Configuring Hardware and Communication Connections STEP 7.pdf

13.5.4 Filling Out the GD Table
Requirement
Configuring Global Data Communication
The scan rates and the GD status must be toggled off in the GD table.
Entering CPUs in the Table Header
1. In the global data table, click on a column in the table header. The column is
then selected.
2. Select the menu command Edit > Assign CPU. The dialog box "Open" will
then appear. Alternatively, you can open this box by double-clicking the column
header.
3. Select the current project and double-click to open the station for the required
CPU.
4. Select the CPU and confirm your selection by clicking "OK."
Result: The name of the selected CPU is displayed in the table header.
Entering Data in GD Rows
Requirement: You must have entered the relevant CPU in the table header (see
above).
1. Position the cursor in a table cell and enter the required address. You can only
enter absolute addresses (for example, IW0); symbolic entries are not
possible.
Tip: A set of continuous addresses of the same data type requires only one
entry in the global data table. In this case, enter a colon after the address and
then the repetition factor. The repetition factor defines the size of the data area.
Example: IW4: 3 means: 3 words from IW4.
2. Switch from overwrite to insert mode by pressing the F2 key.
3. Edit the table as you would normally. You can also use the menu commands
Edit > Cut, Edit > Copy, or Edit >Paste.
4. Finish your entries with RETURN.
Note
In a GD circle, use only either the communication bus (within an S7-400 station) or
the MPI subnet (outside the stations). Mixed operation is not possible.
Configuring Hardware and Communication Connections with STEP 7
A5E00706939-01 13-15