Siemens CPU 313C Hardware And Installation Manual page 130

&RPPLVVLRQLQJ
 0RQLWRULQJ DQG FRQWUROOLQJ ,2V
7KH WRRO 0RQLWRULQJ DQG &RQWUROOLQJ D 9DULDEOH
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).
&UHDWH D YDULDEOH WDEOH
You have two options for creating a variable table (VAT):
• in the ladder diagram/sequential function chart/statement list editor via menu
item 3/& ! 0RQLWRUFRQWURO YDULDEOH
This table is also available directly online
• in SIMATIC Manager with the %ORFNV container open via menu item ,QVHUW QHZ
REMHFW ! 9DULDEOH WDEOH
This table created offline can be saved for future retrieval. You can also test it
after switching to online mode.
9$7 VWUXFWXUH
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
9-18
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)
S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
7KLV ILHOG 
A5E00105492-03