The object dictionary

All configuration data relating to an EAP device object in the TwinCAT EAP Configurator are grouped with the aid of the object dictionary. This object dictionary can be displayed in tabular form by selecting the command [Show in Tool window] from the context menu of the EAP device object (see illustration). A modification of the configuration in the graphical user interface automatically causes a modification of the object dictionary. All modifications are identified with a yellow flag. It is also possible to change the configuration manually in the object dictionary. However, this is not recommended and should only be done if the effects of the change are known precisely.

The object dictionary 1:
The object dictionary 2:

Read Only

All entries in the object dictionary that are labelled as Read Only (RO) must not be changed. Also, the objects with the indices 0xF800 and 0xF801 must not be modified manually under any circumstances. These two objects are modified, if new EAP elements such as TxFrame, Tx/RxData, Tx/RxPDOs or Tx/RxVariables are added.

Notice

Device Cycle Time

A particularly important property can be found in object 0xF800 (Configured Objects). The entry no. 8 with the name Device Cycle Time contains the task cycle time in µs, with which the EAP device is operated. The cycle time, with which a variable can be sent by this EAP device, must be an integer multiple of this cycle time.

The structure of the object dictionary and the meaning of the individual object entries are described in detail in section The CANopen object dictionary of the documentation for TwinCAT EAP device.