Siemens SIMATIC S7 System Manual page 485

①
If you leave the Variable Status page and return, the Variable Status page does not retain
your entries. You can bookmark the page and return to the bookmark to see the same
entries. If you do not bookmark the page, you must re-enter the variables.
Note
Be aware of the following issues when using the standard Variable Status page:
 The Variable Status page does not allow you to modify a string longer than
 When using exponential notation to enter a value for a Real or LReal data type in the
 The Variable Status page supports only 15 digits for an LReal value (regardless of the
S7-1200 Programmable controller
System Manual, 11/2011, A5E02486680-05
The "Modify Value" functionality is only visible and accessible when you are logged in as the
"admin" user.
198 characters.
Variable Status page:
– To enter a real-number value (Real or LReal) with a positive exponent (such as
+3.402823e+25), do not enter the "+" for the exponent. Instead of entering
"+3.402823e+25", you must enter the value in the following format:
+3.402823e25
– To enter real-number value (Real or LReal) with a negative exponent, enter the value
as follows:
+3.402823e-25
location of the decimal point). Entering more than 15 digits creates a rounding error.
104BWeb server
11.2 Standard web pages
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