What I meant is why do you have [ ) and ( ] ? What is the meaning of that?
(first square bracket and then round bracket)
When alarms are shown in Alarm history control it’s good to know (when you looking back at time) what kind of errors was there in servo drive. (servo error is just an example).
Maybe I’m spoiled, but in WinCC Scada from Siemens (quite a number of projects I’ve done) you can define alarm text as:
“Motor M12 is off! Servo Error code= @tagWithValue”
tagWithValue is the name of the tag, which get value from PLC. And in alarms table the text is shown:
“Motor M12 is off! Servo Error code= F9205”
That’s one way. Another way is:
WinCC have ten (max) additional fields (which you can show in Alarm history table or not) where you can define ten process values. Process value is value which you want to show in the additional field(s) in the alarm history table.
So then in alarm history table there is a Alarm text field AND Process Value1 field (and Process Value2 field and Process Value3 field and…).
So, when you look at the alarms history, you can get a feeling, what kind of problems this motor (or conveyor or crane or whatever) had.