Error Messages From The Nc To The Plc; Dynamic Feedforward Control And Setpoint Smoothing Filter - Siemens SINUMERIK 840C Installation Instructions Manual

10.94
12.13.10
Indexing from the PLC is via the command channel. If disturbances occur while this function is
being executed, an error message is sent to the user interface.
The error messages are divided into general and function-specific command channel errors.
12.14
A P feedforward control (MD 312* and MD 465*) and a D feedforward control (MD 1124*/
MD 2449*) with a symmetrizing element to prevent overshoots (MD 392* and
MD 467*) are implemented in the position controller. In addition, a smoothing filter in the
setpoint path can be activated (MD 1272* with option bit MD 1820*, bit 0/MD 486*) to level out
dynamic differences between interpolating axes. (See figure for structure of feedforward
control). Please note the additional calculation time required for this function.
Position
setpoint
Note:
The parameters for the 1st parameter set are shown in the diagram above. A total of 8 pa-
rameter sets are available. Refer to "Parameter set switchover" function for further details.
© Siemens AG 1992 All Rights Reserved
SINUMERIK 840C (IA)
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Error messages from the NC to the PLC

Dynamic feedforward control and setpoint smoothing filter

d
dt
MD 392* or 467*
MD 1272*/486*
Symmetrizing filter
Setpoint filter
ManualsBase.com
12.13.10 Error messages from the NC to the PLC
D feedforward control factor
MD 1124*/MD 2449*
d
dt
MD 312* or MD 465*
d
dt
Feedforward control factor
-
MD 252* or MD 435* ff.
Servo gain factor
Position
actual value
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12 Functional Descriptions
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