182 EtherNet/IP – Communication protocol
Object modeling and functional profiles
One of the main features of EtherNet/IP is object modeling. A
group of objects can be described with a Functional Profile. The
FENA adapter module realizes the ODVA AC/DC drive Functional
Profile with additional features.
Assembly objects
I/O assembly instances may also be referred to as Block Transfer
of data. Intelligent devices realizing a Functional Profile, such as
FENA, 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 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 adapter module uses static
assemblies (in other words, fixed groupings of different object data
only). The following tables describe the assembly instances
supported by the adapter module.
Basic speed control assembly
The Basic speed control assembly is defined by the ODVA AC/DC
drive profile. The format of the output assembly is:
Instance 20 (ODVA AC/DC profile)
Byte Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
0 Fault
Reset
Run Fwd
1
2 Speed Reference (Low Byte)
3 Speed Reference (High Byte)
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