Operating Your Text Display (TD) Device
5.5 Viewing the Screens and the Alarms
Text Display (TD) User Manual
116 System Manual, 08/2008, A5E00765548-03
Notice
Due to restrictions in the format used to store real (floating-point) numbers in both the S7-
200 CPU and the TD device, the accuracy of the number is limited to six significant digits.
Editing a real number with more than six digits may not change the value of the variable, or
may cause other digits within the number to change:
● Changing the least significant (right-most) digit of a real-number variable with more than
six digits may have no effect. For example, if you try to change the "9" in "1234.56789",
the value of the variable does not change.
● Changing the most significant (left-most) digit of a real-number variable with more than
six digits may cause other (less significant) digits in the variable to change.
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