System variables

To access special data registers and special internal flags, use the PLC-independent system variables. You can insert the system variables into the body via the Variables pane.

• For each special data register and flag, a system variable exists according to the following syntax as specified in the table of prefixes:

  

• Additionally, system constants written in upper-case letters are available, e.g.: SYS_MEMORY_AREA_DT

The system variables can be monitored under Monitor > Special flags and registers, the system variables names are displayed as the last entries in the comments.