SEW DFD11B, Руководство пользователя

Страница: 49 / 76

Manual – DFD11B DeviceNet Fieldbus Interface
49
5
Programming samples in RSLogix 500 for SLC 500
Project Planning and Startup
5.6.2 Exchanging explicit messages (parameter data) with MOVIDRIVE
®
B
Task In this program, parameter data are exchanged between the control and the inverter.
Exchange of parameter data between inverter and SLC500 takes place via
M-Files
(
→
Installation instructions on DeviceNet scanner module).
A memory area from word 224 to 255 in these M-Files is reserved for the explicit mes-
sages. The structure of this memory area is shown in the following figure.
This memory area is split up into two areas:
• Transmission header (three words)
• Explicit message body
The memory areas in the M-Files are described in more detail in the following overview.
54172AEN
Memory area Function Length Value Description
Transmission header cmd/status
1/2 word
each
→
follow-
ing table
cmd: Entry of command code
status: Entry of transmission status
TXID 1 ... 255 During creation or downloading of a
request to the scanner, the contact
plan program of the SLC5 processor
assigns a TXID to the transfer.
Size 3 ... 29 Size of the explicit message body (in
bytes!)
Connec-
tion 0 DeviceNet connection (= 0)
Service 0E
hex
10
hex
05
hex
etc.
Get_Attribute_Single (Read)
Set_Attribute_Single (Write)
Reset
see DeviceNet specification for more
services
Explicit message body Class
1 word each 0 ... 255
DeviceNet class
Instance DeviceNet instance
Attributes DeviceNet attribute
Data 0 ... 26 words 0 ... 65535 Data content
Class
Instance
Attribute
T
ransmission
header
Explicit Message Body
Word 224
TXID cmd/status
Connection Size
Service MAC-ID
Data
Word 225
Word 226
Word 227
Word 228
Word 229
Word 230
...
Word 255
0 0
I