TagRead() in text display functions does not work.

Brandon over 5 years ago

I cannot get TagRead to return a value in an text object with numeric display.

Consider the following example:

INT FUNCTION IsGreater(sTag)

RETURN StrToInt(TagRead(sTag)) > 100

END

If this function is placed in a text object the function displays nothing. If I run this function in function Message() I receive a result.

Patrick over 5 years ago

Correct. You cannot use blocking functions on graphics pages.
Please change your function so that is accepts values instead of tag names:

INT FUNCTION IsGreater(INT iValue)
RETURN (iValue > 100)
END

Change the text object expression so that it calls the function with the value of the tag:
IsGreater(MyTag)

and not:
IsGreater("MyTag")

You could also omit the function entirely by entering the equation directly in the text object:
(MyTag > 100)
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Brandon over 5 years ago

Ok, that's what I thought. I guess my true problem is that I want to build the tag in the function because I've hit a character limit. But I think you just gave me an idea. Thanks for the reply.
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Nick over 5 years ago

Yep, I think we've all hit Citect's character limit before :) Not sure why they still have this...
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Olivier over 5 years ago

In Citect SCADA 2018 we introduced a non-blocking function, TagGetValue(). See help here: https://gcsresource.aveva.com/Citect/WebHelp/citect2018R2/Content/WhatsNew_IndirectTagValueLookups.htm
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