Re: CSS: Can not access PVs in python script

[Sahil <c4sahil@gmail.com>]

I had been going through the help of CSS but I can not find how to assign i.e.

pv[0] = readvoltage

if this type of assignment is invaled then alternatively how can I find which PV (e.g readvoltage)  correspondes to which pv[ ]?

Is there any table/file that contains these assignment ?

Looking forward for the solution.

Thank you.

On Mon, Aug 19, 2013 at 3:39 PM, Kasemir, Kay <kasemirk@ornl.gov> wrote:

Hi:

The parameter to PVUtil.getDouble(pv) must be one of the PVs that's an input to the script.
CSS BOY calls your script after handling the PV connections, asserting that the PVs have values, and then you can use this:

# pvs[] are the input PVs to the script.
# Assume pvs[0] is the 'voltage' PV:
voltage = PVUtil.getDouble(pvs[0])

Read the online help, look at one of the BOY Examples that are included with CSS.

Thanks,
Kay


On Aug 17, 2013, at 5:25 PM, sahil jee <c4sahil@gmail.com<mailto:c4sahil@gmail.com>> wrote:

Dear community

I am trying to acess PVs of my ioc. My ioc(stream device) is running properly and containing "readvoltage" and "readcurrent", "calculatedpower" as PVs.

In my CSS application, I want to access the above two mentioned PVs in order to make some calculations.

I am trying python embedded script as follows;

voltage = PVUtil.getDouble(readvoltage)    # readvoltage and readcurrent are PVs in my ioc
current=PVUtil.getDouble(readcurrent)
power = valtage*current

calculatedpower.setValue(power)     # calculatedpower is a PV in my ioc

When I run my opi it gives me the error;

"readvoltage" not defined?

In my opi, I have two text input widget which are receiving readvoltage PV value and readcurrent PV value, and one Text Update widget which will receive the calculatedpower PV value.

Looking for your kind reply.

Thank you all.