User Manual

6 OPERATION
74
OPTIWAVE 7400-24 C
www.krohne.com 12/2015 - 4003518001 - MA OPTIWAVE7400-24-R01-en
How to change from point-to-point to multidrop mode
• Enter the supervisor menu.
• Push [>
>>
>], 5 × [

] and [>
>>
>] to go to menu item ADDRESS (2.6.1).
• Push [>
>>
>] to change the value. Enter a value between 1 and and push [^
^^
^] to confirm (refer to
the caution before this procedure).
• Push [^
^^
^] to go back to the "STORE" screen.
• Push [

] or [

] to set the screen to STORE YES
STORE YESSTORE YES
STORE YES and push [^
^^
^].
i The output is set to multidrop mode. The current output is set to 4 mA. This value does not
change in multidrop mode.
How to change from multidrop to point-to-point mode
• Enter the supervisor menu.
• Push [>
>>
>], 5 × [

] and [>
>>
>] to go to menu item ADDRESS (2.6.1).
• Push [>
>>
>] to change the value. Enter the value 0 and push [^
^^
^] to confirm.
• Push [^
^^
^] to go back to the "STORE" screen.
• Push [

] or [

] to set the screen to STORE YES
STORE YESSTORE YES
STORE YES and push [^
^^
^].
i The output is set to point-to-point mode. The current output changes to a range of 4...20 mA
or 3.8...20.5 mA (this range is set in menu item RANGE I (2.4.2)).
6.4.5 Distance measurement
The device displays distance measurements when the output function is set to "Distance".
Menu items related to distance measurement are:
• Output Function (2.4.1)
• Tank Height (2.3.1)
• Blocking Distance (2.3.2)
Use the flange facing as the reference point for the 4 and 20 mA current output settings. The 4
and 20 mA current output settings are the minimum and maximum points of the measurement
scale.
You can change the reference point from which distance is measured. Use this menu
item:
• Reference Offset (2.3.7)
CAUTION!
Make sure that the address for this device is different from others in the multidrop network.
INFORMATION!
If you move the reference point above the flange, add this value when you give a distance for the
4 and 20 mA current output settings. If you move the reference point below the flange, subtract
this value when you give a distance for the 4 and 20 mA current output settings.
CAUTION!
If the distance for 4 mA is set in the blocking distance, the device will not be able to use the full
current output range.