Danfoss MCO 305 Design Manual page 141

MCO 305 Design Guide
PDO Curve
If the application running on the controller is
sending PDO messages, then a PDO curve can be
used to extract data from the PDO message. The
data can be extracted from any byte position within
the PDO.
Note that PDO curves are not polled and cannot be
added to groups. Data is recorded asynchronously
by the Oscilloscope whenever a PDO message is
received. PDO curves will be added to the "Curve
Selection List" under the "Other Curves" heading.
Controller
This is the controller that will be associated with the curve. The user will be able to select a different
controller for the PDO. Each PDO curve can be associated with a different controller.
PDO Type
This is the type of the PDO.
Note that not all connection interface types support all PDO types and some interface types do not support
any PDO messages at all.
Byte Selection
This section is used to select which bytes in the PDO message will contain the data of interest. Bytes are
numbered starting at 1, which is the first data byte in the PDO message. The number of bytes required can
be from 1 to 4. The "B1 B2..." string with the "12 34..." string underneath it, will give the user an indication
of which bytes have currently been selected.
The four small buttons can be used to generate test PDO data that the user can then use to help verify the
correct byte and bit specification.
12 - The byte string 0x12 0x34 0x56 0x78 will be used.
FF - The byte string 0xFF 0xFF 0xFF 0xFF will be used.
?? - A string of random bytes will be generated.
P - The Oscilloscope will listen for an actual incoming PDO. If found, the bytes will be extracted from
the PDO.
Bit Selection
This section is used to specify how the value is to be extracted from the selected bytes. Byte order can be
either Low to high (which is the standard CANopen byte order and is used for commands such as PDO and
LINKSDO) or High to low (which should be used for low-level commands such as CANIN and CANOUT).
The Example bytes are exactly the test PDO bytes from the Byte Selection section above. The example
bytes in this section are always displayed in the standard high-to-low byte order for a single multi-byte
value.
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