Siemens SINUMERIK 840D sl Function Manual page 369

with: <t> =
The required number of compensation interpolation points is calculated as follows:
Table parameters
The position-related compensation values as well as additional table parameters should be
saved for every compensation relationship in the form of system variables:
● $AN_CEC[<t>,<N>] (compensation value for interpolation point <N> of compensation
● $AN_CEC_INPUT_AXIS[<t>] (basic axis)
● $AN_CEC_OUTPUT_AXIS[<t>] (compensation axis)
● $AN_CEC_STEP[<t>] (interpolation point distance)
● $AN_CEC_MIN[<t>] (initial position)
Extended Functions
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
Index of the compensation table
Permissible range:
table [<t>])
<N> = interpolation point (position of the basic axis)
The particular compensation value of the compensation axis must be entered in the table
for each individual interpolation point.
<N> is limited by the maximum number of interpolation points in the relevant
compensation table (MD18342 $MN_MM_CEC_MAX_POINTS):
0 ≤ N ≤ MD18342 - 1
Name of machine axis whose setpoint is to be used as the input for the compensation
table [<t>].
Name of machine axis to which the output of the compensation table [<t>] is applied.
Note
In multi-channel systems the "general axis identifiers" AX1 ... must be defined, if the
identifiers of machine axis and channel axis are identical.
The interpolation point distance defines the distance between the input values for the
compensation table [<t>].
The initial position is the base axis position at which the compensation table [<t>] begins
(≙ interpolation point 0).
The compensation value for the initial position is $AN_CEC [<t>,0].
The compensation value of interpolation point 0 is used for all positions smaller than the
initial position (exception: table with modulo functions).
5.4 Interpolatory compensation
0 ≤ t < 2 * maximum number of axes
t = 0: 1st compensation table
t = 1: 2nd compensation table
...
K3: Compensation
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