Siemens S7-300 Installation Manual page 131

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In the VAT, every address to be monitored or modified (e.g. inputs, outputs)
occupies one row.
The meaning of the VAT columns is as follows:
&ROXPQ WH[W
Operand
Symbol
Symbol comment
Status format
Status value
Control value
0RQLWRULQJ YDULDEOHV
You have two options for monitoring variables:
• updating the status values once via menu item 9DULDEOH ! 8SGDWH VWDWXV
YDOXHV
or
• continuous update of status values via menu item 9DULDEOH ! 0RQLWRU
S7-300 Automation System, Hardware and Installation: CPU 312IFM - 318-2 DP
A5E00203919-01
contains the absolute address of the variable
contains the symbolic descriptor of the variable
This is identical to the specification in the Symbol Table.
shows the symbol comment of the Symbol Table
contains the default format setting, e.g. HEX
You can change the format as follows:
•
Right-click on the format field. The Format List pops up.
or
•
Left-click on the format field until the desired format appears
shows the content of the variable at the time of update
is used to enter the new variable value (control value)
&RPPLVVLRQLQJ
7KLV ILHOG 
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