Siemens SINUMERIK 840Di sl - Page 278

6
"Program" operating area 01/2008
6.5 Multi-channel step sequence programming (option)
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6-278 SINUMERIK 840Di sl/840D sl/840D Operating Manual HMI-Advanced (BAD) - 01/2008 Edition
WAITM(Marker No., ...) once the associated machining operations
have been executed and before starting the next sections.
Simultaneous aspects can only be sequentially emulated with
simulation. NC program labels serve to mark program sections.
Emulating the multi-channel program coordination in the simulation
assumes that NC instructions for program coordination were marked
with NC labels (manually or automatically during program generation).
Simultaneous operational sequences which are independent of one
another are executed one after the other in the respective channels
(channel change per section required), before sequences are created
for the next sections in the same manner. The result in the simulation
is a similar sequence of machining steps to that on the machine.
Limitations
• Only one out of 10 possible channel instances can be assigned to
the single-channel graphic module (simulation display) at any one
time (no simultaneous mode for channels!). Commands for multi-
channel program coordination (INIT(..), START(..), WAITM(..) etc.)
are not executed in the program interpreter for the simulation.
• Partial processing of the "channels" on the same stationary blank
are superimposed.
• Path labels are universal markings/section structure aids in NC
programs which can trigger specific actions during the simulation
run:
- Path labels can be optionally displayed in the graphic
- The intermediate time can be computed for sections delimited by
path labels.
- The graphic state can be stored temporarily for sections that are
delimited by path labels.
Path labels have a defined label syntax: Identifiers for simulation
should exist singly in one NC block in so far as possible.
• The channel changes section by section with defined path labels
(NC program labels).
Section limitation using path
labels
If the "Stop label" column is clearly defined, the "Start label" is created
implicitly:
• An empty "Start label" field has the same meaning as a start from
the beginning of the program
•
A
n empty "Stop label" field has the same meaning as a stop at the
end of the program
• With the same "program name", the "start label" of a section is
equal to the "stop label" of the preceding section
• If start and stop labels are not specified, the entire program is
executed.