CS1G reported bus error

Time: 7/16/2017 9:46:58 PM

CS1G-CPU4in CS1G-CPU45 frame CS1G-CPU45 with 6 CS1W-B7A22, 2 OD261,
Now, the CS1G bus error, error code is "80CF/0F0F", fifth B7A22 module of the ERROR1 indicator light, this module corresponding to the address is 16 ~ 19, of which 16. and 17. are 18. and 19. is output, input, practice, only 16. and 19.
What's wrong with ERROR1, please? (altogether