04/99 Programming Preparations
Getting Started with C7-621-AS-i 17
Setting up a bit memory address area for clock memories
Clock memories are bit memories which periodically modify their binary value (pulse-pause ratio: 1:1).
You need these memories in the following programming example.
To enable you to set up the clock memory, you must make the following settings.
In the Hardware Configuration window open the dialog window
Properties - C7-CPU621
by double-
clicking on the
C7-CPU-621 icon.
In the dialog window displayed, click on the tab sheet
Cycle / Clock Memory
to select it.
Þ Activate the
Clock Memory
checkbox and enter 10 for the number of the memory byte.
Each bit of the clock memory byte is assigned a period time/frequency:
Bit 76543210
Period time (s) 2 1,6 1 0,8 0,5 0,4 0,2 0,1
Frequency (Hz) 0,5 0,625 1 1,25 2 2,5 5 10
Confirm your entries with OK. To save the configuration, select
Station
→
Save and Compile
from the
menu bar.
To close the
Hardware Configuration
window select
Station
→
Exit
from the menu bar.
In the
SIMATIC_Manager
thefolderC7
CPU621
containing the S7 program is created automatically. This
S7 Program folder in turn contains the folder Blocks with an empty organization block OB1.
Open each folder with a double click.
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