Switchover Measuring System 1 Or 2 (Sw 2 And Higher); Corresponding Data; Feed Axes - Siemens SINUMERIK 840C Installation Instructions Manual

12 Functional Descriptions

12.15 Switchover measuring system 1 or 2 (SW 2 and higher)

12.15
12.15.1
NC MD 200*
NC MD 220*
Spindle MD 400*
Spindle MD 461*
Axial MD 1288*
NC MD 520*
NC MD 521*
NC MD 564*
NC MD 564*
NC MD 1820*
Signal DB 32 DL k+2 Measuring system 1/2
12.15.2
Two actual value inputs are available for each axis with this function.
To compensate for offsets after switching on the control and before reference point approach,
the function "Second measuring system" can be implemented to activate an absolute encoder
as the first measuring system (indirectly connected) and a linear scale (directly connected) as
the second measuring system. This means that the absolute actual position of the axis is
known directly after switching on (except for the backlash). After this it is possible to switch
over to the second measuring system (e.g. linear scale).
Reference point approach is always executed with the currently selected measuring system.
The first measuring system always serves as the reference system in the control, it determines
the resolution of the position control. Only the actual values of the selected measuring system
are used for the position control.
It is possible to switch to the second measuring system via the axis-specific PLC control signal
(DB 32, DL k+2). It is possible to switch between the two measuring systems at any time,
axes do not have to be at zero speed to do this.
SPC or HMS measuring circuit modules can be used as measuring circuits for the second
measuring system. It is not possible to connect absolute encoders to the second measuring
system. Linear scales with distance coded reference marks can be connected.
Compensation functions:
• A parameterized lead screw error compensation is permenantly assigned to the first
measuring system. The actual values of the second measuring system are not
compensated. While the second measuring system is active, the control ensures that the
lead screw error compensation will take effect when the first measuring system is
activated.
• The quadrant error compensation always uses the actual values of the active measuring
system.
• Compensation values for the backlash can be set for each measuring system separately
(MD 220*/MD 1288*).
• Temperature compensations always effect the actual value of the active measuring
system.
12–116
More user manuals on
Switchover measuring system 1 or 2 (SW 2 and higher)

Corresponding data

1st measuring system connection
Backlash compensation 1st measuring system
Measuring system connection
Assigned C axis
Torque compensatory controller reset time
bit 1 Sign change actual value
bit 1 Sign change setpoint value
bit 1 Sign change setpoint value
bit 2 Sign change actual value
bit 1 Zero monitoring ON
bit 6 Pulse coder monitoring ON

Feed axes

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