HMISTU855 - Schneider Electric Harmony STO and STU color touch panel

HMISTU855 is a Schneider Electric 5.7-inch color touch panel for displaying configured HMI views. Evidence and installation boundaries are recorded for maintenance review.

Documented product role

Rebuilt from individual evidence

System placement

Unknown: Evidence boundary for the captured source set.

Schneider Electric identifies HMISTU855 as a Harmony STO and STU 5.7-inch color touch panel screen.

HMISTU855 displays configured synoptic views and accepts operator touch input.

The panel receives operator touch actions and configured data from its connected controller interface.

The panel presents configured process views and operator controls on its color TFT display.

The panel sits at the operator-facing boundary of the HMI control system.

Controller data is rendered by HMISTU855 while operator touch actions return through the configured HMI interface.

Unknown: The installed project, controller protocol, firmware, screen module revision, and application suitability are not established by the captured sources.

Exact reference: HMISTU855
Category: HMI / Display
Evidence checked: 2026-09-12

System role

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

Function: Displays configured synoptic views and accepts operator touch input.
System position: Sits at the operator-facing boundary of the HMI control system.
Upstream / inputs: Receives touch actions and configured controller data.
Downstream / outputs: Presents configured process views and operator controls.
Limitations: Unknown: The installed project, controller protocol, firmware, screen module revision, and application suitability are not established by the captured sources.

Evidence ledger

Facts, inferences, and unknowns are kept separate.

Facts

Schneider Electric identifies HMISTU855 as a Harmony STO and STU 5.7-inch color touch panel screen.
Confidence: high
- www.se.com — retrieved 2026-09-12; high confidence
HMISTU855 displays configured synoptic views and accepts operator touch input.
Confidence: high
- www.se.com — retrieved 2026-09-12; high confidence
The panel receives operator touch actions and configured data from its connected controller interface.
Confidence: high
- www.se.com — retrieved 2026-09-12; high confidence
The panel presents configured process views and operator controls on its color TFT display.
Confidence: high
- www.se.com — retrieved 2026-09-12; high confidence

Inferences

The panel sits at the operator-facing boundary of the HMI control system.
Confidence: medium
Rationale: Schneider identifies the unit as a touch panel for displaying synoptic views and documents its communication and installation functions.
- www.se.com — retrieved 2026-09-12; high confidence
Controller data is rendered by HMISTU855 while operator touch actions return through the configured HMI interface.
Confidence: medium
Rationale: The documented display purpose and touch-panel role support the operator-to-controller boundary; the installed protocol remains unknown.
- www.se.com — retrieved 2026-09-12; high confidence

Unknowns

Unknown: The installed project, controller protocol, firmware, screen module revision, and application suitability are not established by the captured sources.
Confidence: low
Missing evidence: The installed project, controller protocol, firmware, screen module revision, and application suitability are not established by the captured sources.

System position diagram

Diagram showing HMISTU855 between Controller data and operator touch and Configured synoptic views. — System position of HMISTU855 from the captured evidence.

View Mermaid source

flowchart LR
  upstream[Controller data and operator touch] --> unit[HMISTU855]
  unit --> downstream[Configured synoptic views]

View diagram labels

Nodes: Controller data and operator touch; HMISTU855; Configured synoptic views
Edges: Upstream data enters the product; The product provides the documented downstream function

Next action

Decision: The exact touch-panel identity and operator-facing role are supported by Schneider Electric sources; verify the project and screen-module revision before service.

Next action: verify the installed Vijeo Designer target, screen module, controller protocol, and firmware before sourcing.

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