CAN Interface (HG 73350)
English, Revision 03, Date: 20.11.2015
21
Operation Mode
Explanation
Cyclic
every n‘th Sync telegram data is transmitted
Acyclic
transmits if an event has occurred since the last Sync tele-
gram
Synchronous
data is transmitted after a Sync telegram is received
Asynchronous
data is transmitted event-driven
RTR
solely upon request via a Remote Frame
Inhibit Time
minimum time span that has to pass before the same PDO
is sent again
Event Time
Whenever this time span ends an event is initiated. Is re-
started after each event.
Table 8
PDO operation modes
Abbreviation
Name
Meaning
PDO
Process Data Objects
maximum 8 Byte process data
TxPDO
Transmit-PDO
the process data sent by a device
RxPDO
Receive-PDO
the process data received by a device
SDO
Service Data Objects
serves for reading and writing device parameters, no size
limit
Sync
Synchronization Tele-
gram
bus-wide telegram sent by the CANopen® Master
—
CAN Identifier
the address on which a PDO,SDO is sent
—
Node ID
CANopen®: the address of the device that is added to the
CAN identifier
Table 9
Definition of terms CAN/CANopen®
Name
Meaning
Low Byte First
Little-Endian-Format, Intel Format
the low byte of each multibyte value is sent first
High Byte First
Big-Endian-Format, Motorola Format
the high byte of each multibyte value is sent first
Left-aligned
Order of the bits in a byte from left (high, most significant) to right (low)
Table 10
Bit and Byte order