SDO access procedure
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05/04 AWB1230-1543GB
SDO access procedure
Write data
Write using segmented transfer
Segmented transfer can be used to write up to 4 bytes
simultaneously to the EASY221-CO. The transfer is made in
the following steps:
1. Initiate SDO download
The segmented transfer is initiated. The index and subindex
for the “Command” object are transferred to the EASY221-
CO, which takes on the server role for this communication
link.
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2.
Download SDO segment
The segmented transfer is concluded. A maximum of 7 data
bytes will be available. These are filled by the command code
and the operands from table 1, page 15 :
This concludes the write procedure.
Index:
2021
hex
Subindex:
00
hex
Data bytes 1 to 4:
00
1st data byte:
Command code (69 to 6C
hex
)
2nd data byte:
DMI address, H byte (always 0)
3rd data byte:
DMI address, L byte
Data bytes 4 to 7:
Data (= operand 1 to 4)
h
For the data addresses and interpretation
“Data”, from page 23.
Summary of Contents for DeviceNet NZM-XDMI612
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