Siemens Sinumerik 840D Operating Turning page 119

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Program jumps and deletion blocks

2.1 Program jumps

In practice it is often necessary to interrupt the block-by-block execution of

the program and to jump to another part of the program.

Certain number of blocks should not be executed by the control unit for

instance when testing a program.

Since the control does not recognize the block numbers, the jump destina-

tion must always be identified by markers (labels).

The Marker may be any chain of characters followed by a colon, however,

the chain of characters must not be identical to any command of the con-

Example: N100 LBL8

If for instance a section of the program is to be left out, the jump instruction

GOTOF can be used.

This instruction searches for the jump destination only in the forward direc-

tion of the program. The program will then be continued from there on in

the normal manner.

N10 G18 G54 G64 LIMS=3000

N20 G00 X200 Z300

N30 GOTOF LBL8

Roughing tool

N50 G96 S160 F0.2 M4 D1

N60 G00 X82 Z0.2 M8

N70 G01 X-1.6

N90 G00 X200 Z300

Finishing tool

N120 G96 S200 F0.15 M4 D1

N130 G00 G42 X0 Z2 M8

To initiate a backward jump in the program the instruction GOTOB must be

The backward jump will result in an endless loop if the number of runs is

not limited (see section 4).

Markers will be ignored by the control unit if there is no jump command to

the marker. In no way will the execution of the program be affected by a

marker without a jump instruction.

840D/828D SINUMERIK Operate

Forward jump to the marker

The blocks N40 to N90 will be

The program will be continued

as from block N100

Sinumerik 828d