User's Manual

7ML19985FH01 SITRANS LR 400 – INSTRUCTION MANUAL DRAFT Page 21
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Operation
Entering Manual Value
If the device allows manual input of the displayed parameter, the control elements
operate like a cursor control. The current input position is marked by flashing of a single
character.
• The control elements and change the character’s value by one up or
down. For numeric values the character changes to the next digit up or down, for
signs between + and -, and for text inputs to the next element of the ASCII character
set.
• Use the control element to move the input position to the right. At the extreme
right position, press again: Here the control element operates like an “Enter”
key. The device saves the changed value (if it is within the permissible input range –
otherwise an error message appears on the operating and monitoring module!) and
closes the parameter input.
• Use the control element to move the input position to the left. At the extreme left
position, press again: The control element now functions as a “Cancel” key. The
device close the parameter input without saving the changed value.
If you exceed the representable value range when entering a digit, SITRANS LR 400
automatically places the numeric value at the next highest position. For example, if you
see the numeric value “0.9” on the display and press the control element , the display
does not change to “0.0” but to “1.0”. Value “9” becomes “10”, value “90” or “99”, “100”
(depending on whether you have set the input position to the second or first “9”), etc. The
device adds further places before the decimal point automatically!
This input system also works in the opposite direction: If, for example, the value “100” is
displayed and you use the control element on the first or second “0”, the numeric
value changes to “90” or “99” and the device cancels the places in front of the decimal
point which are no longer required. Leading zeros are not displayed.
You can also set the cursor to the decimal point (unless an integer value is currently
being displayed). The control elements or then immediately multiply or divide
the displayed value by 10. The necessary additional places in front of the decimal point
appear. However, you cannot change the number of displayed decimal places; they
always remain the same.
Display text assigned to a parameter may sometimes be longer than the field of the
display. An arrow pointing outward on the right or left hand side of the display line
indicates that the text continues outside the display. You can move the text with the
control elements and by moving the pointer past the end of the line allowing you to
read the rest of the text.
An example of manual input of a value is described in “Operating examples” on page 23,
example 2.
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