SIEMENS 6ES5377-0BA31 EEPROM Memory Submodule for SIMATIC S5-135U/S5-155U PLC Systems

Product Overview

The SIEMENS 6ES5377-0BA31 is a high-capacity EEPROM memory submodule designed for the SIMATIC S5 programmable logic controller (PLC) family, specifically engineered to provide reliable, battery-free program and data storage for large-scale industrial automation systems. As a 32 KB (32K x 8 bit) electrically erasable programmable read-only memory module, the SIEMENS 6ES5377-0BA31 offers a permanent storage solution that eliminates the maintenance burdens associated with battery-backed RAM modules and the cumbersome ultraviolet erasure process of traditional EPROMs. This advanced memory submodule is primarily intended for use with S5-135U and S5-155U CPU platforms, which represent the high-performance tier of the SIMATIC S5 product line.

The SIEMENS 6ES5377-0BA31 leverages EEPROM technology to deliver exceptional data retention characteristics, ensuring that critical user programs, configuration parameters, and data blocks remain intact indefinitely without requiring any backup power source. Unlike its RAM counterpart 6ES5375-0LD31, which relies on a battery to maintain data during power interruptions, the SIEMENS 6ES5377-0BA31 stores information through physical charge trapping in the memory cells, guaranteeing permanent data preservation. The electrical erase and write capability of the SIEMENS 6ES5377-0BA31 allows engineers to modify stored programs directly through the programming device (PG) or PLC system functions, eliminating the need for module removal or specialized ultraviolet erasing equipment. As the original SIMATIC S5 product line has been discontinued, the SIEMENS 6ES5377-0BA31 serves as a critical spare part for maintaining legacy automation installations that continue to operate in numerous industrial facilities worldwide.

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Description

Technical Specifications

Parameter Name	Value
Product Model	SIEMENS 6ES5377-0BA31
Manufacturer	Siemens
Product Type	EEPROM Memory Submodule
Platform	SIMATIC S5
Memory Capacity	32 KB (32K x 8 bit)
Memory Technology	EEPROM (Electrically Erasable Programmable Read-Only Memory)
Data Retention	Permanent (no battery required, 10+ years data retention)
Erase Method	Electrical erase via STEP 5 programming software
Write Cycle Endurance	10,000 write/erase cycles (typical)
Compatibility	SIMATIC S5-135U, S5-155U (select S5-115U high-end configurations)
Operating Temperature	0°C to +60°C
Storage Temperature	-40°C to +70°C
Protection Rating	IP20 (installed within CPU module slot)
Installation	Direct plug-in to CPU front memory slot
Programming Equipment	Siemens PG (e.g., PG750) or PC with STEP 5 + interface
Weight	0.086 kg

Main Features and Advantages

Battery-Free Permanent Data Storage: The most significant advantage of the SIEMENS 6ES5377-0BA31 is its complete elimination of battery dependency. Traditional RAM modules require periodic battery replacement to prevent data loss, creating maintenance burdens and risks of program corruption if battery replacement is neglected. The SIEMENS 6ES5377-0BA31 stores program data through non-volatile EEPROM technology, ensuring that critical control logic and parameters remain intact indefinitely without any power source, providing true “install and forget” reliability .

Convenient Electrical Erase and Programming: Unlike EPROM modules that require physical removal and 20-minute ultraviolet exposure for erasure, the SIEMENS 6ES5377-0BA31 supports rapid in-system electrical erasing and writing. Engineers can connect a programming device directly to the PLC system and complete the erasure and rewrite process within seconds . This convenience dramatically reduces system downtime during program modifications and eliminates the need for specialized UV erasing equipment, making the SIEMENS 6ES5377-0BA31 ideal for applications requiring frequent process optimization or parameter adjustments.

Substantial Storage Capacity: With 32 KB of memory capacity, the SIEMENS 6ES5377-0BA31 provides ample storage for complex control logic programs, extensive data blocks, and multiple subroutines typical of large-scale S5-135U and S5-155U applications . This capacity ensures that even the most demanding automation tasks can be supported without memory constraints, enabling sophisticated control strategies including PID loops, sequencing, and interlocking logic.

Industrial-Grade Reliability: Built to Siemens’ rigorous quality standards, the SIEMENS 6ES5377-0BA31 demonstrates exceptional resistance to vibration, temperature variation, and electromagnetic interference common in industrial environments . The module operates reliably across a broad temperature range of 0°C to +60°C, ensuring consistent performance in factory floors, process plants, and outdoor installations.