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Trending machine status from a trafic light tower

Jan Lonij

I have several machines with a 'trafic light' indicating 3 statuses.

RED = STOP

ORANGE = IDLE

GREEN = RUNNING

I want a trend of these 3 situations over the last 24 hours (or 8 hours)

I can do this by using these variables for pens like:

The problem I have is that trending is only possible in 'Instant trend'

When using instant trend the charting begins when opening the page, NO history!
(See second pane in picture below.)

 

To overcome this I made ALARMS which can be trended and these are displayed correctly and with history.
(See pane 1, 3 and 4 in picture above)

Problem with this method is that my alarm page is displaying all these alarms


AL_201_RED, AL_302_RED etc etc.
Some have a description, some don't, this is due to my programming ;-)

Is there an other way to trend the status of the machines without using these ALARM trend with history?

If not can I filter-out, on the alarm page, these Alarms based on name or empty description field, so they are not visible anymore?

Thanks for your support.

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  • 0

    It sounds like you just need to define a trend tag with the same variable name, then uncheck the Instant Trend checkbox in Process Analyst. When you add a tag to the chart, choose Trends instead of Variable Tags and it won't use Instant Trend mode.

    If you display a Variable tag in PA, no history exists so it will just display the live value of the tag and will cache the values in memory while the pen is displayed. There will be no history from before the tag was added to the display. That's what an Instant Trend is. It's mainly for troubleshooting a problem and creating a live chart for a variable tag that isn't being trended.

    Using the alarm tag as Olivier mentioned is a good option if you don't want to add trend tags. 

  • 0 in reply to Eric Black

    The cool thing about the Instant Trend feature (which gets data from Variable Tag directly) is it can be higher resolution, e.g. display more data points and not be limited by the Trend Sample period. But it may not be suitable in all use cases. Typically you would just use a Trend Tag.

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