Here's how to set it up. There's 1 tricky part as you don't want to update the range constantly with the current time. Therefore we need to first store the current time in a variable instead of directly using it in the Range of the chart.

On the page:

• InitVar => [sep::$]Now$[DataMinerTime] (note the sep is necessary because in our culture DataMinerTime outputs a value with ':' characters)
• Options => PageVariable

On the trend graph

• ParametersOptions => Range:Start=[subtract:[pagevar:Now],2.00:00:00],End=[pageVar:Now]

Relevant help links other than DataMinerTime and InitVar:

• Trend component configuration
• Subtract placeholder