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Gocator Line Profile Sensors: User Manual
Protocols • 512
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
object,
object, and
k
object. In addition,
are used for sending sensor and sample data and receiving
commands. There are four assembly objects: the command assembly (32 bytes), the runtime variable
configuration assembly (64 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.
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