98 Communication protocol
Assembly objects
I/O assembly instances may also be referred to as Block Transfer
of data. Intelligent devices realizing a Functional Profile, such as
FDNA-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 FDNA-01 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:
The format of the input assembly is:
Instance 20
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)
Instance 70
Byte Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
0 Running1
(Fwd)
Faulted
1
2 Speed Actual (Low Byte)
3 Speed Actual (High Byte)
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