ENGLISH
OUTPUT MODULE
CR2011
PAGE
45
Object
(also OBJ)
term for data/messages which can be exchanged in the CANopen network
Object directory
contains all CANopen communication parameters of a device as well as
device-specific parameters and data
Access to the individual entries is possible via the index and S index.
Operational
Operating state of a CANopen participant
In this mode SDOs, NMT commands and PDOs can be transferred.
PDO
Process Data Object;
in the CANopen network for transfer of process data in real time; such as
the speed of a motor
PDOs have a higher priority than SDOs; in contrast to the SDOs they are
transferred without confirmation. PDOs consist of a CAN message with
identifier and up to 8 bytes of user data.
PDO Mapping
describes the application data transferred with a PDO.
Pre-Op
Preoperational; operating state of a CANopen participant. After application
of the supply voltage each participant automatically goes into this state.
In the CANopen network only SDOs and NMT commands can be transfer-
red in this mode but no process data.
Prepared
(also stopped) operating state of a CANopen participant
In this mode only NMT commands are transferred.
Rec PDO
Receive Process Data Object
(also Rx PDO)
ro
read only (unidirectional)
rw
read-write (bidirectional)
RX-Queue
reception buffer
s16
data type signed 16 bit
SDO
Service Data Object;
With this object direct access to the object directory of a network partici-
pant is possible (read/write). An SDO can consist of several CAN messages.
The transfer of the individual messages is confirmed by the addressed parti-
cipant.
With the SDOs devices can be configured and parameters can be set.
Server SDO
process and parameter set to make the object directory of a network parti-
cipant available to other participants (clients).
S-Idx
(also Sldx)
Subindex within the object directory of a CANopen device
Start Guarding
start node guarding
str
data type string (variable for strings such as text "load")
Sync Error
missing Sync OBJ in the adjustable communication cycle
Sync object
synchronisation object for simultaneous update in the complete network or
for accepting process data of the respective parameterised PDOs.
Sync Windows
time during which the synchronous PDOs have to be transferred
Time Stamp
time stamp to align existing clocks in network participants
Trans Type
type of process data transmission; synchronous, asynchronous
Trans PDO
transmit process data object
(also Tx PDO)
Trans SDO
transmit service data object
(also Tx SDO)
Tx Queue
(transmit) transmission buffer
u8
(16, 32)
data type unsigned 8 (16, 32) bits
wo
write only