Omron NT31C-ST142-EV2 color programmable terminal

The captured NT31/NT631 documentation lists NT31C-ST142-EV2 as a color STN programmable terminal model. The documentation records 320 x 240 display resolution, 24 V DC operation, and serial communication interfaces for the NT31C-ST142-EV2 family.

Documented system function and position

Rebuilt from individual evidence

The captured NT31/NT631 documentation lists NT31C-ST142-EV2 as a color STN programmable terminal model.

The documentation records 320 x 240 display resolution, 24 V DC operation, and serial communication interfaces for the NT31C-ST142-EV2 family.

Sits in the operator panel between the operator and the connected PLC.

Unknown: installed screen project, exact interface wiring, PLC protocol settings, unit condition, and current commercial availability are not established by the captured documentation.

Exact reference: NT31C-ST142-EV2
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 color HMI screens and exchanges control data with a PLC through its serial interface.
System position: Sits in the operator panel between the operator and the connected PLC.
Upstream / inputs: Receives PLC status, data, and screen instructions through the serial interface.
Downstream / outputs: Sends touch actions and terminal data to the PLC.
Limitations: Unknown: installed screen project, exact interface wiring, PLC protocol settings, unit condition, and current commercial availability are not established by the captured documentation.

Evidence ledger

Facts, inferences, and unknowns are kept separate.

Facts

The captured NT31/NT631 documentation lists NT31C-ST142-EV2 as a color STN programmable terminal model.
Confidence: high
- www.nexinstrument.com — retrieved 2026-09-12; high confidence
The documentation records 320 x 240 display resolution, 24 V DC operation, and serial communication interfaces for the NT31C-ST142-EV2 family.
Confidence: high
- www.nexinstrument.com — retrieved 2026-09-12; high confidence

Inferences

Inferred system position: Sits in the operator panel between the operator and the connected PLC.
Confidence: medium
Rationale: The documented product function and interfaces establish the adjacent system stages.
- www.nexinstrument.com — retrieved 2026-09-12; high confidence

Unknowns

Unknown: installed screen project, exact interface wiring, PLC protocol settings, unit condition, and current commercial availability are not established by the captured documentation.
Confidence: low
Missing evidence: installed screen project, exact interface wiring, PLC protocol settings, unit condition, and current commercial availability are not established by the captured documentation.

System position diagram

A flow from Receives PLC status, data, and screen instructions through the serial interface. through NT31C-ST142-EV2 to Sends touch actions and terminal data to the PLC.. — System position inferred from the captured evidence: Sits in the operator panel between the operator and the connected PLC.

View Mermaid source

flowchart LR
  upstream["Receives PLC status, data, and screen instructions through the serial interface."] -->|"documented input"| item["NT31C-ST142-EV2"]
  item -->|"documented output"| downstream["Sends touch actions and terminal data to the PLC."]

View diagram labels

Nodes: Receives PLC status, data, and screen instructions through the serial interface.; Omron NT31C-ST142-EV2 color programmable terminal; Sends touch actions and terminal data to the PLC.
Edges: Documented upstream interface; Documented downstream interface

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