Siemens SINUMERIK 840C Installation Instructions Manual page 980

04.96 12 Functional Descriptions
12.19.5 Interpolation and compensation with tables
If the output is assigned to the compensation value of an axis (446), the output value is limited
only by the compensation limitation module (9). The limitation values are then specified in the
machine data. When the limitation values are reached, this is indicated by the axis-specific
interface signals.
If an IKA configuration is used as curve gear interpolation (CGI) within a gear interpolation
grouping there are restrictions that can be seen from the upper part of the diagram.
The input selection module has been reduced to the option of an axis actual-value or axis
setpoint coupling. Input quantity B no longer has any influence on the magnitude of the output
value because the output quantity weighting is only performed via the numerator (Z) and the
denominator (N) of the gear coupling factor. In a normal IKA configuration, the output value
refers to the position control resolution of the output quantity, in CGI, conversion to the
position control resolution of the input quantity A (leading axis, leading spindle) is performed.
The weighting factor of input A, which has no effect with CGI, also has an effect and must
therefore always be set to 1.
The output selection module is no longer required because the output value is always assigned
to the setpoint of an axis or spindle.
After output weighting, all coupling branches to the setpoint of the following axis/following
spindle are brought together.
The following quantity is limited via the machine data of the gearbox interpolation with respect
to position, velocity and acceleration of the following quantity.
Feedrate override, feedrate stop and feedrate disable do not affect
following axes in the case of IKA links.
If IKA parameters change, the following axes move.
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SINUMERIK 840C (IA)
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