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01/2008 "Program" operating area

6.5 Multi-channel step sequence programming (option)

SINUMERIK 840Di sl/840D sl/840D Operating Manual HMI-Advanced (BAD) - 01/2008 Edition 6-277

Evaluation and optimization Reposition the steps or synchronization points (WAITM()) so that

multi-channel execution improves parallelism and therefore shorter

workpiece processing times:

• Select extremely long steps and analyze the environment

• Redistribute some tasks across the channels (e.g., break down

longer-lasting steps so that processing can be carried out by

several channels in parallel)

• Optimize synchronization between the channels

• Change the technological process (e.g., use steel profiles or

special tools with a shorter processing time)

Additional information

After making changes to the program, you need to process the

workpiece again to compute the new times.

Programs which have been modified are marked with a red X until the

times have been updated.

If timing has not been performed, all steps in the program are

displayed with equal time lengths. The computed times are saved in a

.DAT file for each workpiece.

6.5.3 Activating simulation

Function

The multi-channel step sequence display also supports multi-channel

simulations. Here, the NC language labels such as WAIT2: WAITM

are inserted in the NC part program. The labels are removed again

when you exit the simulation and return to multi-channel step

sequence display.

The labels continue to remain in place, if you are in the simulation or

in the correction editor and also:

• The control is switched off.

• The write access for the opened file is canceled.

Multi-channel, section by section program simulation

There are specific NC instructions for program coordination for

synchronizing program execution as required for multi-channel

manufacturing of workpieces: (INIT(..), START(..), WAITM(..) etc.). In

principle, they can be used to start independent program sections in

parallel channels almost simultaneously and synchronize them via e.g.

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