User Manual

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10 Extra codes
10.1 Math and logic module
The setup program can be used to implement two mathematical calculations or logical
combinations of various signals and process variables from the controller in a formula.
With math formulae, the calculated result is presented through the two signals “Math
1” and “Math 2” in the analog section. With logic formulae, the result of the logical
combination is presented through the signals “Math 1” and “Math 2” of the
configuration for binary functions.
Chapter 8.6 “Binary functions “binF””
Entering formulae - The string of signs in the formula consists of ASCII characters, and can have a
maximum length of 60 characters.
- The formula can only be entered in the setup program.
- Formulae can be freely entered according to normal mathematical rules.
- Spaces can be inserted at will into the formula character string. But spaces are not
permitted within function labels, variable names and constants.
10.2 Difference, humidity and ratio controllers
If the extra code is activated, these three types of controller can be selected through
the setup program.
v Setup/Only setup/Math/Logic
The process variables for the two analog inputs have a fixed definition.
Ratio
control
The control is always based on analog input 1 (E1).
The math module forms the ratio of the measurements from E1 and E2, and produces
the setpoint for the controller. The ratio of the measurements can be called up through
the functions “Math 1” or Math 2” and displayed.
The required ratio E1/E2 is programmed as the setpoint (ratio setpoint) in the setpoint
definition.
Ratio: E1/E2