Compact controller ER 2022S and ER 2022SA
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 formula - The string of signs in the formula consists of ASCII characters and can have a
maximum length of 60 characters.
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The formula can only be entered in the setup program.
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Formulae can be freely entered according to normal mathematical rules.
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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 or radio controller
Radio control
The controller is preset either as a difference/humidity or ratio controller
(extra code) or must be configured via the setup program. Analog input
2 must be available.
v
Setup/Only setup/Math/Logic/Math 1
The process variables for the two analog inputs have a fixed definition.
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 function “Math 1” and displayed.
The required ratio E1/E2 is programmed as the setpoint (ratio setpoint) in the
Ratio: E1/E2
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