Web server
12.8 Constraints
S7-1200 Programmable controller
1084 System Manual, V4.2, 09/2016, A5E02486680-AK
Rules for entering tag names and values
Be aware of the following conventions when using the Tag status (Page 1031) and Watch
tables (Page 1033) standard pages:
● If modifying the entire value of a DTL tag, for example, "Data_block_1_.DTL_tag, use the
following DTL syntax for the modify value: DTL#YYYY-MM-DD-HH-MM-SS[.sssssssss]
● When using exponential notation to enter a value for a Real or LReal data type:
– To enter a real-number value (Real or LReal) with a positive exponent (such as
+3.402823e+25), enter the value in either of the following formats:
+3.402823e25
+3.402823e+25
– To enter real-number value (Real or LReal) with a negative exponent (such as
+3.402823e-25), enter the value as follows:
+3.402823e-25
– Be sure that the mantissa portion of the real value in exponential notation includes a
decimal point. Failure to include a decimal point results in the modification of the value
to an unexpected integer value. For example, enter -1.0e8 rather than -1e8.
● LReal values can be only 15 digits (regardless of the location of the decimal point).
Entering more than 15 digits creates a rounding error.
Limitations on the Tag status and Watch Table page:
● The maximum number of characters for the URL is 2083. You can see the URL that
represents your current page in the address bar of your browser.
● For the character display format, if the actual CPU values are not valid ASCII characters
as interpreted by the browser then the page displays the character preceded by a dollar
sign: $.
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