The 4th Slot of an 8-slot cRIO is not used.
You need to put the second Solenoid Module in slot 7.
In Java, the second Solenoid Module is referenced as "2", not by the physical slot it is in.
- Slot 1 - Analog module (required)
- Slot 2 - Digital module (required)
- Slot 3 - Solenoid module
- Slot 4 - unused
- Slot 5 - Analog module
- Slot 6 - Digital module
- Slot 7 - Solenoid module
- Slot 8 - unused