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:
l
Switch jobs.
l
Align and run sensors.
l
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
2
, mm
3
, 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
2
/1000, mm
3
/1000, and deg/1000 in the protocols.
For information on configuring the protocol using the Web interface, see
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.
Содержание Gocator 2300 Series
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