems: unexpected program loss caused by backup-battery depletion in RAM-based configurations. By migrating fixed function blocks, safety logic, or entire application code onto the 6ES5375-1LA41, plant engineers gain permanent data retention that survives power-down, transport, and long-term storage—making it an essential spare for maintenance teams supporting water treatment, building materials, power plant auxiliary systems, and other sectors where S5 hardware remains in active service.The submodule itself draws 5 V DC from the CPU backplane, operates reliably from 0 °C to +60 °C, and carries an IP20 rating for control-cabinet mounting. Its compact form factor does not consume a rack slot, and once programmed it behaves as true read-only memory until deliberately erased under ultraviolet light through the epoxied erase window.

Technical Specifications

Parameter	Value
Product Model	6ES5375-1LA41
Manufacturer	Siemens AG
Product Type	Memory Submodule (CMOS EPROM)
Series	SIMATIC S5 – Module 375
Memory Capacity	32 KB (16-bit word organization)
Memory Technology	CMOS EPROM, UV-erasable
Operating Voltage	5 V DC (via CPU backplane)
Operating Temperature	0 °C to +60 °C
Storage Temperature	–40 °C to +70 °C
Data Retention	Non-volatile, permanent (no battery required)
Erase / Reprogram	UV window erase (~15–20 min); PG-device burn
Mounting	Plugs into CPU front-face memory slot
Protection Class	IP20 (control cabinet)
Compliance	CE, IEC 61131, ESD IEC 61340

Main Features and Advantages

Battery-independent program permanence. The defining advantage of the Siemens 6ES5375-1LA41 is its EPROM architecture: once the control program or function blocks are burned in, they remain intact indefinitely without any backup power source. In legacy S5 racks where the primary RAM work memory relies on a failing lithium backup battery, keeping a copy of the validated application code on a 6ES5375-1LA41 eliminates the “battery-dead, program-gone” nightmare that has grounded countless production lines over the past two decades.Seamless S5 ecosystem integration. The 6ES5375-1LA41 is purpose-built for the Module 375 memory slot found on S5-95U, S5-100U, and S5-115U CPUs. No rack slot is consumed, no wiring changes are needed—engineers simply insert the submodule into the CPU front, burn via PG, and the system boots from stable, verified code. For mixed configurations where some blocks are volatile (RAM) and some are fixed (EPROM), the submodule allows a tiered memory strategy that balances flexibility with resilience.Low-power, industrial-grade CMOS construction. Drawing minimal current from the 5 V backplane, the Siemens 6ES5375-1LA41 contributes negligible thermal load even in densely populated cabinets. The CMOS process also improves noise immunity compared to older NMOS EPROM generations, an often-overlooked advantage in electrically noisy motor-control or drive-adjacent enclosures.Lifecycle continuity for obsolete plants. Although SIMATIC S5 is officially phased out, thousands of installations worldwide still run mission-critical processes on it because “if it works, don’t migrate.” The 6ES5375-1LA41 is the go-to spare for maintenance stockpiles, disaster-recovery kits, and long-term asset-optimization programs where a sudden S5 failure would trigger unplanned downtime measured in days rather than hours.