The temperature table on the Duet Web Console includes textfields for both Active and Standby temperatures of the extruder. The active temperature represents the temperature, in degrees Celsius, that the tool will go to when it is selected. If no tool is selected, no nozzle will heat up. This is the case whenever a print is cancelled. The firmware will deselect all tools. To gain temperature control again, select your desired tool. The standby temperature is the temperature the tool will go to when it is not selected, but was previously selected. This is useful for printing with the K'tana to avoid long heat-up times in between filament switches or collisions with the print.