Siemens 6ES7405-0DA00-0AA0 PS 405 4A power supply module

The Siemens 6ES7405-0DA00-0AA0 PS 405 4A power supply module is a 4 A PS 405 power supply for S7-400 modules.

System function

Rebuilt from individual evidence

System position

Evidence and limits

6ES7405-0DA00-0AA0 is identified in the source as a SIMATIC S7-400 PS 405 4A power supply module for a 24 V DC input network.

Supplies regulated DC power for the S7-400 backplane and connected module electronics.

System position: in the S7-400 rack upstream of the CPU and I/O modules.

Unknown: the installed input wiring, battery option, load level, protection settings, and physical condition are not established by the source.

Exact reference: 6ES7405-0DA00-0AA0
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: Supplies regulated DC power for the S7-400 backplane and connected module electronics.
System position: Sits in the S7-400 rack upstream of the CPU and I/O modules.
Upstream / inputs: The 24 V DC network provides the power supply input.
Downstream / outputs: The S7-400 backplane and connected CPU and I/O modules receive regulated DC power.
Limitations: Unknown: the installed input wiring, battery option, load level, protection settings, and physical condition are not established by the source.

Evidence ledger

Facts, inferences, and unknowns are kept separate.

Facts

The source identifies 6ES7405-0DA00-0AA0 as a SIMATIC S7-400 PS 405 4A power supply module for a 24 V DC input network.
Confidence: high
- support.industry.siemens.com — retrieved 2026-09-12; high confidence
The source documents that 6ES7405-0DA00-0AA0 supplies regulated DC power for the S7-400 backplane and connected module electronics.
Confidence: high
- support.industry.siemens.com — retrieved 2026-09-12; high confidence

Inferences

Inference: 6ES7405-0DA00-0AA0 occupies this system position: in the S7-400 rack upstream of the CPU and I/O modules.
Confidence: medium
Rationale: The source identifies the exact reference and documents its interfaces or rack relationship.
- support.industry.siemens.com — retrieved 2026-09-12; high confidence

Unknowns

Unknown: the installed input wiring, battery option, load level, protection settings, and physical condition are not established by the source.
Confidence: low
Missing evidence: The source describes the product design, not the installed unit, configuration or physical condition.

System position diagram

A system path places 6ES7405-0DA00-0AA0 between an upstream system and a downstream system. — The source-supported position of 6ES7405-0DA00-0AA0 connects the upstream system to the downstream system.

View Mermaid source

flowchart LR
  upstream["Upstream system"] --> product["6ES7405-0DA00-0AA0"]
  product --> downstream["Downstream system"]

View diagram labels

Nodes: Upstream system; 6ES7405-0DA00-0AA0; Downstream system
Edges: Documented signal or power path; System connection

Next action

The evidence supports a concrete system role for 6ES7405-0DA00-0AA0.

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