Siemens CPU 312C

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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
A5E00105492-03
9-19
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You have two options for monitoring variables:
• updating the status values once via menu item 9DULDEOH!8SGDWHVWDWXV
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or
• continuous update of status values via menu item 9DULDEOH!0RQLWRU
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To control variables, proceed as follows:
1. Left-click the field &RQWUROYDOXH of the relevant variable.
2. Enter the control value according to the data type.
3. To update control values once, select the menu item 9DULDEOH!(QDEOH
FRQWUROYDOXHV.
or
Enable control values permanently via menu item 9DULDEOH!&RQWURO.
4. In the 0RQLWRU test function, verify the control value entry in the variable.
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You can disable the control value entered in the table. An invalid value is displayed
same as a comment. You can re-enable the control value.
Only valid control values can be enabled.
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• The "Trigger point for monitoring" determines the time of update for values of
variables to be monitored.
• The "Trigger point for controlling" determines the time for assigning the control
values to the variables to be controlled.