Technical data

Controlling and Monitoring Variables
17.1 Configuring Variables for Operator Control and Monitoring
Programming with STEP 7
396 Manual, 05/2010, A5E02789666-01
Naming Conventions
For the configuration data for WinCC to be saved and transferred, they are stored under a unique
name automatically assigned by STEP 7. The names of the variables for operator control and
monitoring, the CFC charts, and the S7 programs form part of this name and for this reason are
subject to certain conventions:
• The names of the S7 programs in an S7 project must be unique (different stations may not
contain S7 programs with the same name).
• The names of the variables, S7 programs, and CFC charts may not contain underscores,
blanks, or the following special characters: [ ‘ ] [ . ] [ % ] [ - ] [ / ] [ * ] [ + ].