Eaton Power XL SmartWire-DT DX-NET-SWD Series, Руководство пользователя

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4 Commissioning
4.5 Acyclic data
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4.5.4.4 SmartWire-DT write request – Write job
Only individual parameter writing is supported (i.e., array and multiple
parameter writing is not supported). The maximum parameter request frame
length is set at 16 bytes. The maximum length of a writable parameter is one
double word. Various objects can be transmitted in the parameter channel –
these objects are identified by what is referred to as a PNU (parameter
number) and a subindex.
The write request includes a declaration that specifies that the job is a write
job.
Byte Designation Description
0 Request Reference Request identification
Unique identification for a request/response pair for the master.
The master can increment the identification number for each new
request in the application. They are ten mirrored by variable
frequency drive/variable speed starter.
01
hex
- FF
hex
(i. e. 1
dec
- 255
dec
)
1 Request ID Request ID
Specifies the type of request.
02
hex
: Write job
2 DO-ID Drive-Object-ID
00
hex
3 No. of Paramters Number of Parameters
Only individual parameter processing is supported.
01
hex
4 Attribute Attribute
Defines which object type should be accessed.
10h
ex
(16
dez
): Value
5 No. of Elements Number of elements
Address of the parameter that should be accessed
PNU 0 up to PNU 999: 00
hex
(only for subindex 0)
PNU 0 up to PNU 999: 01
hex
6, 7 Parameter number Parameter number (PNU)
Address of the parameter that should be accessed
0000
hex -
FFFF
hex
(i. e. 0
dec
- 65535
dec
)
8, 9 Subindex Subindex
Address of the parameter's first field element or start of the text
0000
hex
- FFFF
hex
(i. e. 0
dec
- 65535
dec
)
10 Format Format
01
hex
- 7C
hex
(i.e., 01
dec
- 124
dec
): Data types
11 No. of Values Number of values
Number of values being accessed.
01
hex
12 – (15) Value Value
The value of the parameter being accessed
The length depends on the format and can be a maximum of 4 bytes.
00000000
hex
- FFFFFFFF
hex
(i. e. 0
dec
- 4294967295
dec
)
￫
In this case, the number of bytes is variable (13, 14, or 16) and
will depend on the selected format.