Factorytalk Periodic Task Syntax

jknott · Dec 9, 2014

Hello,

I am working on a project that requires several tasks with seperate programs in each task containing program specific tags. The issue that I have come across is that when I try to set up the connection in Factorytalk to the periodic task tag I am unable to see the tag in the online tag browser. When I set up the offline tag browser I am able to see the Task specific tags (eg. {::[plc]Program

allet.Test} - Pallet is in a periodic task) but when I test it the program is unable to see the tag and I recieve 'error' on the button. My question is can Factorytalk use periodic task program specific tags and if so what is the proper syntax to make it work. Any help is greatly appreciated.

ASF · Dec 9, 2014

Hi and welcome to the forum!

Unfortunately no - and it's not just specific to periodic tasks. For FactoryTalk to be able to see/read/write a PLC tag, the tag must be in the controller scope, not a program scope.

jknott · Dec 9, 2014

I have program scope tags working already for the continous task with the same syntax {::[plc]Program

allet.Test}

jkerekes · Dec 9, 2014

ASF said:
Hi and welcome to the forum!

Unfortunately no - and it's not just specific to periodic tasks. For FactoryTalk to be able to see/read/write a PLC tag, the tag must be in the controller scope, not a program scope.

That's not true. You can see the program scoped tags too in FTView. What is the external access attribute set for that tag? What version of FTView? SE or ME?

jknott · Dec 9, 2014

6.1 ME and the tag attribute is set to read/write

ASF · Dec 9, 2014

jkerekes said:
That's not true. You can see the program scoped tags too in FTView. What is the external access attribute set for that tag? What version of FTView? SE or ME?

Really? Has this always been the case? I was sure I read somewhere once that you couldn't do that...

rdrast · Dec 10, 2014

ASF said:
Really? Has this always been the case? I was sure I read somewhere once that you couldn't do that...

Yes, you could always use Program scoped tags in an FTView application, but since it is FTView, and more buggy then a fire and mound, don't count on the tag browser EVER working. It hasn't since FTView was released, and has never been fixed to the point of being more then slightly usable.

Type in your tag addresses manually, and all is good. That is another reason that I never EVER use direct tag addressing on displays, I always create HMI tags. Do the skeleton structure first, then actually create my tags in Excel.

jknott · Dec 10, 2014

The tag doesn't work when I manually enter it

rdrast · Dec 10, 2014

Post screenshots.
Post the error message. (there is one).

jkerekes · Dec 10, 2014

What exactly did you type in? I've had good luck with the Tag Browser in recent versions. Did you do a refresh by right clicking on the folder? Did a reboot of the computer? The syntax to a program scoped tag is something like this:
{::[PLC1]Program:Unit1.Instrument_Fail}

jknott · Dec 10, 2014

I have program scope tags working with no issues in the continous task. The problem is program scope in a periodic task. Just would like to know if it is possible to address these tags at all through factorytalk. If someone has done this successfully before please let me know. Otherwise I may be wasting my time on this.

jknott · Dec 10, 2014

Reinstalled factorytalk and this issue went away. Thank you to everyone for assisting. Factorytalk can use program tags in a periodic task with no issues.

Factorytalk Periodic Task Syntax

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