This screen shows both the 4-20mA value and the Engineering equivalent value - if the value is AOR - 'Analogue Out of Range' then the alarm would be triggered and the actual value would be shown as 0 - 22 mA.
This screen also shows that alarms for each analogue signal - they are all shown in grey as the system was offline at the time of capture of the graphic. But the idea is that the text is :-
Bolder when Enabled,
Yellow when the Alarm is Acknowledged and
Red Flashing when the Alarm is UnAcknowledged.
The AOR alarm is not able to be switched off - but is shown in the same form as the other alarms so that the graphic can make sure that the S7 code is indeed monitoring the alarm condition when operating normally.
There is also a seventh alarm condition that has not been configured. This is available for future expansion where the type might be encoded into a lookup table. Alarms such as LoDEV ( Low Deviation ) , HiDEV ( High Deviation ) and the ROC ( Rate Of Change ) alarms are typical of other alarms that might want to be configured for a given analogue signal.