Omron NT600S-ST121B-V1 operator terminal

The Omron NT600S manual identifies NT600S-ST121B-V1 as an NT600S programmable terminal variant. The manual records host link, NT Link 1:1 or 1:N, and RS-232C communication, 24 V DC power, and front protection equivalent to IP65 and NEMA 4.

Documented system function and position

Rebuilt from individual evidence

The Omron NT600S manual identifies NT600S-ST121B-V1 as an NT600S programmable terminal variant.

The manual records host link, NT Link 1:1 or 1:N, and RS-232C communication, 24 V DC power, and front protection equivalent to IP65 and NEMA 4.

Sits in the operator panel between the operator and the PLC or host system.

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

Exact reference: NT600S-ST121B-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 PLC and host status and sends touch input to the connected control system.
System position: Sits in the operator panel between the operator and the PLC or host system.
Upstream / inputs: Receives status and screen data from the PLC or host through the supported serial methods.
Downstream / outputs: Sends touch-switch and numeric input to the PLC or host.
Limitations: Unknown: installed screen project, PLC protocol settings, unit condition, and current commercial availability are not established by the manual.

Evidence ledger

Facts, inferences, and unknowns are kept separate.

Facts

The Omron NT600S manual identifies NT600S-ST121B-V1 as an NT600S programmable terminal variant.
Confidence: high
- edata.omron.com.au — retrieved 2026-09-12; high confidence
The manual records host link, NT Link 1:1 or 1:N, and RS-232C communication, 24 V DC power, and front protection equivalent to IP65 and NEMA 4.
Confidence: high
- edata.omron.com.au — retrieved 2026-09-12; high confidence

Inferences

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

Unknowns

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

System position diagram

A flow from Receives status and screen data from the PLC or host through the supported serial methods. through NT600S-ST121B-V1 to Sends touch-switch and numeric input to the PLC or host.. — System position inferred from the captured evidence: Sits in the operator panel between the operator and the PLC or host system.

View Mermaid source

flowchart LR
  upstream["Receives status and screen data from the PLC or host through the supported serial methods."] -->|"documented input"| item["NT600S-ST121B-V1"]
  item -->|"documented output"| downstream["Sends touch-switch and numeric input to the PLC or host."]

View diagram labels

Nodes: Receives status and screen data from the PLC or host through the supported serial methods.; Omron NT600S-ST121B-V1 operator terminal; Sends touch-switch and numeric input to the PLC or host.
Edges: Documented upstream interface; Documented downstream interface

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