Configuring structures by modular variants > Viewing and creating option and variant data > Developing complex expressions with MVL
Reserved words
Reserved word Purpose and Logical AND of logical expressions. default Specifies a default for an option. elif Use to construct conditional statements. else Use to construct conditional statements. endif Use to construct conditional statements. error Sends an error message. false Logical FALSE literal. fix Fixes an option to a given value. hide Reserved for future use. if Use to construct conditional statements. implements Use to implement options. inform Sends an informational message. integer Denotes the integer value type. legacy Reserved for future use. logical Denotes the logical value type. not Logical NOT of logical expressions. or Logical OR of logical expressions. presents Use to present options. private Specifies a private option. public Specifies a public option. real Denotes the real value type. set Sets an option to a given value. show Reserved for future use. string Denotes the string value type. then Use to construct conditional statements. to Use in various places. true Logical TRUE literal. unset Literal UNSET value. uses Reserved for future use. warn Sends an warning message.
Source: https://docs.sw.siemens.com/documentation/external/PL20251212545240207/en-US/tc_help/pse/por1737253406260/zni1737253408834/vvy1737253411999/mod_vars_reserved.html · retrieved Sat Jul 11 2026 00:00:00 GMT+0000 (Coordinated Universal Time)