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Configuring the TD 200
Embedding Data Values in a Text Message
You can place a data value within the message that displays on the TD 200. In
order to display a data value, you must reserve space in the message for the data
value and for format information. The format information tells the TD 200 how to
display and edit the data value. The format information requires the space of two
characters in your message. Word data values require the space of two characters
in addition to the format information (four characters total). Double word or real
(floating point) values require the space of four characters in addition to the format
information (six characters total).
When you insert a data value into a message, you must be sure there are enough
characters to contain the format information and the embedded data value on the
current line of the display. For example, if you insert a word value, (two characters
for the word value and two characters for the format information), you must allow
at least four spaces between the starting position of the embedded data value and
the end of the current message line.
The right-most character of an embedded data value serves as the anchor point
for that value in the TD 200 display. Data values are always right justified to that
anchor point within messages on the TD 200 display. As a data value grows in
magnitude, it utilizes more spaces to the left of the anchor point and can begin to
use the spaces occupied by the message text. Be sure to leave sufficient space
between the end of your text and the anchor point to allow for the expected range
of the data value.
The number of display characters used to display a value varies with the size of
the value. This number of characters required to display a number is not the same
as the number of characters used to store the embedded data value in the
message. The number of display characters required depends on the range of
values for that number in a specific application. See Table D-2 for examples of the
number of display characters required for different display formats.
The TD 200 displays all values as decimal numbers. Positive signed values are
displayed without a sign. Negative signed values are displayed with a leading
minus sign. Unsigned values are displayed without a sign. A leading zero is used
for all fractional numbers (for example, 0.5). Real numbers are displayed with the
number of decimal places you specify. The value is rounded to the specified
decimal place.
2-10
SIMATIC TD 200 Operator Interface
C79000-G7076-C272-01
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