FBD/LD Parser Error (FBDP0009): Invalid variable name '...'.
Two reasons are possible for this error:
- Either an invalid identifier is used for a variable or an element of a structure or enumeration.
According to the IEC 61131 standard, naming conventions must be observed to ensure that each identifier can be resolved. Double-click the variable and correct it.
Further Info
For information on the naming conventions for identifiers please refer to the respective topics in the chapter "IEC 61131 Programming
‣ Variable/Port Properties
×‣ Extended Identifiers as IEC 61131-3 Variable Names
×". - Or, in case of an ARRAY/STRUCT/ENUM element, possibly the syntax for accessing this element within the user-defined data type is syntactically wrong (incomplete, etc.).
The respective object appears with a red background in the graphical worksheet.