S-, T-, M- And B Functions; Spindle Function (S Function); Tool Function; Additional Function (M Function) - Siemens SINUMERIK 808D Programming And Operating Manual

Tool radius too large for internal machining
In such cases, a machining of the contour takes place only to the extent possible without damaging the contour.
Tool radius too large for internal machining:
4.3.5

S-, T-, M- and B functions

4.3.5.1

Spindle function (S function)

The spindle speed is specified in rpm in Address S. The direction of spindle rotation is selected with M3 and M4. M3 = right
direction of spindle rotation, M4 = left direction of spindle rotation. The spindle stops with M5. Details are available in the
documentation of your machine manufacturer.
● S commands are modal, i.e., they remain active up to the next S command once they are programmed. The S command
is maintained if the spindle is stopped with M05. If M03 or M04 is programmed thereafter without specifying an S
command, then the spindle starts at the originally programmed speed.
● If the spindle speed is changed, please pay attention to which gear stage is currently set for the spindle. Details are
available in the documentation of your machine manufacturer.
● The lower limit for the S command (S0 or an S command near S0) depends on the drive motor and the drive system of
the spindle and is different from machine to machine. Negative values are not permitted for S! Details are available in the
documentation of your machine manufacturer.
4.3.5.2

Tool function

There are different options of command output for the tool function. Details are available in the documentation of your
machine manufacturer.
4.3.5.3

Additional function (M function)

The M functions initiate switching operations, such as "Coolant ON/OFF" and other functions on the machine. Various M
functions have already been assigned a fixed functionality by the CNC manufacturer (see the following section).
Programming
M... Possible values: 0 to 9999 9999 (maximum INT value), integer
All free M function numbers can be assigned by the machine manufacturer, e.g. for switching functions to control the
clamping devices or for switching on/off of further machine functions. See data of the machine manufacturer.
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