Siemens 6ES5375-0LC11 Memory Submodule

This memory submodule provides non-volatile storage for Siemens SIMATIC S5 automation systems. It stores user programs and data tables for S5 CPUs. Therefore, it eliminates battery dependency for critical application code preservation.

Physical and Memory Specifications

The Siemens 6ES5375-0LC11 measures 5.5 cm in length and 4.5 cm in width. Moreover, its submodule weight equals approximately 0.02 kg for easy installation. A single 28-pin edge connector interfaces directly with the S5 CPU card. Additionally, this memory submodule uses EPROM technology for permanent data retention.

Parameter	Specification
Brand	Siemens
Full Model	6ES5375-0LC11
Category	Memory Submodule (EPROM)
Dimensions (L x W x H)	5.5 cm x 4.5 cm x 0.8 cm (2.17″ x 1.77″ x 0.31″)
Submodule Weight	0.02 kg (0.04 lbs)
Interface Type	1 x 28-pin Edge Connector
Memory Type	EPROM (UV Erasable)
Memory Capacity	32 kB
Program Storage	32 kB (User Application Code)
Read Access Time	250 ns (Typical)
Write Method	External EPROM Programmer Required
Erasure Method	UV Light (253.7 nm, 15-20 Minutes)
Data Retention	10 Years (Minimum at 25°C)
Battery Requirement	None (Non-Volatile)
Compatible CPUs	S5 95U, 100U, 115U, 135U, 155U
Programming Voltage	12.5 VDC (External Programmer)
On-Board Components	1 EPROM Chip + 1 Write Protection Jumper + 2 Decoupling Capacitors
Energy Storage	2 x 0.1 µF Ceramic Capacitors (Decoupling Only)
Operating Voltage	5 VDC (from CPU Slot)
Power Consumption	0.05 W (Typical)
Operating Temperature	0°C to +55°C (32°F to 131°F)
Storage Temperature	-25°C to +70°C (-13°F to 158°F)
UV Erasure Window	Quartz Glass (Center of Chip)
Write Protection	Jumper (On Submodule PCB)

Memory Architecture and Non-Volatile Storage

The Siemens 6ES5375-0LC11 uses EPROM technology for permanent data retention. Specifically, UV light erases the memory contents through the quartz window. In addition, this memory submodule requires no battery backup for data preservation. Moreover, the submodule retains stored programs for over 10 years without power. Consequently, you can store critical application code safely without periodic battery changes.

Hardware Write Protection and Installation

A hardware jumper on the submodule PCB enables write protection. Specifically, setting the jumper prevents accidental overwrites during operation. In addition, you need an external EPROM programmer to write data to this submodule. Furthermore, the submodule plugs directly into the S5 CPU’s memory socket. Thus, field technicians can replace the submodule without special tools.

UV Erasure and Reprogramming Guidelines

You can erase the Siemens 6ES5375-0LC11 using a standard UV EPROM eraser. For instance, expose the quartz window to 253.7 nm UV light for 15 minutes. In addition, cover the quartz window with an opaque label after programming. Moreover, sunlight and fluorescent light can gradually erase unprotected EPROMs. Therefore, always apply a UV-blocking label after programming this submodule.

Compatibility and Usage Instructions

This memory submodule works with S5 95U, 100U, 115U, 135U, and 155U CPUs. For example, it fits into the memory expansion socket on these processor cards. In addition, the 32 kB capacity stores up to approximately 2000 ladder logic statements. However, do not remove the submodule while the CPU has power applied. Thus, always power down the S5 rack before inserting or extracting this submodule.