Download "user manual"

Working with Tags
4.4 Array basics
4.4
Array basics
Definition
Array data of a uniform data type is successively arranged and is addressed within the
address space to allow access to these data by means of an index. The array elements are
addressed by means of an integer index starting at "0". Each array element is assigned the
same properties which are configured at the array tag.
Object view
Advantages
Multiple array elements of the same properties can be addressed by a single array tag. You
can then use each array element as any other tag in your configuration. However, there are
certain restraints:
● In terms of the properties: Not all array elements are assigned limit values
● Not all HMI devices support array tags.
Application examples
Array tags can be used in the following situations:
● To group process values in profile trends: You map process values to trends which are
acquired at different points in time, for example.
● To access specific values which are grouped in trends: You output all values of the profile
trend by stepping up the index tag, for example.
● To configure discrete alarms with successive bit number.
● To save machine data records to a single tag.
132
WinCC flexible 2007 Compact / Standard / Advanced
User's Manual, 07/2007, 6AV6691-1AB01-2AB0