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The 6ES5375-0LA21 functions as a memory submodule for the Siemens SIMATIC S5 PLC system. This unit expands the user memory capacity of S5 CPUs for larger programs. It plugs directly into a dedicated submodule slot on the processor module. Therefore, this submodule enables complex automation tasks that require extended program storage.
Technical Specifications
We engineered this memory submodule for reliable program and data storage. Its compact design fits into the auxiliary memory slot on S5 CPUs. Moreover, the submodule includes battery backup for retentive data retention.
| Parameter | Specification |
|---|---|
| Dimensions (W x H x D) | 2.4 x 2.0 x 0.5 inches (61 x 51 x 13 mm) |
| Weight | 0.05 kg (0.11 lbs) |
| Memory Type | CMOS RAM with lithium battery backup |
| Memory Capacity | 16 KB (16,384 bytes) |
| Data Retention | 3 years with battery at 25°C |
| Access Time | 120 ns typical |
| Compatible CPUs | S5-115U, S5-135U (with adapter) |
| Battery Type | Lithium 3.6V (soldered onboard) |
| Battery Life | 10 years typical storage life |
| Write Cycles | Unlimited (read/write memory) |
| Operating Temperature | 0°C to 60°C (32°F to 140°F) |
Memory Architecture
The 6ES5375-0LA21 uses CMOS RAM technology for read/write program storage. This submodule allows online program changes without reprogramming EPROMs. The CPU can read from and write to this memory during normal operation. Consequently, you can modify your automation program without stopping the PLC.
Battery Backup and Data Retention
This memory submodule includes a soldered lithium battery for data retention. The battery preserves all program and data during main power loss. Under normal conditions, the battery retains data for approximately three years. Therefore, critical program changes remain safe during extended plant shutdowns.
Program Storage and Flexibility
The 6ES5375-0LA21 stores both the user program and system configuration data. You can make online edits to the program while the CPU continues running. The submodule supports unlimited write cycles for frequent program revisions. Hence, this memory type suits applications where program changes occur regularly.
Compatibility and System Integration
This memory submodule works with S5-115U CPUs and S5-135U systems with adapters. Insert the submodule into the designated memory expansion slot on the CPU. The CPU automatically detects the additional memory on power-up. Therefore, no configuration parameters are necessary for basic operation.
Battery Monitoring and Replacement
The 6ES5375-0LA21 includes a battery monitoring circuit for early warning. The CPU detects low battery voltage and sets a diagnostic flag. Replacement requires soldering a new battery to the submodule circuit board. Consequently, Siemens recommends replacing the entire submodule when the battery fails.
Energy Storage and Power Requirements
This memory submodule draws current from the battery only during power-off periods. During normal operation, the CPU supplies power to the RAM chip. The lithium battery provides backup for approximately 36 months total. Hence, schedule battery replacement every three years for reliable data retention.
Installation and Handling
Mount the 6ES5375-0LA21 into the CPU memory slot with proper orientation. Push the submodule gently until it seats fully in the connector socket. Do not bend the pins during insertion to prevent permanent damage. Store spare submodules in anti-static bags away from heat and humidity. Replace the submodule immediately if the CPU reports a battery low alarm. Always back up your program before removing or replacing this submodule.