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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
9-20 A5E00105492-03
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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!6HW7ULJJHUstart.
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• If "Trigger condition for monitoring" is set to RQFH, the menu items 9DULDEOH!
8SGDWHVWDWXVYDOXHor9DULDEOH!0RQLWRU have the same effect, namely a
single update.
• If "Trigger condition for controlling" is set to RQFH, the menu items 9DULDEOH!
8SGDWHFRQWUROYDOXHor9DULDEOH!&RQWURO have the same effect, namely a
one-time assignment.
• If trigger conditions are set toSHUPDQHQW, the said menu items have different
effects as described above.
• If monitoring and controlling is set to the same trigger point, monitoring is
executed first.
• With some CPU versions (e.g. CPU 314-1AE03) values are not assigned at
every cycle when SHUPDQHQWFRQWUROis set.
Remedy: Use the testing function)RUFH.
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1. After you abort or complete a test phase, you can save the variable table to
memory. The name of a variable table starts with the letters VAT, followed by a
number from 0 to 65535; e.g. VAT5.
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1. Select the menu item 7DEOH!2SHQ.
2. Select the project name in the2SHQdialog.
3. In the project window below, select the relevant program and mark the %ORFNV
container.
4. In the block window, select the desired table.
5. Confirm with2..
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