P4: PLC for SINUMERIK 828D
14.3 Programming
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
1095
Figure 14-2 Example of a project structure
Symbol tables
The symbol table is used for symbolic addresses. Frequently, symbols simplify programming and increase the
transparency of programs. In the compiled program, which is loaded into the target system, all of the symbols are
converted into absolute addresses. The data relating to the symbol table are loaded into the target system.
Status table
In the status tables, you can observe how the process values change as the program is executed. Status tables
are not loaded into the target system. They are only intended to be able to monitor the activities of the target
system (or the simulated target system).
Cross references
The following are displayed in tabular form in the cross reference window:
• the symbolic or absolute addresses and the locations where they are used
• the bytes that are being used
• the bits that are being used
The cross references and the data on the elements used are not loaded into the target system.
0DQXIDFWXUHU
,QGLYLGXDO
8VHU
'%DFWXDOYDOXHV
'DWDEORFNVRQO\DFWXDOYDOXHV
0DQXIDFWXUHU ,QGLYLGXDO
3URJUDPFRGHFRPPHQWV
FURVVUHIHUHQFHVV\PERODQGVWDWXVFKDUWV
YDULDEOHVFRQVWDQWV
'%VWUXFWXUHDQG'%LQLWLDOYDOXHV
%ORFNV0$,16%5,17'%
3URMHFWLQWKH3URJUDPPLQJ7RRO3/&
'%
'%
'%
'%
0$,1
,17
,17
,17
6%5
6%5
6%5
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