Executing Machining Programs; Automatic (Mode 8) - Siemens SIMATIC S5 Manual

4.3

Executing Machining Programs

4.3.1

Automatic (Mode 8)

A series of traversing movements, dwell times and loops can be stored on the module as a ma-
chining program. The structure and effects of machining programs or of functions in machining
programs is discussed in Section 2.6 "Machining Programs and their Structure". To execute a
machining program, you must specify the parameter "program number" in the operating instruc-
tion. The machining program is executed with the "start" command. You can interrupt the pro-
gram at any time with the "stop" command. The distance to go then remains unchanged until the
next traversing movement, You can start again from the first statement, (start command) or from
the point at which the program was interrupted (enter command). The program is terminated by
a further stop command or by starting a different mode. For the automatic mode, the reference
point must be set. While a machining program is being executed you can not change or delete
this program.
Machining programs stored on the module are not assigned to a particular axis. They can be
used by both axes simultaneously, If the machine data or your plant contradict the requirements
of the machining program, the IP247 recognizes the error while executing the machining pro-
gram. The machining program is then terminated for the corresponding axis and an error mes-
sage is displayed.
On the module, a machining program interpreter evaluates the individual statements of the ma-
chining program. This interpreter is normally several statements ahead of the statement currently
being executed. This means that an error such as "flying change could not be executed" may be
signalled before the illegal statement in the machining program has been executed.
Zero offsets can be programmed in machining programs, which are then automatically cancelled
again after the program is completed. If the program is aborted before it is completed, these off-
sets are not automatically cleared, They must be eliminated with BA14 "clear zero offset" (=>
Section 4.3,7 "Clear Zero Offset").
Tool length offsets activated in the automatic mode are retained after the machining program is
completed or aborted.
If a machining program is executed on a rotary axis, the approach to the target by the shortest
route is the default. Since the IP247 calculates the shortest route itself and therefore determines
the direction, you must make sure when programming a flying change that the flying change is
permitted and does not lead to an error.
Executing Machining Programs
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