Siemens S7-1200 System Manual page 621

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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.

Be aware of the following issues when using the standard Variable Status page:

• Enclose all string modifications in single quotes.

• The Variable Status page cannot monitor or modify tags that contain any of the following

• 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, 03/2014, A5E02486680-AG

characters: &, <, (, +, ,(comma), ., [, ], $, or %. For example, you cannot monitor the tag

"Clock_2.5Hz".

198 characters.

Variable Status page:

– 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.

location of the decimal point). Entering more than 15 digits creates a rounding error.

11.5 Standard Web pages