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13 Part Program Configuration
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13 Part Program Configuration
The structure of the part program has been described already in the introduction presenting the
codes and formats of the programs in the memory. This Section will discuss the procedures of
organizing the part programs.
13.1 Sequence Number (Address N)
The blocks of the program can be specified with serial or sequence numbers. The numbering can be
accomplished at address N. The blocks can be numbered with max. 5 digits at address N. The use
of address N is not mandatory. Some blocks can be numbered, others not. The block numbers need
not follow each other in a consecutive order.
13.2 Conditional Block Skip
A conditional block skip can be programmed at the slash address /. The value of the slash address
may be 1 to 9. Digit 1 to 9 represents serial number of switches .
Switch CONDITIONAL BLOCK No. 1 can be found on the operator’s panel of control.
The other switches may be provided optionally, their signals can be entered through the interface of
the control system.
If a conditional block skip /n is programmed at the beginning of a block,
– that block will be omitted from the execution when the n
th
switch is on,
– that block will be executed when the n
th
switch is off.
13.3 Main Program and Sub-program
Two different programs are differentiated - main program and subprogram. Repetitive activities may
be involved in machining a component part, that can be described with a particular program detail.
In order to avoid writing the repetitive program detail over and over again in the program, they can
be organized into a subprogram to be called from the part program. The structures of the main
program and the subprogram have been described in the Introduction.
The difference between them is that, whereas the machining is completed after execution of the main
program the control is awaiting another START, while after execution of the subprogram it will
return to the calling program, resuming the machining process at that point.
In terms of programming technique, the difference between the two programs lies in the way of
terminating the program. The end of the main program is specified with codes M02 or M30 (not
mandatory ones), whereas the sub-program must be terminated with code M99.
13.3.1 Calling the Sub-program
The series of instructions
M98 P....
will generate a subprogram call. As a result, the execution of the program will be resumed at the
subprogram, the number of which is defined at address P. The limit of address P are 1 to 9999.
After the execution of the sub-program machining will be continued in the main program with the
block following the subprogram call.