Siemens 6ES5458-7LC11 SIMATIC S5 458 isolated relay output module

Siemens 6ES5458-7LC11 SIMATIC S5 458 isolated relay output module is documented for the stated industrial system role.

System function

Rebuilt from individual evidence

System position

Siemens SIMATIC S5 458 relay output module for 230 V UC systems.

Controls isolated relay switching through 16 galvanically isolated relay outputs, arranged in groups of four, with a 24 V DC relay supply.

The system position is an inference from the documented component function and adjacent interfaces.

Unknown: installation load, terminal wiring, protection devices, installed hardware condition, and rack compatibility.

Exact reference: 6ES5458-7LC11
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: Controls isolated relay switching through 16 galvanically isolated relay outputs, arranged in groups of four, with a 24 V DC relay supply.
System position: sits between S5-115U output logic and field loads in the galvanically isolated relay output layer.
Upstream / inputs: Receives discrete output states from the S5-115U controller.
Downstream / outputs: Switches connected AC or DC field loads through relay contacts.
Limitations: Unknown: installation load, terminal wiring, protection devices, installed hardware condition, and rack compatibility.

Evidence ledger

Facts, inferences, and unknowns are kept separate.

Facts

Siemens SIMATIC S5 458 relay output module for 230 V UC systems.
Confidence: high
- cache.industry.siemens.com — retrieved 2026-09-12; high confidence
Provides 16 galvanically isolated relay outputs, arranged in groups of four, with a 24 V DC relay supply.
Confidence: high
- cache.industry.siemens.com — retrieved 2026-09-12; high confidence

Inferences

Inferred system position: sits between S5-115U output logic and field loads in the galvanically isolated relay output layer.
Confidence: high
Rationale: The exact-reference evidence establishes the component identity and documented function; its relationship to adjacent system layers is therefore marked as an inference.
- cache.industry.siemens.com — retrieved 2026-09-12; high confidence

Unknowns

Unknown: installation load, terminal wiring, protection devices, installed hardware condition, and rack compatibility.
Confidence: low
Missing evidence: The individual lookup does not capture the installed unit, wiring, configuration, or site-specific compatibility.

System position diagram

A system diagram places Siemens 6ES5458-7LC11 SIMATIC S5 458 isolated relay output module between the upstream system and downstream field layer; the placement is marked as an inference. — The component position is inferred from its documented function and the adjacent system layers.

View Mermaid source

flowchart LR; Upstream["Upstream system"]-->Module["6ES5458-7LC11"]; Module-->Downstream["Downstream field layer"]

View diagram labels

Nodes: Upstream system; 6ES5458-7LC11 SIMATIC S5 458 isolated relay output module; Downstream field layer
Edges: Documented signal or power path; Inferred system connection

Next action

The captured evidence supports the exact identity and documented system role for 6ES5458-7LC11.

Confirm the target rack, wiring, load, configuration, and installed condition before replacement or commissioning.

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