Analog sensors

Vutlan analog sensors have analog inputs and analog or discrete outputs.

If the analog sensor is not connected or undefined, such sensor will be in a state of 'not connected'.

The analog sensor parameters of the VUTLAN devices can be located depending on their physical location in the sub-branches:

• ctlInternalSensors - main system sensors;

  • ctlInternalSensorsAnalogsTable;

• ctlCANSensors - CAN bus sensors;

  • ctlCANSensorsAnalogsTable;

• ctlRsSensors - serial port sensors;

  • ctlRsSensorsAnalogsTable;

Example. Viewing analog sensors:

The location of such sensors in the system is determined by the module identifier in which this element is physically located and with the port number in the module - Num.

Sensor with analog output can be in one of the following states defined with thresholds ctlAnalogLowAlarm, ctlAnalogLowWarning, ctlAnalogHighWarning, ctlAnalogHighAlarm:

• 'normal' - the measured value is above the threshold ctlAnalogLow, but below the threshold ctlAnalogWarning, ctlAnalogAlarm;

• 'low alarm' - below normal, the measured value is below the threshold ctlAnalogLowAlarm;

• 'low warning' - below normal, the measured value is above the threshold ctlAnalogLowAlarm, but below the threshold ctlAnalogLowWarning;

• 'high warning' - above normal, the measured value is above the threshold ctlAnalogHighWarning, but below the threshold ctlAnalogHighAlarm;

• 'high alarm' - measured value is above the threshold ctlAnalogHighAlarm;

Fields ctlAnalogAT0 (default "1.0") and ctlAnalogAT75 (default "0.0") are only for the voltage sensors and set the coefficients to convert the measured value using the following formula:

Field ctlAnalogExpression (default "x") has meaning only for the current sensor (4-20mA), and sets the expression to convert the measured value:

thus the default readings correspond to the measured values with no additional changes.

It supports the following operations: "+", "-", "/", "*", "%"(modulo), "^"(involution)

Support the following functions:

• "abs" - absolute value;

• "sqrt" - square root;

• "exp" - exponential;

• "ln" - the natural logarithm;

• "log" - logarithm;

• "sin" - sine;

• "cos" - cosine;

• "tan" - tangent;

• "asin" - arc sine;

• "acos" - arc cosine;

• "atan" - arc tangent;

Example. Setting thresholds for a sensor with analog output with ElementID=22: