Commissioning
S7-300 Programmable Controller Hardware and Installation
8-22 A5E00105492-01
• With some CPU versions (e.g. CPU 314-1AE03) values are not assigned at
every cycle when permanent control is set.
Remedy: Use the testing function Force.
Saving/Opening the Variable Table
Saving the VAT
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.
Opening the VAT
1. Select the menu item Table > Open .
2. Select the project name in the Open dialog.
3. In the project window below, select the respective program and mark the
Blocks container.
4. In the block window, select the desired table.
5. Confirm with OK.
Establishing a connection to the CPU
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 respective
CPU. Every variable tables can be linked to another CPU.
In menu item PLC > Connect to ... , establish a connection to one of the following
CPUs:
• configured CPU
• directly connected CPU
• available CPU ...
The table below lists the display of variables.
CPUs The CPU variables are displayed, ...
configured CPU in their S7 program (HW 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 PLC > Connect to ... > Available CPU ... is
used to establish a connection to any CPU available on
the network.
Controlling outputs in CPU STOP mode
The function Enable PO 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:
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