EtherNet/IP

Category

Industrial

Kind

source

Capabilities

StreamsAssetsCommandsOperationsEntities

Runs on

Linux x64Linux ARM64macOS Apple siliconmacOS IntelWindows x64

Read and write tags by name on Allen-Bradley CompactLogix and ControlLogix PLCs over EtherNet/IP.

#What you get

• Live tags — each tag you list, such as Program:Main.Speed, is a channel.
• Setpoints — only on tags you declare writable, with their type. A typo cannot write the wrong tag. Each write is read back.
• One PLC per input, named by its Device name. Channels read /ethernetip/plc1/….

#Setup

1. Put the PLC on the network and note its address. The standard EtherNet/IP port is 44818.
2. In Inputs, add Allen-Bradley PLCs and fill in:
   • Device name — a short label, e.g. plc1
   • Connection — 192.168.1.100:44818
   • Read tags — Program:Main.Speed, MotorRunning
   • Write tags — Program:Main.SetPoint:dint, RunCmd:bool (name:type — bool, sint, int, dint, lint, usint, uint, udint, ulint, real, or lreal)
   • Poll rate — e.g. 1
3. Press Test connection. It reads the first tag you listed. A failure names the address it could not reach.
4. Tags appear on Live. Write tags are available in Trellis. In the Channels table, give a tag a name and unit, such as Program:Main.Speed → line speed, m/min.

#Notes

• A value that does not fit the declared type is refused, never cut short.
• Every write is recorded.

#Supports

• Allen-Bradley CompactLogix / ControlLogix PLCs via EtherNet/IP (tag read/write)

#Connection fields

Every field the Add input form shows for this connector.

Updated November 6, 2026