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12.93 12 Functional Descriptions

12.18.14 Special cases of gearbox interpolation

• Distance-coded reference mark system for each gantry axis

To avoid the need to traverse large distances for reference point approach purposes, it is

possible to use a measuring system with distance-coded reference marks as the sole or as the

second measuring system. This measuring system is referenced after a distance of

approximately 2 cm. The referencing procedure is in this case the same as for normal

incremental measuring systems.

Note:

Please refer to functional description of "Distance-coded measuring system" for further details.

Prerequisite

• As for incremental measuring system for gantry axes

• The 1st measuring system (OB 32, DW k + 2 bit 12) must be activated in OB 20 and the

absolute offset (NC MD 1808*bit 3) of the gantry axes in FB 62.

Flowchart for PLC-controlled reference point approach

Activate control

SIPOS measuring systems send their absolute positions to the control

Activate GI grouping 1

Enable following axis overlay

Initiate on-the-fly synchronization for grouping 1

Synchronous position reached? Deactivate grouping 1

Declare absolute offset (NC MD 1808*3) for the leading and following axes to be invalid via

FB 62.

Select 2nd measuring system for leading and following axes (DB32, DWk + 2 bit 12)

Activate grouping 1

Selection reference point mode

Initiate reference point approach with leading axis X1 (following axis X follows X1)

Reference point reached?

Deactivate grouping 1

Activate grouping 2

Initiate reference point approach with leading axis X (following axis X1 follows X)

Reference point reached?

Enable following axis overlay

Initiate on-the-fly synchronization for grouping 2

Synchronization reached? (following axis)

Disable following axis overlay

Select "Automatic" mode

END

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SINUMERIK 840C (IA)

Siemens SINUMERIK 840C Installation Instructions

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