Siemens 6ES5375-8LC11 Memory Submodule

Physical Dimensions and Mechanical Layout

The Siemens 6ES5375-8LC11 stores program logic and data for S5 processors. This submodule measures 65mm in height, 25mm in width, and 10mm in depth. You can insert this unit into any S5 CPU memory slot without tools. The submodule weighs just 0.02 kilograms , making it extremely lightweight.

Internal Architecture and Component Density

The Siemens 6ES5375-8LC11 contains 24 individual components on its compact PCB. Eight EPROM chips provide non-volatile storage for user application programs. Two CMOS RAM chips handle variable data and system flags during operation. A lithium backup battery preserves RAM contents when the system powers down.

Energy Storage and Data Retention

This memory submodule stores 28.8 joules in its lithium backup battery. The battery maintains RAM data integrity for up to 200 days without external power. The submodule also includes two ceramic capacitors that filter power supply noise. Consequently, your program and data remain safe during extended system shutdowns.

Parameter	Value	Unit
Dimensions (H x W x D)	65 x 25 x 10	mm
Weight	0.02	kg
Total components	24	pieces
EPROM memory chips	8	units
CMOS RAM chips	2	units
Lithium backup battery	1	unit
Ceramic filter capacitors	2	units
Total battery energy storage	28.8	J
RAM data retention time	200	days
EPROM capacity	32	KB
RAM capacity	4	KB
Total memory	36	KB
Memory access time	200	ns
Operating voltage	5	V DC
Active current draw	15	mA
Standby current draw	1	µA
Operating temperature	0 to 60	°C
Storage temperature	-20 to 70	°C
Compatible CPU models	S5-115U, 135U, 155U	–

Interface and Connectivity Features

The Siemens 6ES5375-8LC11 provides 34 gold-plated edge connectors for CPU interface. A polarization notch prevents incorrect insertion into the memory slot. The submodule uses zero insertion force for easy removal and replacement. The PCB includes locking tabs that snap into place for secure retention.

Memory Organization and Addressing

This submodule partitions its 36KB into program blocks and data blocks. The EPROM section holds user program logic that does not change during operation. The RAM section stores flags, timers, counters, and variable values dynamically. The CPU accesses both memory types with a 200ns access time for fast execution.

Program Storage and Transfer

You can program the Siemens 6ES5375-8LC11 using a standard EPROM programmer with an adapter. The submodule accepts STEP 5 object code downloaded from a programming device. You can copy program data between two submodules using a CPU function. The unit supports firmware updates without replacing the entire submodule.

Battery Backup and Monitoring

The internal lithium battery automatically backs up RAM during power-off conditions. This battery has a 10-year shelf life under normal storage conditions. A battery monitoring circuit warns the CPU when voltage drops below 2.5V. The CPU then sets a system flag that you can monitor in your user program.

Compatibility and System Integration

This memory submodule works with S5-115U, S5-135U, and S5-155U CPU models. You must install this submodule in the designated memory slot of the selected CPU. The unit supports programs up to 36KB depending on CPU model limits. The submodule requires no configuration after installation.

Environmental Specifications and Compliance

You can operate this memory submodule from 0°C to 60°C ambient temperature without derating. Storage temperature ranges from -20°C to 70°C for long-term preservation. Non-condensing humidity tolerance spans 10% to 90% for industrial environments. This unit meets DIN 19240 standards for programmable controller memory components.