Parameterization and programming
ELX3351
54
Version: 1.3.1
5.5
Process data
This section describes the individual PDOs and their content. A PDO (Process Data Object) is a unit on
cyclically transmitted process values. Such a unit can be an individual variable (e.g. the weight as a 32-bit
value) or a group/structure of variables. The individual PDOs can be activated or deactivated separately in
the TwinCAT System Manager. The ‘Process data’ tab is used for this (visible only if the terminal is selected
on the left). A change in the composition of the process data in the TwinCAT System Manager becomes
effective only after restarting the EtherCAT system.
5.5.1
Selection of process data
The process data of the ELX3351 are set up in the TwinCAT System Manager. The PDOs can be activated
or deactivated separately. The ‘Process data’ tab is used for this (visible only if the terminal is selected on
the left).
Fig. 45: ELX3351 – process data selection in the TwinCAT System Manager
If the terminal is selected in the System Manager (A), the
Process data
tab (B) shows the PDO selection.
The two SyncManagers of the inputs (SM3) and outputs (SM2) can be changed (C). If one of the two is
clicked on, the PDO possible for this SyncManager appears underneath it (D). PDOs that are already
activated have an activated checkbox in front of them; this is activated by clicking on it.
