PLC Program Storage Solution – Siemens 6ES5375-1LA21 | SIMATIC S5
Where This Product Is Used
The Siemens 6ES5375-1LA21 EPROM Memory Module is a critical program storage component for SIMATIC S5 programmable logic controllers, widely deployed across heavy industry and process automation environments. Engineers specify this module in applications where non-volatile, UV-erasable program memory is required for long-term reliability without battery dependency.
- Automotive Body Shop Automation – Stores welding robot sequencing programs in S5-115U controllers on body-in-white lines
- Chemical Process Plants – Retains batch control logic in hazardous-area cabinets where battery-backed RAM is a maintenance liability
- Discrete Manufacturing Lines – Holds machine cycle programs for stamping, injection molding, and assembly automation
- Water & Wastewater Treatment – Provides stable program storage in remote pump station PLCs with infrequent maintenance access
- Power Generation & Utilities – Used in turbine governor and switchgear control panels requiring decades of operational continuity
- Food & Beverage Processing – Stores CIP (Clean-In-Place) cycle logic in S5 systems operating in washdown environments
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 6ES5375-1LA21 |
| Series | SIMATIC S5 |
| Module Type | EPROM Memory Module |
| Memory Capacity | 64 KB |
| Memory Technology | UV-Erasable EPROM |
| Compatible CPUs | S5-115U, S5-135U, S5-155U |
| Program Retention | Non-volatile (no battery required) |
| Operating Temperature | 0°C to +60°C |
| Storage Temperature | -40°C to +70°C |
| Weight | Approx. 2,100 g (packaged) |
| Country of Origin | Germany |
Why Engineers Specify This Model
- Battery-Free Retention – EPROM technology preserves programs indefinitely without battery maintenance, eliminating data-loss risk during power outages
- Proven S5 Ecosystem Compatibility – Direct plug-in replacement for existing S5-115U/135U/155U installations with no hardware modification
- Long Service Life – UV-erasable design allows reprogramming for machine retooling or process changes, extending asset life
- Reduced Downtime Risk – Stocking a spare 6ES5375-1LA21 eliminates extended lead times when legacy S5 systems require emergency recovery
- Stable Supply via Konmask – Sourced from verified channels with full traceability, critical for MRO procurement in regulated industries
Complete System Bill of Materials
For a complete SIMATIC S5-115U control system, engineers typically specify the following alongside the 6ES5375-1LA21:
- CPU Module – e.g., Siemens 6ES5941-7UB13 (S5-115U CPU)
- Power Supply – e.g., Siemens 6ES5955-3LC41
- Digital Input Module – e.g., Siemens 6ES5421-8MA11
- Digital Output Module – e.g., Siemens 6ES5441-8MA11
- Analog Input Module – e.g., Siemens 6ES5466-3LA11
- Programming Cable – e.g., Siemens 6ES5734-1BD20 (PG cable)
- Rack / Subrack – e.g., Siemens 6ES5700-8MA11
Contact support@konmask.com for bundle pricing on complete S5 system builds.
Compliance & Industry Standards
- Designed and manufactured to IEC 61131-2 PLC hardware requirements
- CE marked for European machinery directive compliance
- Compatible with STEP 5 programming software (v6.x and later)
- Suitable for use in UL-listed industrial control panels (verify local AHJ requirements)
- RoHS status: Legacy component – verify with procurement team for specific project requirements
Quality Assurance & Sourcing
Konmask.com sources the 6ES5375-1LA21 exclusively through verified industrial distributors and authorized refurbishment channels. Every unit undergoes:
- Visual inspection for physical damage, pin integrity, and label authenticity
- Functional verification against Siemens S5 compatibility specifications
- Anti-static packaging with humidity indicator cards for safe transit
- Lot traceability documentation available on request for regulated industries
We do not source from unverified grey-market channels. All inventory is held in climate-controlled storage in accordance with Siemens component handling guidelines.
How to Source This Part
- Add to Cart – Click the purchase button above to place an order directly
- Request a Quote – Email support@konmask.com for volume pricing, lead time confirmation, or datasheet requests
- Urgent MRO – Call or WhatsApp +0086 19859288691 for same-day stock confirmation and expedited shipping options
- OEM / System Integrators – Ask about blanket order agreements and consignment stock programs for high-volume S5 maintenance contracts
Application-Specific FAQ
Q: Can the 6ES5375-1LA21 replace a battery-backed RAM module in my S5-115U?
A: Yes, in most configurations. EPROM modules store the program permanently without power, making them preferable for sites where battery replacement is impractical. Confirm your CPU supports EPROM operation in the S5-115U hardware manual.
Q: How do I erase and reprogram this EPROM module?
A: UV erasure requires a dedicated EPROM eraser (approx. 15–30 minutes exposure). Programming is performed via a Siemens PG programmer or compatible third-party EPROM programmer with the correct S5 memory format.
Q: Is this module compatible with S5-90U or S5-95U CPUs?
A: The 6ES5375-1LA21 is designed for the S5-115U/135U/155U family. Compatibility with S5-90U/95U should be verified against the specific CPU hardware manual before ordering.
Q: What is the typical lead time for this part?
A: In-stock units ship within 1–3 business days. For out-of-stock situations, contact us for sourcing lead time — typically 5–15 business days for verified refurbished stock.
Q: Do you provide a warranty?
A: Yes. Konmask.com provides a 90-day functional warranty on all verified components. Extended warranty options are available for MRO contract customers.
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Contact: support@konmask.com | +0086 19859288691
