how they work: Events, Alarms and Limits

[inpelsa]

I can’t find any documentation about this for scada administrator so… questions! Channel columns meaning and use:

– WRITE EVENTS: means write to the events data file? if not… they are shown today but not saved? Not sure what it is for.

– EVENT SOUND: will it play some sound on server? on clients table view? on a scheme?

– EVENT ON CHANGE: on change depending on limits? (which limits are aplicable?) any change respecting last data?

– EVENT ON UNDEFINED: when is it undefined? no comm data received? after some time? (I think I remember a relationed parameter but don’t remember where is it)

– LOWER/UPPER LIMIT: what’s the utility of those limits?
– LOWER/UPPER ALARM: Event generates if below/above this limits?

Object and device fields… are needed for something?

Thanks and happy weekend!

[inpelsa]

Are any events shown when in Report/List Chart view?

[Mikhail]

WRITE EVENTS: if false, no event for the channel will be written and shown.
EVENT SOUND: plays beep in browser. Just try.
EVENT ON CHANGE: on any change. Usually the option is used for discrete values.
EVENT ON UNDEFINED: e.g. connection is lost. Event fires when the channel status is 0.
LIMIT: I recommend trying it using SCADA-Server generator.
Object field is optional. Device field is required if channel value is measured by a device.

Are any events shown when in Report/List Chart view?

Sorry, I didn’t catch the meaning.

Have a nice weekend too 🙂

[inpelsa]

WRITE EVENTS… is like “Events enabled” ? I think ‘events enabled’ is more understandable.

AVERAGING: how does averaging work? continuos average? last 100 values average? last minute average?

By the way… as only minute-data is shown… what happens when communicator sends several values on the same minute? does an average? maximum? latest?

Limits… I will try to guess it but that’s not an answer.

> Are any events shown when in Report/List Chart view?
> Sorry, I didn’t catch the meaning.
When in a report view with some list chart graphs there are no Events shown. Useless? => hide it, makes you think there are no events.

[Mikhail]

I agree, “events enabled” is better.

Averaging:
Received values are summarized within a period (minute or hour) then divided by their count and the result is stored to archive.

Events:
In the new web app the chart list will use the common page template, so events will be visible. Thanks, recently I thought whether it is required or not.

[inpelsa]

Just one doubt more…

As nothing is 100% reliable and this test-wireless link even less… I get some events displayed as: Normal after a loss of link (maybe 3 times a day, but with 100 channels…)

Is there any option to avoid/ignore NORMAL events caused by a communication error?

Thanks!

[Mikhail]

Hi,
Uncheck Event on undefined checkbox for these channels.

[inpelsa]

Hehehehe… I already understood that column…

Event appears and checkbox is NOT checked!

[Mikhail]

Do limits are set for those channels?

[inpelsa]

http://s32.postimg.org/9fkw5rf5h/.jpg

Yes, there are limits. Any way to avoid those Normal ?

• This reply was modified 7 years, 10 months ago by inpelsa.
• This reply was modified 7 years, 10 months ago by inpelsa.
• This reply was modified 7 years, 10 months ago by inpelsa.

[Mikhail]

Something wrong with the image.
It requires changes in SCADA-Server logic. The changes may be done within a common queue of tasks or may be done fast for a fee.

As a workaround, limits can be implemented using formulas, but in this case you need separate channels for alarm signalling.

[inpelsa]

I tried several times to link image, after 5 minutes i leaved it out, anyway you got it.

Leave the task for the queue,it’s time to make link reliable!!

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