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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
9-18 A5E00105492-03
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The STEP 7 tool "Monitoring and Controlling a Variable" lets you
• monitor program variables in any format,
• edit the status or data of variables in the CPU (controlling).
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You have two options for creating a variable table (VAT):
• in the ladder diagram/sequential function chart/statement list editor via menu
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This table is also available directly online
• in SIMATIC Manager with the %ORFNVcontainer open via menu item ,QVHUWQHZ
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This table created offline can be saved for future retrieval. You can also test it
after switching to online mode.
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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:
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Operand contains the absolute address of the variable
Symbol contains the symbolic descriptor of the variable
This is identical to the specification in the Symbol Table.
Symbol comment shows the symbol comment of the Symbol Table
Status format 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
Status value shows the content of the variable at the time of update
Control value is used to enter the new variable value (control value)
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