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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
A5E00105492-03
9-21
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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/&!&RQQHFWWR, establish a connection to one of the following
CPUs:
• configured CPU
• directly connected CPU
• available CPU ...
The table below lists the display of variables.
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configured CPU in their S7 program (Hardware Station) in which the VAT is
stored.
directly connected CPU that is connected directly to the PG.
available CPU. that is selected in the dialog window.
Menu item 3/&!&RQQHFWWR!$YDLODEOH&38 is
used to establish a connection to any CPU available on
the network.
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The function(QDEOH32 switches off output disable for the peripheral outputs
(PO), thus enabling control of the PO in CPU STOP mode.
In order to enable the POs, proceed as follows:
1. In menu item 7DEOH!2SHQWKHYDULDEOHWDEOH9$7, open the VAT that
contains the PO you want to control, or activate the window containing the
corresponding VAT.
2. To control the PO of the active VAT, select the CPU connection in menu
command 3/&!&RQQHFWWR.
3. Use menu command 3/&!2SHUDWLQJ0RGH to open the 2SHUDWLQJ0RGH
dialog and switch the CPU to STOP mode.
4. Enter your values in the "Control value" column for the PO you want to control.
Example:
PO: POB 7 control value: 2#0100 0011
POW 2 W#16#0027
POD 4 DW#16#0001
5. Use menu item 9DULDEOH!(QDEOH32 to switch to "Enable PO" mode.
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