Siemens Sinumerik 840D Operating Turning page 115

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With the subprogram technique any repeatable contour elements of the

work piece or special technological machining sequences can be pro-

grammed very effectively.

A subprogram can be called up by any program and can be executed any

number of times.

Subprogram call-up:

The call-up is effected simply by stating the name in the calling program.

Programming example:

With the instruction "M17" in the subprogram the control unit jumps back to

the next block of the calling program following the call-up.

Contour elements that are to be executed at various geometrical loca-

tions on the same work piece must be programmed with incremental

The subprogram should not contain anything other than the geometrical

contour description. Hence the call-up of tools, rapid traverses, instruc-

tions regarding radius correction etc. must therefore be be dealt with in

the main program.

Modal instructions maintain their validity also after the jump back to the

main program. For this reason any instructions included merely for the

purpose of the subprogram (e.g. G91) must be cancelled before the

jump back to the main program.

840D/828D SINUMERIK Operate

Sinumerik 828d