Operating Characteristics Canopen - Bosch IO-BOX32 Manual

6–4
6.1.3

Operating characteristics CANopen

Start-up characteristics
The characteristics of the bus connection IO-BOX32-CAN depend on the
properties of the field bus CANopen as well as on the operating parameters
that can be set by the user.
PDO channels:
CAN telegrams have a maximum data capacity of 8 bytes and therefore en-
able per CAN node 2 channels for transmission and 2 channels for reception
of PDOs (Process Data Objects).
The IO-BOX32-CAN occupies a maximum of 5 bytes inputs and/or outputs,
so that 1 transmission and 1 reception PDO are sufficient.
SDO channel:
There is one SDO channel (Service Data Object) available per CAN node in
transmit and receive direction.
'Power On':
After the 24-V logic supply has been applied, the hardware components of
the IO-Box32 are tested:
D In the event of a fault, the assembly is placed on system halt.
D After a successful start-up test, the CAN controller is initialized in accor-
dance with the settings of the rotary switches S1 to S3.
Preoperational Mode:
After successful initialization, the assembly is in the 'Preoperational' mode. It
can be set in the 'Operational' mode by the CAN master by means of an
'NMT START' telegram.
Operational Mode:
In the Operational mode, process data can be transferred via PDO.
1070 072 302-101 (01.06) GB