Siemens SINUMERIK 840D sl Function Manual page 269

System variables
The position-related compensations as well as additional table parameters should be saved
in the form of system variables for each machine axis as well as for each measuring system
(if a 2nd measuring system is being used):
● $AA_ENC_COMP_MIN[<e>,<AXi>] (initial position)
The initial position is the axis position at which the compensation table for the relevant axis
begins (≙ interpolation point 0).
The compensation value for the initial position is $AA_ENC_COMP[<e>,0,<AXi>)].
The compensation value of interpolation point 0 is used for all positions smaller than the
initial position (does not apply for tables with modulo function).
● $AA_ENC_COMP_MAX[<e>,<AXi>] (end position)
The end position is the axis position at which the compensation table for the relevant axis
ends (≙ interpolation point <k>).
The compensation value for the end position is $AA_ENC_COMP[<e>,<k>,<AXi>)].
The compensation value of interpolation point <k> is used for all positions larger than the
end position (exception for table with modulo function).
The following supplementary conditions apply to interpolation point <k>:
– for k = MD38000 - 1:
– for k < MD38000 - 1:
– for k > MD38000 - 1:
● $AA_ENC_COMP_STEP[<e>,<AXi>] (distance between interpolation points)
The distance between interpolation points defines the distance between the compensation
values in the relevant compensation table.
Extended Functions
Function Manual, 10/2015, 6FC5397-1BP40-5BA3
The compensation table is fully utilized!
The compensation table is not fully utilized. Compensation values entered in the table
that are greater than k are ignored.
The compensation table is limited by a control function which reduces the end position.
Compensation values that are greater than k are ignored.
K3: Compensations
5.4 Interpolatory compensation
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