Variable Datafield event Update

Variable Datafield event Update

Hello,
Is there a way to manually update my datafield using a certain event?
I have a string variable that is manipulated in the PLC and I want to display the value only when the PLC gives the order .
My problem is that this string variable is always updated by the PLC and sometimes the display in the runtime doesnt show the complete string ,
ie: if my string is 'ABCD' it sometimes shows AB, ABCD,... depends on time that the zenon gets the variable.
Thanks

This is a migrated post! Originally posted on 11.12.2012 by user ziadrached. Please be aware that information can be outdated.