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Gocator 2300 & 2880 Series

Protocols • EtherNet/IP Protocol • 348

EtherNet/IP Protocol

EtherNet/IP is an industrial protocol that allows bidirectional data transfer with PLCs. It encapsulates the

object-oriented Common Industrial Protocol (CIP).

This section describes the EtherNet/IP messages and data formats. EtherNet/IP communication enables

the client to:

Switch jobs.

Align and run sensors.

Receive sensor states, stamps, and measurement results.

To use the EtherNet/IP protocol, it must be enabled and configured in the active job.

The Gocator 4.x firmware uses mm, mm

, mm

, and degrees as standard units. In all protocols,

values are scaled by 1000, as values in the protocols are represented as integers. This results in

effective units of mm/1000, mm

/1000, mm

/1000, and deg/1000 in the protocols.

For information on configuring the protocol using the Web interface, see Ethernet Output on page 210.

Concepts

To EtherNet/IP-enabled devices on the network, the sensor information is seen as a collection of objects,

which have attributes that can be queried.

Gocator supports all required objects, such as the Identity object, TCP/IP object, and Ethernet Link

object. In addition, assembly objects are used for sending sensor and sample data and receiving

commands. There are three assembly objects: the command assembly (32 bytes), the sensor state

assembly (100 bytes), and the sample state assembly object (380 bytes). The data attribute (0x03) of the

assembly objects is a byte array containing information about the sensor. The data attribute can be

accessed with the GetAttribute and SetAttribute commands.

The PLC sends a command to start a Gocator. The PLC then periodically queries the attributes of the

assembly objects for its latest measurement results. In EtherNet/IP terminology, the PLC is a scanner

and the Gocator is an adapter.

The Gocator supports unconnected or connected explicit messaging (with TCP). Implicit I/O messaging is

supported as an advanced setting. For more information, see

http://lmi3d.com/sites/default/files/APPNOTE_Implicit_Messaging_with_Allen-Bradley_PLCs.pdf.

The default EtherNet/IP ports are used. Port 44818 is used for TCP connections and UDP queries (e.g.,

list Identity requests). Port 2222 for UDP I/O Messaging is not supported.

LMI Technologies Gocator 2300 Series User Manual

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