Email setup for Profilux4 Level-Sensors

This is the mail i recive.
What does

Code:

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1

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and

Code:

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+2

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mean ?

Adding the description would be nice here too.

Quote:

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Levelcontrol 1 : + 2
Levelcontrol 2 : 1
Levelcontrol 3 : + 2
Levelcontrol 4

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The meaning of the numbers are explained on page 66 of our programming guide, see 6.4 Diagnostic. Please refer to that section.

Seems like it reefers to Level controll cicuit instead of Level input ?
Whats the does the pluss before the number mean ? "+ 2" vs "1"

6.4 Diagnostic
To facilitate the implementing of the level sensors, the menu item Diagnostic is available. The current state of all level sensor inputs is displayed here. On contact with water (= sensor active) the corresponding number of the sensor input is displayed.
The display of "1 4 8" means that sensor inputs 1, 4 and 8 signal contact with water.
Please note that a "contact with water" is also displayed when no sensor is connected. The diagnosis is terminated with Esc.