Emerson Exchange 365

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PHV preset time span

In Process History View there is a list box that allows quick selection of the time span of a chart. It contains seven entries from 15 minutes up to 1 day. Does any one know if it is possible to change or add to this list? I would like a quick way to select a few months of data.

Cedric Dawnhawk

• 25 Apr 2018 7:31 AM
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5 Replies

• Andre Dicaire

  

  • 25 Apr 2018 4:21 PM

  Cedric, The predefined time spans cannot be changed. However, PHV has a command line interface that allows you to open an chart and set the time span as part of the command. The command options are documented in BOL.
  
  You could then create a button in a DeltaV display that calls a specific chart and sets the time span as desired. It's not quite what you want as you cannot do this within PHV. The <> button will double the time span, so 1 day becomes 1 month in 5 clicks.
  
  The new Embedded Trend Object in v14 DeltaV Live exposes many of the time parameters of the trend and would allow you to create a trend GEM with custom buttons to do this, but again, not helpful for you today. Sorry.

  Andre Dicaire

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• Cedric Dawnhawk

  

  • 26 Apr 2018 2:26 PM

  In reply to Andre Dicaire:

  Thanks for your reply. I apppreciate you can open a chart from the command line specifying the time span as an argument and in fact we have a number of charts set up like this typically with spans of 1, 4 and 12 hours. However what some of the operators like to do is to view a particular period in the past once they have opened the chart. Their preferred method of doing this is to rapidly click the <> button many times, move to the date of interest and then expand again with the >< button. On some workstations rapidly clicking the <> button cause the workstation to hang, sometimes for minutes. On others there is no problem. I am investigating the reason for this (and may raise another query on the forum when I have some information) but in the meantime was wondering if there was a quick way for them to select a large time span. What I have suggested at the moment is to go into Configure Chart and enter a value in the Span box. This works, but is not as convenient as hammering the <> button.

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• TreyB

  

  • 15 Jan 2021 3:05 PM

  In reply to Andre Dicaire:

  Andre, this is something I'd love to try out. But, I'm not finding any command line interface nor a reference to anything in BOL. Could you give a little more direction please? Thanks.

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• Cedric Dawnhawk

  

  • 15 Jan 2021 5:01 PM

  In reply to TreyB:

  I just did a search for 'CLI' in BOL for v13.3 and found all the information you would need. Its under Configuration | History Collection | Customizing the Process History View

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• TreyB

  

  • 15 Jan 2021 5:06 PM

  In reply to Cedric Dawnhawk:

  thanks. Turns out since I am creating custom premade charts, I can just use the TIME SPAN tab in Configure Chart, which does exactly what I want. THanks though, I'll keep that in mind if I ever need to get deeper.

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