Have a look at the header file of the *_LDD component. You will find something like this:
/*! Device data structure pointer used when auto initialization property is enabled. This constant can be passed as a first parameter to all component's methods. */
#define BitIoLdd1_DeviceData ((LDD_TDeviceData *)PE_LDD_GetDeviceStructure(PE_LDD_COMPONENT_BitIoLdd1_ID))
For this BitIO_LDD, I can use the BitIoLdd1_DeviceData as device handle.
Erich