Siemens 6ES5420-8MA11 SIMATIC S5 DI 420 digital input module

Siemens 6ES5420-8MA11 SIMATIC S5 DI 420 digital input module is documented for the stated industrial system role.

System function

Rebuilt from individual evidence

System position

Siemens SIMATIC S5 DI 420 digital input module.

Receives four field on/off states through 4 non-isolated 24 V DC digital inputs for the listed legacy systems.

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

Unknown: wiring polarity, signal conditioning, installed hardware condition, and compatibility with a particular rack.

Exact reference: 6ES5420-8MA11
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 four field on/off states through 4 non-isolated 24 V DC digital inputs for the listed legacy systems.
System position: sits between field sensors and the S5 controller input image in the discrete input layer.
Upstream / inputs: Receives four 24 V DC on/off signals from field sensors or contacts.
Downstream / outputs: Exposes the four input states to the S5 controller.
Limitations: Unknown: wiring polarity, signal conditioning, installed hardware condition, and compatibility with a particular rack.

Evidence ledger

Facts, inferences, and unknowns are kept separate.

Facts

Siemens SIMATIC S5 DI 420 digital input module.
Confidence: high
- sps-service.eu — retrieved 2026-09-12; high confidence
Provides 4 non-isolated 24 V DC digital inputs for S5-90U, S5-95U, S5-100U, ET100U, and ET200U systems.
Confidence: high
- sps-service.eu — retrieved 2026-09-12; high confidence

Inferences

Inferred system position: sits between field sensors and the S5 controller input image in the discrete input 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.
- sps-service.eu — retrieved 2026-09-12; high confidence

Unknowns

Unknown: wiring polarity, signal conditioning, installed hardware condition, and compatibility with a particular rack.
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 6ES5420-8MA11 SIMATIC S5 DI 420 digital input 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["6ES5420-8MA11"]; Module-->Downstream["Downstream field layer"]

View diagram labels

Nodes: Upstream system; 6ES5420-8MA11 SIMATIC S5 DI 420 digital input 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 6ES5420-8MA11.

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

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