Omron NT20S-ST121-V1 programmable terminal

The official Omron Support Tool manual lists NT20S-ST121-V1 as a supported NT20S programmable terminal model. The manual lists host link and NT link communication for the NT20S-ST121-V1 model family.

Documented system function and position

Rebuilt from individual evidence

The official Omron Support Tool manual lists NT20S-ST121-V1 as a supported NT20S programmable terminal model.

The manual lists host link and NT link communication for the NT20S-ST121-V1 model family.

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

Unknown: installed screen project, PLC model compatibility, unit condition, and current commercial availability are not established by the manual.

Exact reference: NT20S-ST121-V1
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 operator screens and exchanges control data with its connected PLC over the supported link.
System position: Sits in the operator panel between the operator and the connected PLC.
Upstream / inputs: Receives PLC status and control data through host link or NT link.
Downstream / outputs: Sends operator actions and terminal data to the PLC through the configured link.
Limitations: Unknown: installed screen project, PLC model compatibility, unit condition, and current commercial availability are not established by the manual.

Evidence ledger

Facts, inferences, and unknowns are kept separate.

Facts

The official Omron Support Tool manual lists NT20S-ST121-V1 as a supported NT20S programmable terminal model.
Confidence: high
- www.omron.com.au — retrieved 2026-09-12; high confidence
The manual lists host link and NT link communication for the NT20S-ST121-V1 model family.
Confidence: high
- www.omron.com.au — 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.omron.com.au — retrieved 2026-09-12; high confidence

Unknowns

Unknown: installed screen project, PLC model compatibility, unit condition, and current commercial availability are not established by the manual.
Confidence: low
Missing evidence: installed screen project, PLC model compatibility, unit condition, and current commercial availability are not established by the manual.

System position diagram

A flow from Receives PLC status and control data through host link or NT link. through NT20S-ST121-V1 to Sends operator actions and terminal data to the PLC through the configured link.. — 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 and control data through host link or NT link."] -->|"documented input"| item["NT20S-ST121-V1"]
  item -->|"documented output"| downstream["Sends operator actions and terminal data to the PLC through the configured link."]

View diagram labels

Nodes: Receives PLC status and control data through host link or NT link.; Omron NT20S-ST121-V1 programmable terminal; Sends operator actions and terminal data to the PLC through the configured link.
Edges: Documented upstream interface; Documented downstream interface

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