System bus (CAN) with Servo PLC & Drive PLC
General information
2-6
l
PLC-Systembus EN 1.1
2.5
Process data transmission
Process data are used in control technology, e.g. setpoint and actual values.
•
Process data are transmitted with a high priority as so-called PDOs (
Process Data Objects)
via the system bus.
•
Special system blocks are used to transmit and receive process data:
CAN
(integrated)
XCAN
(AIF interface)
FIF CAN
(FIF interface)
Info
CAN1_IO
CAN2_IO
CAN3_IO
AIF1_IO_AutomationInterface
AIF2_IO_AutomationInterface
AIF3_IO_AutomationInterface
FIF_CAN1_IO
FIF_CAN2_IO
FIF_CAN3_IO
Cyclic process data (Sync-controlled)
event or time-controlled process data
event or time-controlled process data
Tip!
In the following sub-sections, you can find additional information about the CAN1_IO ... CAN3_IO
process data objects of the integrated system bus interface. This information applies to both the
process data objects of the AIF and FIF interface!
2.5.1
Process data channels
Process data channel 1: CAN1_IO
The
CAN1_IO
SB can be used to exchange cyclic process data (e.g. setpoint and actual values)with
a higher-level control system.
Cyclic process data (Sync-controlled)
Process data channel 1
CAN1_IN
CAN1_OUT
Control system
Fig. 2-2
Process data channel 1 (CAN1_IO) for cyclic data exchange
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