Experimental Physics and
Industrial Control System

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<== Date ==>		<== Thread ==>

Subject:	Re: Question about pv value and the label display in CSS boy opi
From:	"Kasemir, Kay" <[email protected]>
To:	lzf neu <[email protected]>
Cc:	"[email protected]" <[email protected]>
Date:	Fri, 12 Aug 2016 15:09:59 +0000

Hi:

On Aug 12, 2016, at 10:16 AM, lzf neu <[email protected]> wrote:

1) My first problem is how to display a pv value that multiplied by 1E6;

Ideally, you add a calc record to the IOC to create your scaled PV.

Then you can just display the PV “as is”.

I have tried Text Update widget in CSS Boy opi and write a EmbeddedScript for the widget which is as follows:

import Package(Packages.org.csstudio.opibuilder.scriptUtil);

var pv0=PVUtil.getDouble(pvs[0]);

widget.setPropertyValue=("pv_value",pv0=pv0*1E6);

The Text Update widget displays the value of the PV.

If you have a script that also updates the value of the widget, they both fight each other.

Use a Label widget, then update its text:

var pv0=PVUtil.getDouble(pvs[0]);

widget.setPropertyValue=(“text", “The scaled value is %g” % pv0*1E6);

Ideally, though, avoid the script and just create a proper PV in the first place.

2 ) My second question:

In order to display the unit, I place a Label widget and set its Text as "Sv/h" and I hope the Text changed to "uSv/h" correspond to the pv value that multiplied by 1E6.

How is the text supposed to change? Hope is not a good strategy for this case.

You can again attach a script to the Label widget that sets the label’s “text” property based on the value of some PV.

Ideally, though, avoid the script and create a proper PV in the first place:

record(calc, “scaled_value")

{

field(INPA, “that_original_value CP”)

field(CALC, “A*1E6”)

field(EGU, "uSv/h”)

}

==> Now you just add a Text Update widget, enter the “scaled_value” as a PV name, done.

-Kay