AS-P840-000 Modicon P840 I/O power supply

The cited source identifies AS-P840-000 as Modicon P840 I/O power supply. The cited source documents that it supplies regulated power to an 800-Series remote I/O drop.

System function and position

Rebuilt from individual evidence

The cited source identifies AS-P840-000 as Modicon P840 I/O power supply.

The cited source documents that it supplies regulated power to an 800-Series remote I/O drop.

Unknown: installation compatibility, wiring, firmware, condition, and replacement suitability for AS-P840-000 require separate evidence.

Exact reference: AS-P840-000
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 power to an 800-Series remote I/O drop
System position: sits in the primary or auxiliary 800-Series housing upstream of the I/O modules
Upstream / inputs: receives 115 or 230 VAC from the control-panel supply
Downstream / outputs: supplies the documented positive and negative DC rails to the I/O housing
Limitations: Unknown: installation compatibility, wiring, firmware, condition, and replacement suitability for AS-P840-000 require separate evidence.

Evidence ledger

Facts, inferences, and unknowns are kept separate.

Facts

The cited source identifies AS-P840-000 as Modicon P840 I/O power supply.
Confidence: high
- www.mroelectric.com — retrieved 2026-09-12; high confidence
The cited source documents that it supplies regulated power to an 800-Series remote I/O drop.
Confidence: high
- www.mroelectric.com — retrieved 2026-09-12; high confidence

Inferences

Inferred system position: sits in the primary or auxiliary 800-Series housing upstream of the I/O modules.
Confidence: medium
Rationale: The documented product function and interfaces establish this system placement.
- www.mroelectric.com — retrieved 2026-09-12; high confidence

Unknowns

Unknown: installation compatibility, wiring, firmware, condition, and replacement suitability for AS-P840-000 require separate evidence.
Confidence: low
Missing evidence: The individual lookup does not establish installed compatibility, wiring, firmware, condition, or replacement fit.

System position diagram

Upstream control sends input to AS-P840-000, which serves its documented role for the downstream machine system. — The AS-P840-000 is shown in its documented system position between upstream control and the downstream machine system.

View Mermaid source

flowchart LR; Upstream[Upstream control] --> Product[AS-P840-000]; Product --> Downstream[Downstream machine system]

View diagram labels

Nodes: Upstream control; AS-P840-000; Downstream machine system
Edges: Controlled input; Documented system output

Next action

The evidence supports the documented role of AS-P840-000; confirm the installed system before replacement or commissioning.

Unknown: confirm installation compatibility, wiring, firmware, condition, and replacement suitability before purchase or installation.

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