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Adds hysteresis to a control signal.
Hysteresis is a characteristic of systems in which the output cannot be predicted from the input values alone. The output is affected by the input, and by the internal state of the system. The internal state of the system may be known directly, or it may be inferred from a history of the input values.
For example: Digital thermostats are designed (or configured) so that the space temperature at which heating stops is greater than the temperature at which heating starts. When heating the space, the output is on until the input reaches the higher temperature. As the space is cooling, the output is off until the input reaches the lower temperature. To predict the output when the input is between the higher and lower temperatures, you must know if the input is rising or falling; or, if the output was previously on or off. The space temperature alone is not enough to predict the output.
Inputs |
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Slots |
Type |
Default |
Description |
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In |
Numeric |
Null |
The input to monitor, the default value is Null. |
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SwitchOn |
Numeric |
Null |
The value to compare for turning on the output, the default value is Null. If the input value is greater than the SwitchOn value, the output will be True. |
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SwitchOff |
Numeric |
Null |
The value to compare for turning off the output, the default value is Null. If the input value is less than the SwitchOff value, the output will be False. |
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Outputs |
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Slots |
Type |
Description |
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Out |
Digital |
The digital output to control. The default value is False if the SwitchOn condition has not been met and/or one or more input slots are null. |