ABB FDNA-01, Руководство пользователя

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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)