Siemens S7-300 - Page 132

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S7-300 Automation System, Hardware and Installation: CPU 312IFM - 318-2 DP
9-20 A5E00203919-01
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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
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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.
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• The "Trigger condition for monitoring" determines whether to update values
once when the trigger point is reached or continuously every time the trigger
point is reached.
• The "Trigger condition for controlling" determines whether to assign control
values once or permanently to the variable to be controlled.
You can customize the trigger points using the tool "Monitor and control variable" in
menu item 9DULDEOH!6HW7ULJJHUstart.