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Communication
Overview
This chapter describes the DeviceNet communication protocol for
the RDNA-01 and the configuration of the scanner. For detailed
information on DeviceNet communication, refer to ODVA
DeviceNet Specifications Release 2.0.
Introduction to DeviceNet
DeviceNet is a protocol based on CAN technology. CAN specifies
the physical layer interface. DeviceNet specifies the wiring, and
the data transfer through CAN.
The RDNA-01 is a device acting as a Group 2 Server realising the
Predefined Master Slave Connection Set functionality. The Off-line
Connection Set functionality and UCMM are not supported.
Object modelling and functional profiles
One of the main features of DeviceNet is object modelling. A
group of objects can be described with a Functional Profile. The
RDNA-01 realises the ODVA AC/DC Drive Functional Profile with
additional features.
Assembly object
I/O Assembly Instances may also be referred to as Block Transfer
of data. Intelligent devices realising a Functional Profile, such as
the RDNA-01, have several objects. Since it is not possible to
transmit more than one object data through a single connection, it
is practical and more efficient to group attributes from different
objects into a single I/O connection (for example a Polled
Connection) using the Assembly object. The Assembly object acts
as a tool for grouping these attributes.
The Assembly selections described above are in fact Instances of
the Assembly object class. The RDNA-01 uses Static assemblies
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Communication
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