Siemens 6ES5375-0LD21 documented industrial automation component

6ES5375-0LD21 is documented by the cited sources as an industrial automation component with a defined function in a Siemens control path.

System function

Rebuilt from individual evidence

Evidence and limits

The Siemens CP 530 manual lists exact 6ES5375-0LD21 as a 16 Kbyte RAM submodule and documents its use for CP 530 parameter and user-memory data.

The exact listing identifies this article as a Siemens memory module and records its product-cancellation status.

The system position is an inference from the exact-reference evidence; installation-specific compatibility remains unknown.

Exact reference: 6ES5375-0LD21
Category: PLC / CPU
Evidence checked: 2026-09-12

System role

This section explains what the product does and where it acts in the surrounding system.

Function: Receives and retains documented S5 program or parameter memory data.
System position: Sits within the S5 memory path between the host module and stored program or parameter data.
Upstream / inputs: The documented upstream source is the matching control, power, memory or operator connection described by the cited evidence.
Downstream / outputs: The documented downstream path receives the module's power, stored data, counted state or operator display function.
Limitations: Unknown: installation-specific compatibility, firmware, wiring, project configuration, condition and commercial status.

Evidence ledger

Facts, inferences, and unknowns are kept separate.

Facts

The Siemens CP 530 manual lists exact 6ES5375-0LD21 as a 16 Kbyte RAM submodule and documents its use for CP 530 parameter and user-memory data.
Confidence: high
- cache.industry.siemens.com — retrieved 2026-09-12; high confidence
- www.santaclarasystems.com — retrieved 2026-09-12; high confidence
The exact listing identifies this article as a Siemens memory module and records its product-cancellation status.
Confidence: high
- cache.industry.siemens.com — retrieved 2026-09-12; high confidence
- www.santaclarasystems.com — retrieved 2026-09-12; high confidence

Inferences

Inferred system position: Sits within the S5 memory path between the host module and stored program or parameter data.
Confidence: high
Rationale: The cited exact-reference identity and function evidence support this system-path description; the placement is explicitly an inference.
- cache.industry.siemens.com — retrieved 2026-09-12; high confidence
- www.santaclarasystems.com — retrieved 2026-09-12; high confidence

Unknowns

Unknown: installation-specific compatibility, firmware, wiring and project configuration.
Confidence: low
Missing evidence: No installation-specific controller, firmware, wiring or project configuration was captured.
Unknown: unit condition, current stock, price, lead time, repair status, warranty and local service coverage.
Confidence: low
Missing evidence: No current unit-specific commercial or condition evidence was captured.

System position diagram

A left-to-right diagram shows the documented upstream path feeding 6ES5375-0LD21, which connects to the documented downstream path. — System role inferred from the cited evidence for 6ES5375-0LD21; installation-specific wiring is not asserted.

View Mermaid source

flowchart LR\n upstream["Documented upstream path"] --> module["6ES5375-0LD21"]\n module --> downstream["Documented downstream path"]

View diagram labels

Nodes: Documented upstream path; 6ES5375-0LD21 component; Documented downstream path
Edges: Documented input or source path; Documented output or service path

Next action

The captured evidence supports a concrete system role for 6ES5375-0LD21; installation-specific compatibility remains an explicit unknown.

Verify the complete 6ES5375-0LD21 marking and the host system documentation before replacement or commissioning.

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