Lenze DDS System bus CAN for PLC - Manual (Page 19)

System bus (CAN) for Lenze PLC devices
General information
2−7
l
PLC−Systembus EN 2.0
2.6 Transmission of process data
Process data are data for control−oriented concerns, e. g. setpoints and actual values.
·
Process data are transferred as so−called PDOs (Process Data Objects) with a high priority via
the system bus.
·
Transmitting and receiving the process data is effected by the use of specific system blocks:
CAN
(integrated)
XCAN
(AIF interface)
FIF−CAN
(FIF interface)
For Drive PLC only!
CANaux
For ECSxA only! Information
CAN1_IO AIF1_IO_AutomationInterface FIF_CAN1_IO CANaux1_IO Cyclic process data (sync−controlled)
CAN2_IO AIF2_IO_AutomationInterface FIF_CAN2_IO CANaux2_IO Event− or time−controlled process data
CAN3_IO AIF3_IO_AutomationInterface FIF_CAN3_IO CANaux3_IO Event− or time−controlled process data
Tip!
In the following subchapters you’ll receive further information on the CAN1_IO ... CAN3_IO process
data objects of the CAN interface. This information also applies to the process data objects of the
AIF−, FIF− and CAN−AUX interface!
2.6.1 Process data channels
Process data channel 1: CAN1_IO
The CAN1_IO SB can be used for the data exchange of cyclic process data (e. g. setpoints and
actual values) with a higher−level host system.
cyclic process data (sync−controlled)
process data channel 1
CAN1_IN
CAN1_OUT
Host
Fig. 2−2 Process data channel 1 (CAN1_IO) for the cyclic data exchange