Siemens SINUMERIK 840Di Function Manual page 965

Symbolic names of virtually all the interface signals are defined in these UDT blocks.
The UDT numbers 2, 10, 11, 19, 21, 31, 71, 72, 73 are used.
The assignments have been made as follows:
UDT assignments
UDT
number
UDT 2
UDT 10
UDT 11
UDT 19
UDT 21
UDT 31
UDT 71
UDT 72
UDT 73
To symbolically program the interface signals, the interface data blocks must first be
symbolically assigned using the symbol editor.
For example, symbol "AxisX" is assigned to operand DB31 with data type UDT 31 in the
symbol file.
After this input, the STEP 7 program can be programmed in symbols for this interface.
Note
Programs generated with an earlier software version that utilize the interface DBs described
above can also be converted into symbol programs. To do so, however, a fully qualified
instruction is needed for data access in the earlier program (e.g., "U DB31.DBX 60.0" - this
command is converted to "AxisX.E_SpKA" when the symbols function is activated in the
editor).
Description
Abbreviated symbolic names of the interface signals are defined in the two STL files
NST_UDT.AWL and TM_UDT.AWL.
In order to create the reference to the names of the interface signals, the name is included in
the comment after each signal.
The symbolic names, commands and absolute addresses can be viewed by means of a
STEP 7 editor command when the UDT block is opened.
Power Line Basic PLC Program (P3)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
Assignment to interface DB
DB 2
DB 10
DB 11
DB 19
DB 21 to DB 30
DB 31 to DB 61
DB 71
DB 72
DB 73
2.7 Structure and functions of the basic program
Meaning
Alarms/Messages
NCK signals
Mode group signals
MMC signals
Channel signal
Axis/spindle signals
Tool management: Load/unload locations
Tool management: Change in spindle
Tool management: Change in revolver
Detailed description
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