Siemens SIMATIC S5 Manual page 148

Machine Data, Modes and Traversing Programs
When G10 and M00 (programmed stop) are programmed in the same block,
M00 has priority. To continue the program, you must press the EXEC key.
The G10 function (flying change) is not permitted when the block to follow in
a flying change
• acts in the opposite direction
• contains a dwell
• contains only an M02
• is too short to reach the required final speed
• contains a change, a tool offset or a zero ofset
• contains a traversing path which is shorter than the preceding block's
deceleration distance
• could not be completely interpreted before the block containing the G10
finished executing
The traversing program interpreter aborts the program immediately when it
detects one of the above errors. Because the interpreter is always three blocks
ahead of the block currently executing, however, the program is aborted in
the current block rather than in the block that actually caused the error.
Example:
A traversing program containing eight positioning operations is to be pro-
cessed. The first seven blocks contain a G10 function, i. e. all blocks are to be
executed without stopping in "flying change" mode.
The eighth block, however, was programmed so that a change of direction
would ensue. The interpreter detects this error and aborts the fifth block, the
block currently executing.
Program:
N10 G10 X50 F100
N20 G10 X80 F200
N30 G10 X130 F300
N40 G10 X155 F400
N50 G10 X200 F500
N60 G10 X240 F600
N70 G10 X280 F700
N80 X0 F800
N90 M02
5-76
<--- Traversing program aborted
<--- Block with error
IP 266
EWA 4NEB 812 6057-02