Hi smcuser,

If you use a custom data type for IO addresses, you cannot use it for input and output. You must always use one data type for input and one for output. However, you can combine the two data types used for input and output into a third.

This is done, for example, with the internal data types PD_TELx from V17. For example, PD_TEL5 contains 'input' of type PD_TEL5_IN and 'output' of type PD_TEL5_OUT.

Kind regards
Stefan