Programming Via Synchronized Actions; Programming Spindle Controls Via Plc With Fc18 - Siemens SINUMERIK 840D Function Manual

18.7.2

Programming via synchronized actions

Description
M functions M40 to M45 can also be programmed in synchronized actions.
The following must be observed:
● Programming of M40 ... M45 in the part program has no effect on the current status of the
automatic gear step change of synchronized actions, and vice versa.
● When programming S values with M40, automatic gear step change is effective separately
for synchronized actions and the part program.
● M40 is deactivated after POWER ON.
The gear step is not adjusted if an S value is specified from a synchronized action.
● An M40 command programmed using synchronized actions always remains active for
synchronized actions (modal) and is not reset on reset.
● M41 ... M45 selects first to fifth gear steps in accordance with the programming in the part
program.
An axis replacement is necessary in order to run the function.
Once the gear step change has been performed, the spindle status is neutral (same
response to M3, M4, M5 programming).
Further information
For further explanations regarding the programming of the spindle as well as spindle
movements from synchronized actions, refer to:
● Programming Manual Job Planning
● Function Manual Synchronized Actions
18.7.3

Programming spindle controls via PLC with FC18

When the PLC specifies the direction of rotation and speed using FC18, the NC can determine
and select a gear stage to match the speed. This is equivalent to the M40 functionality when
programming via the part program.
The correct start code must be set when FC18 is called in a PLC user program, in order to
activate gear stage selection.
Further information
More detailed explanations regarding the programming of spindle controls by PLC with FC18
can be found in:
● Function Manual PLC
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA
S1: Spindles
18.7 Programming
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