It is function to fix the specific analog/digital current value as you set, for reason of error etc of device.
If you select 'Set Temporary Value' at shortcut menu of Entire Tags, Digital Inputs and object related to digital of Graphic etc, dialog box is shown such as <Figure 1>.
<Figure 1> Example for Digital Temporary Value dialog box
After checking(V) the of <Figure 1>, set the digital input value(OFF or ON) at Input Value area.
Setting, cancelling and changing the temporary value are processed as alarm.
Relate items)