Learning The Neural Network - Siemens SINUMERIK 840D sl Function Manual

Compensations (K3)
5.7 Neural quadrant error compensation
5.7.3

Learning the neural network

Learning process sequence
A certain type of response is impressed upon the neural network during the learning phase.
The relation between the input and output signals is learnt.
The learning process is controlled entirely by NC programs and is divided into the following
areas:
1. Preset the QEC system variables for the learning process
2. Activate QEC system variables (by starting the NC program)
3. Parameterize the learning cycle
4. Start the learning cycle
The result is the learnt compensation characteristic that is stored in the non-volatile user
memory.
The results achieved must be checked using the circularity test (Section "Circularity test").
Reference NC programs
In order to ease the task of the engineer in commissioning the QEC with neural networks,
NC programs containing specimen routines for learning movements and assignments of
QEC system variables (recommended values) are available.
These are the following reference NC programs:
● QECLRNP.SPF
● QECLRNC.SPF
● QECDAT.MPF
● QECSTART.MPF
These NC programs are contained on the diskette of the basic PLC program for the
SINUMERIK 840 D.
Implementing the learning process solely via NC programs has the following advantages:
● Learning can be fully automatic without operator intervention. This is advantageous for
● Learning can take place simultaneously for several axes (up to 4). This significantly
● The traverse movements can easily be adapted to special requirements.
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Learning with POLY standards (Option "POLY" necessary)
Learning with circles
Sample NC program for assigning system variables and the parameters for the learning
cycle
Reference NC program that calls the learning cycle
series commissioning operations if the optimum learning parameters for a machine type
have been found and only the characteristic for each individual machine remains to
determined or retrained.
reduces the learning phase for the machine.
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
Extended Functions