Table of Contents
Advertisement
8 SmartWire-DT
8.9 Programming
8.9.6.4 SmartWire-DT write request – Write job
200
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.
Byte
Designation
0
Request Reference
1
Request ID
2
DO-ID
3
No. of Paramters
4
Attribute
5
No. of Elements
6, 7
Parameter number
8, 9
Subindex
10
Format
11
No. of Values
12 - (15)
Value
￫
In this case, the number of bytes is variable (13, 14, or 16) and
will depend on the selected format.
The valid formats (byte 10) for the DS7-SWD soft starter from PROFIdrive
profile are marked in the following table:
DS7 Soft starter 09/16 MN03901001Z-EN www.eaton.com
Description
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
- FF
(i.e. 1
- 255
)
hex
hex
dec
dec
Request ID:
The type of request is specified here.
02
: Write job
hex
Drive-Object-ID:
00
hex
Number of parameters:
Only individual parameter processing is supported.
01
hex
Attribute:
Defines which object type should be accessed.
10
(16
): Value
hex
dec
Number of elements:
Address of the parameter that should be accessed
PNU 0 - PNU 999: 00
(for subindex 0 only)
hex
PNU 0 - PNU 999: 01
hex
Parameter number (PNU):
Address of the parameter that should be accessed
0000
- FFFF
(i.e. 0
- 65535
hex
hex
dec
Subindex:
Address of the parameter's first field element or start of the text
0000
- FFFF
(i.e. 0
- 65535
hex
hex
dec
Format:
01
- 7C
(→ 01
- 124
)
hex
hex
dec
dec
Number of values being accessed.
01
hex
Value: Specifies the value of the parameter being accessed.
The length depends on the format and can be a maximum of 4 bytes.
00000000
- FFFFFFFF
(i. e. 0
hex
hex
)
dec
)
dec
- 4294967295
)
dec
dec
Advertisement
Table of Contents
