This error is returned by several API functions to show that the actual communication channel is NOT configured.
Without a fieldbus configuration it is not possible to use functions which rely on the configuration like BUS ON / OFF, reading/writing I/O data or changing
any other bus specific state.
Following Reasons may apply:
- Protocol stack was not configured before
- There is no configuration database file (config.nxd) available for the Protocol stack or downlaoded to the hardware
- If packet configuration is used, the application has not processed the packet configuration yet.