I can only guess. No experience with Fuji HMI software.
If bit M700 is on, it triggers an error message. Look under the [ Sub-action ] or [ Detail ] tabs to see what the message is.
Not sure what the 50 relays are. Maybe they do 50 alarm bits from M700 to M749.
In your 206 Prestest project, you have an alarm bar. That's good. To add error messages, go to [ Objects ] [ Alarm ] [ Alarm (Event) Log ]. Click [ New ].
Change [ Address Type ] to [ Bit ], [ PLC Name ] to [ Mitsubishi FX2N ].
[ Address ] to [ M ] [700 ].
Now, click [ Message ] tab, and enter text in [ Content ] box.
With Weintek, I do this for each alarm. There are many other methods, but this is easiest for just a few alarms.