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invalid readings, an input alarm is set and any outputs using the virtual input for control are disabled.
The analog values that can be used for each type of calculation are selected from a List of all defined sensor inputs
and analog inputs.
There are three modes:
• Primary/Backup – The primary sensor (selected as the Input) value, as opposed to the backup sensor
(selected as Input 2) value, is chosen as the virtual input value, assuming it has a valid reading.
• Minimum Value – The sensor that has the lower reading of the two sensors is chosen as the virtual
input value. This makes sense if a failing sensor normally drifts high.
• Maximum Value – The sensor that has the higher reading of the two sensors is chosen as the virtual
input value. This makes sense if a failing sensor normally drifts low.
Virtual Input Details
The details for a virtual input include the current difference calculated, the current values of the inputs used in the
calculation, alarms, the status, and the input type.
Settings
Touch the Edit icon to view or change the settings related to the virtual input.
Deviation Alarm
Enter the value for the difference between the two input readings above which the
deviation alarm will trigger.
Deadband
This is the Alarm Deadband. For example, if the Deviation Alarm is 1.00, and the
deadband is 0.1, the alarm will activate if the sensor readings are 1.01 units apart, and
deactivate at 0.89 units apart.
Alarm & Datalog
Suppression
If any of the relays or digital inputs are selected, any alarms related to this input
will be suppressed if the selected relay or digital input is active. At the same time,
all datalogs and graphs containing the input will show no data for the duration of
the activation.
Mode
Select which mode for determining the value for the virtual sensor input.
Input
Select the physical input for the primary sensor.
Input 2
Select the physical input for the backup sensor.
Name
The name used to identify the input may be changed.
Type
Select the type of input; either Calculation, Redundant, Raw Value, Disturbance,
or Not Used.
5.2.22
Virtual Input – Raw Value
A Raw Value type Virtual Input is not a physical input. The value of the virtual input comes from the
unmanipulated signal from a real sensor.
• non-temperature compensated µS/cm
• mV for pH, ORP, Disinfection, Generic
• mA for analog inputs
• ohms for temperature
Virtual Input Details
The details for a virtual input include the current raw value of the real input used, alarms, the status, and the
input type.
Settings
Touch the Edit icon to view or change the settings related to the virtual input.
