Rockwell Automation 1791-I0VX BLOCK I/O - Manual (Page 46)

Troubleshooting
Chapter 4
4-4
4. Replace the blown fuse with a 5.0A slow blow fuse.
5. Reinstall cover and secure with 5 screws removed in step 2.
6. Reapply power to the module.
In this chapter you learned what the LED indicators represent, and how to
interpret them. Summary