Beckhoff EPP3504-0023 Short Manual page 150

Commissioning on EtherCAT Master
integer or similar PDO, it is also possible to allocate this to a set of bit-standardized variables. Here, too, a
"Goto Link Variable" can be executed in the other direction, so that the respective PLC instance can then be
selected.
Note on type of variable assignment
The following type of variable assignment can only be used from TwinCAT version V3.1.4024.4
onwards and is only available for terminals with a microcontroller.
In TwinCAT, a structure can be created from the mapped process data of a terminal. An instance of this
structure can then be created in the PLC, so it is possible to access the process data directly from the PLC
without having to declare own variables.
The procedure for the EL3001 1-channel analog input terminal -10...+10 V is shown as an example.
1. First, the required process data must be selected in the "Process data" tab in TwinCAT.
2. After that, the PLC data type must be generated in the "PLC" tab via the check box.
3. The data type in the "Data Type" field can then be copied using the "Copy" button.
Fig. 88: Creating a PLC data type
4. An instance of the data structure of the copied data type must then be created in the PLC.
Fig. 89: Instance_of_struct
5. Then the project folder must be created. This can be done either via the key combination "CTRL +
Shift + B" or via the "Build" tab in TwinCAT.
6. The structure in the "PLC" tab of the terminal must then be linked to the created instance.
150 Version: 1.2 EPP3504-0023