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3
CANopen access procedure
26
Festo – GDCP-CMMP-M3/-M0-C-CO-EN – 1510b – English
601
h
Len
D0
D1
D2
D3
D4
D5
D6
D7
Identifier
Start actual position
(D0 … D3)
Number of data bytes (here 8)
Start actual speed
(D4 … D7)
In this way, almost any desired data telegrams can be defined. The following chapters describe the
settings necessary for this.
3.3.1
Description of the Objects
Object
Comment
COB_ID_used_by_PDO
In the object COB_ID_used_by_PDO, the identifier in which the
respective PDO is sent or received is entered. If bit 31 is set, the
respective PDO is deactivated. This is the presetting for all PDOs.
The COB-ID may only be revised if the PDO is deactivated, that is,
bit31 is set. A different identifier than is currently set in the controller
may therefore only be written if bit 31 is simultaneously set.
The set bit 30 shows when the identifier is read that the object cannot
be requested by a remote frame. This bit is ignored during writing and
is always set during reading.
number_of_mapped_objects
This object specifies how many objects should be mapped into the
corresponding PDO. The following limitations must be observed:
A maximum of 4 objects can be mapped per PDO
A PDO may have a maximum of 64 bits (8 byte).
first_mapped_object …
fourth_mapped_object
For each object contained in the PDO, the motor controller must be
told the corresponding index, sub-index and length. The stated length
must agree with the stated length in the object dictionary. Parts of an
object cannot be mapped.
The mapping information has the following format
transmission_type and
inhibit_time
Which event results in sending (transmit PDO) or evaluation (receive
PDO) of a message can be determined for each PDO.