Siemens SINUMERIK 840D sl Function Manual page 373

Setting options
The many ways in which the compensation value for sag compensation can be
produced/influenced are listed below (see diagram below).
1. An axis can be defined as the input variable (base axis) for several compensation tables
2. An axis can be defined as the recipient of the output variable (compensation axis) of
3. An axis can be both a base axis and a compensation axis at any one time. The
4. The scope of action of the compensation (starting and end position of the base axis) and
5. Compensation can be direction-dependent (settable via system variables).
6. Every compensation table has a modulo function for cyclic evaluation (settable via
7. A weighting factor by which the table value is multiplied (definable as a setting data which
8. Compensation tables can be multiplied in pairs (settable via system variables).
9. The compensation can be activated in the following ways:
Extended Functions
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
(settable via system variables).
several compensation tables (settable via system variable). The total compensation value
is derived from the sum of the individual compensation values.
The following definitions apply for the maximum number of possible compensation tables:
– Total maximum number of tables available for all axes:
2 * maximum number of axes of system
– Maximum number of tables configured for one particular compensation axis:
1 * maximum number of axes of system
programmed (required) position setpoint is always used to calculate the compensation
values.
the distance between the interpolation points can be defined for every compensation
table (settable via system variables).
system variables).
can therefore be altered by the part program, PLC or the user at any time) can be
introduced for every compensation table.
The product is added to the total compensation value of the compensation axis.
– Machine data:
MD32710 $MA_CEC_ENABLE [AXi] (enable sag compensation)
enables the sum of all compensation relations for machine axis AXi.
– Evaluation of the compensation table [t] is enabled with the following setting data:
SD41300 $SN_CEC_TABLE_ENABLE[t]
(presetting for compensation table)
It is thus possible, for example, to alter the compensation relations either from the part
program or from the PLC user program (e.g. switching over the tables), depending on
the machining requirements.
Compensations (K3)
Interpolatory compensation
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