Configuring Hardware and Communication Connections STEP 7.pdf

Configuring Global Data Communication
13.5.6 Entering Scan Rates
Introduction
Global data exchange occurs as follows:
• The sender CPU sends the global data at the end of a cycle.
• The receiver CPU reads the data at the start of a cycle.
With the aid of the scan rate, you can determine after how many cycles the data
will be sent or received.
Procedure
1. Compile the global data table if it is not already in phase 1 (you can view this
information in the status bar at the bottom edge of the screen).
2. If no scan rates are displayed in the GD table, select the menu command
View > Scan Rates.
3. Enter the required scan rates. You can enter data only in the columns in which
the GD packet in question has entries.
Note: When you view status rows and/or scan rate rows, you can edit these
rows only.
4. Compile the global data table again (phase 2).
Configuring Hardware and Communication Connections with STEP 7
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