Siemens S7-300 Installation Manual page 133

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• If "Trigger condition for monitoring" is set to RQFH , the menu items 9DULDEOH !
8SGDWH VWDWXV YDOXH or 9DULDEOH ! 0RQLWRU have the same effect, namely a
single update.
• If "Trigger condition for controlling" is set to RQFH , the menu items 9DULDEOH !
8SGDWH FRQWURO YDOXH or 9DULDEOH ! &RQWURO have the same effect, namely a
one-time assignment.
• If trigger conditions are set to SHUPDQHQW , 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 SHUPDQHQW FRQWURO is 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 the 2SHQ dialog.
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 with 2..
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The variables of a VAT represent variable quantities of a user program. In order to
monitor or control variables it is required to establish a connection to the relevant
CPU. Every variable tables can be linked to another CPU.
In menu item 3/& ! &RQQHFW WR  , establish a connection to one of the following
CPUs:
• configured CPU
• directly connected CPU
• available CPU ...
S7-300 Automation System, Hardware and Installation: CPU 312IFM - 318-2 DP
A5E00203919-01
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