SDO access procedure
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05/04 AWB1230-1543GB
First of all, the segmented transfer is initated. The index and
subindex for the “Command” object are transferred to the
EASY221-CO.
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Download SDO segment
The transfer is now concluded. A maximum of 7 data bytes
will be available. These are filled by the command code and
the operands from table 1,
.
Check that the data are available
The check is performed by reading the status (index 2020
hex
,
subindex 00
hex
). This check reading can be made using
expedited transfer, since the volume of data is only 1 byte.
The requested data become available when the status goes
to the value “00”.
Read out data
Initiate SDO upload
First of all, request the response to the previously performed
read command. To do this, segmented transfer is initiated,
and the index and subindex for the “Response” object are
sent to the EASY221-CO.
Index:
2021
hex
Subindex:
00
hex
Data bytes 1 to 4:
00
1st data byte:
Command code (61 to 64
hex
)
2nd data byte:
DMI address, H byte (always 0)
3rd data byte:
DMI address, L byte
Data bytes 4 to 7:
0
Summary of Contents for DeviceNet NZM-XDMI612
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