Siemens SINUMERIK 840D sl Function Manual page 370

K3: Compensation
5.4 Interpolatory compensation
● $AN_CEC_MAX[<t>] (end position)
● $AN_CEC_DIRECTION[<t>] (direction-dependent compensation)
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The end position is the base axis position at which the compensation table [<t>] ends (≙
interpolation point <k>).
The compensation value for the end position is $AN_CEC [<t>,<k>].
The compensation value of interpolation point <k> is used for all positions larger than the
end position (exception: table with modulo functions).
The following supplementary conditions apply to interpolation point k:
– for k = MD18342 - 1:
The compensation table is fully utilized!
– for k < MD18342 - 1:
The compensation table is not fully utilized. The compensation values entered that are
greater than k are ignored.
– for k > MD18342 – 1:
The compensation table is limited by a control function which reduces the end
position. Compensation values that are greater than k are ignored.
This system variable can be used to define whether the compensation table [<t>] should
apply to both traversing directions of the base axis or only either the positive or negative
direction:
– $AN_CEC_DIRECTION[<t>] = 0:
Table applies to both directions of travel of the base axis
– $AN_CEC_DIRECTION[<t>] = 1:
Table applies only to the positive traversing direction of the base axis
– $AN_CEC_DIRECTION[<t>] = -1:
Table applies only to the negative traversing direction of the base axis
Possible applications:
Position-dependent backlash compensation can be implemented using two tables, one of
which affects the positive traversing direction, the other of which affects the negative
traversing direction of the same axis.
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
Extended Functions