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5
CANopen communication
5.3
Transmitting process data
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Lenze · I/O system 1000 · Reference Manual · DMS 5.0 EN · 09/2016 · TD17
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5.3
Transmitting process data
Process data are data for control-oriented purposes, e.g. setpoint and actual values.
Process data or the input / output data of the I/O system are transmitted as so-called PDOs (Process
Data Objects) with high priority via the fieldbus.
5.3.1
Process data telegram
The process data telegram is structured as follows:
Identifier
Information about the identifier can be found in the chapter "Structure of the CAN data telegram".
User data
The 8 bytes of user data transmit the input signals (user data sent) and the output signals (user data
received) of the modules.
11 Bit
8 bytes of user data
Identifier
1st byte
2nd byte
3rd byte
4. byte
5th byte
6. byte
7th byte
8th byte
Note!
In the Lenze setting, the identifiers are defined according to CANopen (assignment in
accordance with DS301). Via I-2101 the identifier calculation according to the system
bus (assignment according to the Lenze system bus) can be specified.
Note!
Lenze inverters expect a PDO length of eight bytes even though not all of them may have
assigned I/O values. The PDO length can be set via I-2100:
• 0: PDO length of eight bytes (Lenze setting)
• 1: PDO length according to process image