Controllogix function block diagram - PLCS.net

pauly · August 17th, 2007, 10:10 AM

I am using the PIDE function in controllogix and the automatically created tags for the PIDE don't seem to be avaliable to the rest of the other routines. Is this a Function Block Diagram thing or am I missing something?

dougrb · August 17th, 2007, 11:25 AM

Well, this is going off a year old memory, and I wasn't directly involved in the project at the time. It seems that if a FB was created with controller scoped tags, the FB would not work. Therefore, you had to use program scoped tags. Since they're program scoped, you can't access them from other programs.

This was confirmed with tech support at the time. A major PITA!

mcaulem · August 17th, 2007, 11:29 AM

I think you created the tag as program scope instead of Controller. In controlLogix, you can have both. Program tags are only available within the actual program and Controller scope tags are available anywhere.

It might sound weird but it is very usefull when you have multiple machines that are identical. You can have all the logic tags to that machine as program tags. Then map in/out. So after you make one machine. Just need to copy and change the map in/out.

August 17th, 2007, 10:10 AM	#1
pauly Member Join Date: May 2002 Location: South Wales,U.k Posts: 199	Controllogix function block diagram I am using the PIDE function in controllogix and the automatically created tags for the PIDE don't seem to be avaliable to the rest of the other routines. Is this a Function Block Diagram thing or am I missing something? __________________ Pauly

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August 17th, 2007, 11:25 AM	#2
dougrb Member Join Date: Oct 2005 Location: Kansas Posts: 39	Well, this is going off a year old memory, and I wasn't directly involved in the project at the time. It seems that if a FB was created with controller scoped tags, the FB would not work. Therefore, you had to use program scoped tags. Since they're program scoped, you can't access them from other programs. This was confirmed with tech support at the time. A major PITA!

August 17th, 2007, 11:29 AM	#3
mcaulem Member Join Date: Oct 2004 Location: Slave Lake, AB Posts: 10	I think you created the tag as program scope instead of Controller. In controlLogix, you can have both. Program tags are only available within the actual program and Controller scope tags are available anywhere. It might sound weird but it is very usefull when you have multiple machines that are identical. You can have all the logic tags to that machine as program tags. Then map in/out. So after you make one machine. Just need to copy and change the map in/out.

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