ACS 800 Drive
The typical connection of X22 from the manual is the following (depends on configuration, the bridge between X22:8 and X22:11 is required):
To test +24VDC for the inputs - disconnect the ext. wires from X22:7 and X22:8. Measure the voltage between X22:7 and X22:9 / X22:8 and X22:10. You have to be sure that there is no short circuit between +24VDC and GND. There is a jumper J1 in RMIO, connecting internally X22:9 and 10 (factory setting).
Check also parameter 16.09. It depends how the RMIO board is supplied.
If you don't have the necessary experience, contact your ABB service organization.
Source: ACS800 HW and FW manuals