Cause : Digital Output Selection Error comes when these two parameters are set at the same time:

• H2-60 ≠ F [Term M1-M2 Secondary Function ≠ Not Used]
• H2-01 = 1xx [Term M1-M2 Function Selection = Inverse output of xx]

These two parameters are set at the same time:
• H2-63 ≠ F [Term M3-M4 Secondary Function ≠ Not Used]
• H2-02 = 1xx [Term M3-M4 Function Selection = Inverse output of xx]

These two parameters are set at the same time:
• H2-66 ≠ F [Term MD-ME-MF Secondary Function ≠ Not Used]
• H2-03 = 1xx [Term MD-ME-MF Function Selection = Inverse output of xx]

Clear the H2-01 to H2-03 = 1xx [Inverse output of xx] settings.