Siemens SINUMERIK 840C Operator's Manual page 131

4 Machine
DRF
DSB
PST
BRK
CLR
4-64
DRF; Display DRF (Differential Resolver Function).
You have enabled "DRF" (Differential Resolver Function). It is now possible
to traverse an axis which has still to be selected, with the handwheel in
AUTOMATIC mode AUTOMATIC mode.
Decoding single block; Display DSB (DECODING SINGLE BLOCK).
After NC START, only one block is executed, even if it does not contain a
traversing movement or an auxiliary function (e.g. R parameter calculation).
The signal acts at the end of the block preset by being decoded in the current
part program.
Program step; Display: PST (Procedure Step)
PST is a type of single block mode. Main program blocks are executed as
individual blocks. A subroutine with all its nested subroutine levels is executed
as a single unit. During subroutine execution the advance decoding is enabled.
Machine tool compensation and contour definition are therefore possible
within subroutines. When you return from the subroutine to the main program
level, the advance decoding is switched off and the block sequence is
interrupted. The main program block following the subroutine call is not
executed. When PST is active, DSB and BRK are switched off and vice-versa
(1 of 3 principle).
Stop at target block; Display: BRK (Break)
This feature allows you to interrupt the program at a defined point. The target
block is selected by means of the
− Cursor functions and
− SET STOP POINT softkey
When the target block has been executed, the advance decoding is switched off
and the block sequence is interrupted. When BRK is active, PST and DSB are
switched off and vice-versa (1 of 3 principle).
Clear; Display: CLR (Clear)
CLR is only effective in MDA mode (not in the MDA mode in TEACH IN
mode). If CLR is active, the entered MDA blocks are deleted after program
end, reset or mode change. If CLR is not active, the MDA blocks are retained.
Machine manufacturer
The program modification signals (except for ACR) do not act directly, i.e.
they can be configured by the machine manufacturer via the PLC program.
See also the machine manufacturer's documentation.
6FC5198-6AA60-0BP1 © Siemens AG 1999 All Rights Reserved
SINUMERIK 840C, OEM Version for Windows (BA)
01.99