Every trend has no, 3, or 6 limits. If a trend has limits, the Warning, Alarm and Critical alarm can be for exceeding (upper) or falling below (lower) the set limits. These limits are used for alarms. They can be viewed by expanding the trend in the legend.

When assigning the limits, the Alarm value (solid red line) is used as the base value (100%) and the other two values are set as follows, if the 3 limits are linked to fixed factors:

• The Warning value (solid orange line) corresponds to 70% of the alarm value.

• The Critical alarm value (dark red dotted line) corresponds to 250% of the alarm value.

After separating the linking of the 3 alarm values, they can be freely defined by entering each limit manually. Whether or not there is a dependency with a fixed factor can be seen by the symbol of two rings, one inside the other. If this symbol is crossed out, there can be a different factor.

There are two ways to change the limits in the trend analysis.

1. Manually entering the new value in the text field

2. Moving the line in the absolute view

A trend without measurement ranges can have no, 1 or 2 limit settings. Here, the type of limit can be changed by clicking on the arrow symbol. Limit settings are upper limit, which has to be exceeded (arrow upwards), and lower limit, which the value has to fall below (arrow downwards). The trash can icon can be used to delete limits and the + icon to add them. Trends with measurement ranges can have 0 to n x 2 limits, where n is the number of set measurement ranges.