Process data transfer
Available process data objects
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EDSMF2178IB EN 3.0
Process data telegram to the controller (RPDO)
The identifier of the process data telegram includes the node address of the controller. The
telegram has a maximum user data length of 8 bytes. This chapter describes which user
data will be evaluated for the controllers.
The CAN bus is connected to the automation interface X1 via the communication module.
X1 is connected to the function block AIF−IN. Here, the user data is transformed into
corresponding signal types in order to use them for further function blocks. The control
word is especially important for the controller. It contains the drive setpoint in user data
bytes 1 and 2.
Byte 3, 4
X1
Control word
AIF−IN
Byte 1, 2 =
Identifier
User data
8 bytes
AIF
X1
X1 = AIF interface, e.g. 8200 vector
Fig. 9−1 Example: Process data telegram to controller
Process data telegram from the controller (TPDO)
For the cyclic process data telegrams from the controller, the function block to be used is
called AIF−OUT. The status word (bytes 1 and 2) included in the process data telegram is
transmitted on the CAN bus to the master via this function block.
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