Siemens sinumerik 840D sl Function Manual page 572

Detailed description
2.1 General information
The "analog axis" function can be used to control up to 8 available NC axes via a +/- 10 V
speed interface with an analog drive (e.g.: SIMODRIVE 611A) . The function is designed for
individual motors on a machine that cannot be controlled by digital drive systems such as, for
example, large spindle motors or single motors for tool changers.
Number of analog axes
The maximum number of analog axes depends on the maximum number of NC axes
available.
Axes controlled by analog drives are included in the maximum number of available NC axes
in the system and, when used for this purpose, reduce the number of available digital axes.
NCU2
NCU3s
NCU3
Function
With respect to the scope of applications, analog axes are not subject to any particular
restrictions that do not also apply to digital axes. There is no special dependency on
particular channels, i.e. analog axes can be programmed in different channels. Axes can
also be exchanged between channels. All functions of normal NC axes/spindles such as
those listed below are also available for analog axes:
• Programming from part programs
• Traversal from PLC
• Manual traversal, etc.
Speed setpoint
The speed setpoint of an analog axis is made available on a DMP module on the NCU
terminal block from where it is taken to the analog drive.
Special functions: Analog Axis (TE2)
Function Manual, 11/2006, 6FC5397-2BP10-2BA0
NC axes
12
12
31
Analog axes
3
3
8
2
7