Does Nodlyn support Modbus TCP?

Compatibility answer

Yes — at the protocol level. Nodlyn can discover Modbus TCP endpoints and register them for visual workflows.

Nodlyn can scan a subnet for Modbus TCP listeners (port 502) and help you add them to a workflow.

What Modbus TCP support means in Nodlyn

Modbus TCP is still the default language on many plant floors: PLCs, energy meters, and protocol gateways expose holding and input registers over port 502. Nodlyn treats that as a first-class discovery target — scan a subnet, accept a host, then map registers into thresholds, Influx/SQLite logs, or Slack alerts without writing a poller.

If your PLC only speaks Modbus RTU on RS-485, use a TCP gateway or the Serial connector and keep the same visual workflow pattern. Compatibility here means register read/write in Studio and runtime agents — not a replacement for your PLC program.

This page is a compatibility check (supported or not, how you connect). Step-by-step tutorials live on the blog when linked below — so Google (and readers) get one clear “how-to” URL.

Example automations with Modbus TCP

• PLC register → threshold → Slack/SMS
• Energy meter → InfluxDB/SQLite log
• Gateway poll → runtime agent on edge PC

Quick start for Modbus TCP

1. Open Discovery → Industrial & building automation (or Advanced → Modbus).
2. Set your LAN subnet (e.g. 192.168.1.0/24) and start a scan.
3. Accept a found device, or drop a Modbus TCP node and enter the PLC IP manually.
4. Map holding/input registers and connect thresholds, logs, or alerts.

Brands people ask about for Modbus TCP

Curated examples — not an exhaustive SKU database. Same protocol family usually wires the same way. Missing model? Request confirmation on /protocols.

• Schneider Modicon
• ABB
• Wago
• Unitronics
• Generic Modbus gateway

Can Nodlyn auto-discover Modbus TCP devices?

Yes. Nodlyn can scan a subnet for Modbus TCP listeners (port 502) and help you add them to a workflow. You can also add endpoints manually if discovery is empty.

In-depth Modbus TCP guide (blog)

For configuration details, examples, and troubleshooting, use the long-form guide — that URL is the primary “how to” page: Device Discovery: Matter, Zigbee, Z-Wave, CAN Bus & More.

Related protocols