Yaskawa MP900 Series Ladder Programming Manual - Manual (Page 51)

4.3 User Functions
4.3.2 Creating User Functions
4-10
3.
Select Function input definition under I/O definition and enter the following information.
4.
Select Function output definition under I/O definition and enter the following information.
5. Click the OK Button. This concludes setting the function definition.
Enter.
Enter.
Click.