Siemens SINUMERIK 840D sl Function Manual page 1333

Note
Programs generated with an earlier software version that utilize the interface DBs described
above can also be converted into symbol programs. A fully qualified instruction for data
access e.g. "U DB31.DBX 60.0" is then necessary here for (spindle/ no axis) in the program
created till now. This command is converted upon activation of the symbolics in the editor
"AxisX.E_SpKA".
Description
Abbreviated symbolic names of the interface signals are defined in the two STL files
NST_UDTB.AWL and TM_UDTB.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 names are based on the English language. The comments are in English.
The symbolic names, commands and absolute addresses can be viewed by means of a
STEP 7 editor command when the UDT block is opened.
Note
Unused bits and bytes are listed, for example, with the designation "f56_3".
"56": Byte address of the relevant data block
"3": Bit number in this byte
2.7.9 M decoding acc. to list
Description of functions
When the M decoding according to list function is activated via the GP parameter of
FB1 "ListMDecGrp" (number of M groups for decoding), up to 256 M functions with extended
address can be decoded by the basic program.
The assignment of the M function with extended address and the bit to be set in the signal
list is defined in the decoding list. The signals are grouped for this purpose.
The signal list contains 16 groups with 16 bits each as decoded signals.
There is only one decoding list and one signal list i.e. this is a cross-channel function.
The M functions are decoded. Once they are entered in the decoding list, then the
associated bit in the signal list is set.
When the bit is set in the signal list, the readin disable in the associated NCK channel is set
simultaneously by the basic program.
Basic logic functions: PLC basic program solution line (P3 sl)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
2.7 Structure and functions of the basic program
Detailed description
59