24-2
IM PX8000-02EN
24.2 Using the NULL Feature
This section explains the following settings for the NULL feature.
• Turning NULL value subtraction on and off
Turning on and off at once, setting each channel separately
• Turning NULL value updating on and off
Turning on and off at once, setting each channel separately
• Enabling and Disabling the NULL Feature
► Features Guide: “NULL Feature (NULL SET)”
Configuring NULL Feature Settings
Press SHIFT+NULL (NULL SET) to display the following screen.
To collectively set all the channels of installed modules, set the items in the All row.
Use the jog shuttle to select the item that you want to set.
Collectively turns
NULL value
subtraction on
and off
Collectively
turns NULL
value updating
on and off
Set individual channels.
Select the channels on which to execute NULL value subtraction or
NULL value updating.
Enabling and Disabling the NULL Feature
Press NULL. The NULL feature is executed, and a NULL indicator appears in the element information
display area on the right side of the screen.
• The NULL value of each signal is used for those channel signals whose NULL feature is set to ON.
• If you press the NULL key again, the NULL feature is disabled, and the NULL indicator disappears.
Element information
You cannot see this information when a setup menu is displayed.
To see the information, press ESC to clear the menu.
Note
If the measured value of the input signal used as a NULL value is not available (no measured value or
measurement error), even if “NULL value updating” of the signal is set to ON, an error will occur because the
NULL value will not be updated.
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