Siemens simatic hmi op7, Руководство по эксплуатации оборудования

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3-7
Equipment Manual OP7, OP17
Release 04/99
3.2.1 Entering Numerical Values
You enter numerical values character-by-character (digit-by-digit) via the
input keys of the system keyboard. If the field already contains a value, this
entire value is deleted from the field as soon as you enter the first new char-
acter. Once you have begun entering a value, you can no longer quit this field
until you have confirmed or canceled your input.
The following values can be entered in numerical input fields:
Possible values Keys Description
Decimal value
0
...
9
+/– .
,
The input keys of the system key-
pad belong to the numerical key
assignment.
Hex value
A
...
0 9 ...
F
To enter characters A...F, the input
keys must be switched over to the
alphanumerical key assignment.
Digital value
0
1
,
The input keys belong to the nume-
rical key assignment.
In numerical fields, input initially is normally right-justified. Digits that have
already been entered are moved to the left (pocket calculator format).
Exception:
Input fields for tags in KM format – for instance, when calling the functions
Status/Force Var – are changed to left-justified. When input begins, the old
value does not disappear from the display completely but its bit pattern is
overwritten one character at a time. You move the cursor in this type of field
by pressing
or with activated Shift Lock mode.
You can configure limit values for numerical input fields. In this type of
field, a limit-value check takes place, i.e. the entered values are applied only
if they lie within the configured limits. If a value outside these limits is en-
tered, a system message is displayed and, after it has been canceled, the old
value is restored in the field.
If a numerical field has been configured with a certain number of decimal
places and too many have been entered, they are ignored; if too few have
been entered, the field is padded with zeroes.
Entering via
system keys
Possible values
Right-justified
input
Limit-value check
Decimal places