Siemens SITRANS LR 400 Instruction Manual

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Contents

7ML19985FH01 SITRANS LR 400 ñ INSTRUCTION MANUAL DRAFT Page 21mmmmmOperationEntering Manual ValueIf the device allows manual input of the displayed parameter, the control elementsoperate like a cursor control. The current input position is marked by flashing of a singlecharacter.ï The control elements and change the characterís value by one up ordown. For numeric values the character changes to the next digit up or down, forsigns between + and -, and for text inputs to the next element of the ASCII characterset.ï Use the control element to move the input position to the right. At the extremeright position, press again: Here the control element operates like an ìEnterîkey. The device saves the changed value (if it is within the permissible input range ñotherwise an error message appears on the operating and monitoring module!) andcloses the parameter input.ï Use the control element to move the input position to the left. At the extreme leftposition, press again: The control element now functions as a ìCancelî key. Thedevice close the parameter input without saving the changed value.If you exceed the representable value range when entering a digit, SITRANS LR 400automatically places the numeric value at the next highest position. For example, if yousee the numeric value ì0.9î on the display and press the control element , the displaydoes not change to ì0.0î but to ì1.0î. Value ì9î becomes ì10î, value ì90î or ì99î, ì100î(depending on whether you have set the input position to the second or first ì9î), etc. Thedevice adds further places before the decimal point automatically!This input system also works in the opposite direction: If, for example, the value ì100î isdisplayed and you use the control element on the first or second ì0î, the numericvalue changes to ì90î or ì99î and the device cancels the places in front of the decimalpoint 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 currentlybeing displayed). The control elements or then immediately multiply or dividethe displayed value by 10. The necessary additional places in front of the decimal pointappear. However, you cannot change the number of displayed decimal places; theyalways remain the same.Display text assigned to a parameter may sometimes be longer than the field of thedisplay. An arrow pointing outward on the right or left hand side of the display lineindicates that the text continues outside the display. You can move the text with thecontrol elements and by moving the pointer past the end of the line allowing you toread the rest of the text.An example of manual input of a value is described in ìOperating examplesî on page 23,example 2.