Monitoring function block diagram programs

When monitoring function block diagram (FBD) programs, you are monitoring the value for the input reference, variable, function, and function block at the output of an FBD.
The values appear in color, number, or text values according to their data type:
  • Boolean data type output values are displayed in either black or gray, regardless of whether the value is True or False. A black output value indicates that it can be modified, and a gray output value indicates that it cannot be changed.
  • Output values of the SINT, USINT, BYTE, INT, UINT, WORD, DINT, UDINT, DWORD, LINT, ULINT, LWORD, REAL, LREAL, TIME, DATE, and STRING data types are displayed as a number or text value in the element.
  • When the output value for a number or text value is unavailable, question marks (??) appear in the output label. Values also appear in the corresponding
    Dictionary
     instance.
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