IEA523W NO DEVICES DEFINED

Explanation
The system cannot recognize any of the devices
defined in the I/O definition file (IODF). This error occurred for
one of the following reasons: The IODF does not contain any devices defined to the system.
The unit information modules (UIM) supporting these devices are
not present.

System action
System initialization ends.  The system enters
nonrestartable wait state X'0B2'.

System programmer response
See the system programmer response
for wait state X'0B2'.

Source
Input/output supervisor (IOS)