Eaton DS7 - Page 204

8 SmartWire-DT
8.9 Programming
200 DS7 Soft starter 09/16 MN03901001Z-EN www.eaton.com
8.9.6.4 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. All kinds of 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.
The valid formats (byte 10) for the DS7-SWD soft starter from PROFIdrive
profile are marked in the following table:
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. The DS7-SWD will then echo it.
01
hex
- FF
hex
(i.e. 1
dec
- 255
dec
)
1 Request ID Request ID:
The type of request is specified here.
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.
10
hex
(16
dec
): Value
5 No. of Elements Number of elements:
Address of the parameter that should be accessed
PNU 0 - PNU 999: 00
hex
(for subindex 0 only)
PNU 0 - 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
(→ 01
dec
- 124
dec
)
11 No. of Values Number of values being accessed.
01
hex
12 - (15) Value Value: Specifies 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.