alarm when 5 or more Prismaflex are up

By Tutorial Video 

1+1 , if any 1 is down , then Sensor Factory is down.

Case 1 : Notification triggered by sensors of different devices

Manual : PRTG MANUAL: SENSOR FACTORY SENSOR

DEFINE SENSOR STATUS—STATUS() FUNCTION

The status of a Sensor Factory sensor can be controlled by the Status Definition text field, if you enable the custom formula option in the Sensor Settings . Using a special syntax, you can define when the factory sensor changes to a Down status. In all other cases, the sensor will be in an Up status. The syntax is:

status(sensorID) <boolean> status(sensorID)

The parameters are:

• <sensorId> is the ID of the sensor you want to check the status of. It is displayed on the sensor details page in the page header bar.
• <boolean> is one of the Boolean operators AND , OR , or NOT . If the resulting expression is true , the factory sensor will change to a Down status.

Examples  status(2031) AND status(2044) This changes the factory sensor to a Down status if both sensors, with IDs 2031 and 2044 , are Down . Otherwise the factory sensor shows an Up status. status(2031) OR status(2044) This changes the factory sensor to a Down status if at least one of the sensors with ID 2031 or ID 2044 is Down . Otherwise the factory sensor shows an Up status. status(2031) AND NOT status(2044) This changes the factory sensor to a Down status if the sensor with ID 2031 is Down , but the sensor with ID 2044 is not in a Down status. Otherwise the factory sensor shows an Up status. Note: A status() function with NOT has to be connected with AND or OR if it is combined with other status() functions: status(sensorID) AND NOT status(sensorID) status(sensorID) OR NOT status(sensorID) ( status(2031) AND status(2044) ) OR status(2051) This changes the factory sensor to a Down status if both the sensor with ID 2031 and the sensor with ID 2044 is Down , or if the sensor with ID 2051 is Down . Otherwise the factory sensor shows an Up status.

Additionally, the following elements are allowed to perform calculations and comparisons with the values that are returned by the status functions:

• Basic operations: + (add), - (substract), * (multiply), / (divide)
  Example: 3 + 5 * 2
• Brackets: ( ) 
  Example: 3 * (2 + 6)
• Compare: = (equal), <> (not equal), > (greater), < (less), >= (greater or equal), <= (less or equal)
  If the comparison resolves to true, the value is 10,000 ; if false, the value is 0 . For delta sensors the speed is compared.
   

Internally, the status() function returns the downtime channel of the sensor in hundreds of percent (10,000 = 100%).

• true corresponds to a value of 10,000 which is a Down status.
• false corresponds to a value of 0 which is an Up status.

If you understand this, you are able to use more complex formulas.

Example  ( status(1031) + status(1032) + status(1033) + status(1034) ) >= 20000 This changes the factory sensor to a Down status if at least any two of the sensors with IDs 1031 , 1032 , 1033 , or 1034 are Down . Otherwise the factory sensor shows an Up status.

Note: You can also use the status() function in channel definitions. Using this functionality, it is possible, for example, to display the numeric status value of sensors in a factory sensor channel

PRTG HTML Manual

Status Definition


This field is only visible if you enable custom formula above. Define when the sensor will switch to a Down status. You can use the status() function in combination with Boolean operations. For advanced users it is also possible to calculate a status value. Please see section Define Sensor Status below.

If a Sensor Has No Data

Choose how this Sensor Factory sensor reacts if a sensor referred to in the channel definition does not provide any data (for example, because it is paused or does not exist). Choose between:

    Do not calculate factory channels that use the sensor: For defined channels that use one or more sensor(s) that deliver no data, no data is shown. Additionally, the factory sensor shows a Warning status.

    Calculate the factory channels and use zero as source value: If a sensor that you use in a channel definition does not deliver any data, zero values will be filled in instead. The sensor factory calculates the channel value and shows it using these zero values.