adccommunitymod (AutomationDirect) asked a question.
Lookout direct used with Allen Bradley Micrlogix 1500 plc
Created Date: October 11,2004
Created By: Lee Taylor
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Hello: I need to look at 13 different variables in the N7 data files using Lookout Direct. Why do I get X's across the objects when I try to put the variables into the URL. A example of the URL would be AB1.N7:16. Everything is ok until I try to program the last 2 variables. I also noticed that I get the X's if I use N7:80-N7:88 Thanks:Lee
Created Date: October 11,2004
Created by: Lee Taylor
Hello: I need to look at 13 different variables in the N7 data files using Lookout Direct. Why do I get X's across the objects when I try to put the variables into the URL.
A example of the URL would be AB1.N7:16. Everything is ok until I try to program the last 2 variables. I also noticed that I get the X's if I use N7:80-N7:88
Thanks:Lee
Created Date: October 11,2004
Created by: Tech Guy
See the AB SLC 500 data members page in the LookoutDirect program help for addressing formatting.
Created Date: October 12,2004
Created by: Lee Taylor
I looked in the help file as suggested the variables I are using the N7:80 etc are included in that table. What would be the cause of the x's appearing in the object boxes which would display variables.
Lee
Created Date: October 12,2004
Created by: Tech Guy
X's appear when the field cannot be read from the PLC. This could be due to formatting, bad comms, or for AB the memory not being expanded to cover the data range that is requested.
Perhaps this article from the NI Knowledgebase will help.
Created Date: October 14,2004
Created by: Lee Taylor
Using the Allen Bradley Micrologic 1500 any number which is not valid in a octal numbering system N7:80 thru N7:99 cannot be read by Lookout Direct. To resolve this problem in the ladder logic a move function can be written to move the data to another N location which is in the octal range. This procedure has resolved the problem.
Created Date: October 18,2004
Created by: Lee Taylor
Hello: Now that lookout is operational thanks again for your help. How do I make a number such as 1234 read 12.34 in a text message.
Lee