Three groups of variables are available for programming: The user variables (global or local), the constants (Boolean, numeric) and the system variables (measurement values).
- User variables
User variables are variables which are personally set up and can be maintained locally or globally. A local variable is only retrievable again in the program in which it was defined and can therefore only be used locally. If a variable has been declared a global variable, it can also be retrieved in another program code and can also be read out or written using the Modbus register. The auto save function saves the value if a power failure occurs (persistence). User variables can be set up as Boolean variables (digital 1/0) or as numeric variables.
- Constants
Constants are fixed values with which it is possible to work in program code. Double-clicking (left mouse key) the variable box opens the configuration level, in which the fixed value can be assigned. Here too, variables can be set up as Boolean variables or as numeric values. The exception is the string variable: A text can be saved with this.
- System variables
System variables are measurement values provided by the device. All measurement data and calculated values, such as consumption, can be retrieved with these variables and can be processed in the program code.
