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Actual Value Display: Settable Zero Offset System, Szs - Siemens SINUMERIK 840D Operator's Manual

Computerized numerical control system for machine tools.
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4.3 Reference point approach

4.2.12 Actual value display: Settable zero offset system, SZS

Reference point approach
Machine manufacturer
You can make a setting in the MD to define whether
• the position of the workpiece coordinate system, WCS
(= programmed position, corresponds to default setting) or
• the tool holder position of the active tool relative to workpiece zero
(settable zero offset system)
is to be displayed in the actual value display.
For configuring instructions see:
/IAM/IM2, Installation & Start-Up Guide HMI Embedded:
Chapter "Zero Offset"
The "Ref Point" function ensures that the control and machine are
synchronized after power ON.
Before a reference point approach can be carried out, the axes must
be located at positions (if necessary, traversed to these positions
using the axis keys/handwheels) from where the machine reference
point can be approached without collision.
If reference point approach is called from a part program all axes can
be traversed simultaneously.
Reference point approach can only be performed by machine axes.
The actual value display does not match the real position of the axes
when the control is switched on.
• If the axes are not safely positioned, you must traverse them to
safe positions in "Jog" or "MDA" mode.
• You must follow the axis motions directly on the machine!
• Ignore the actual value display until the axes have been
• The software limit switches are not active!
Please refer to the information and specifications provided by the
machine manufacturer.
SINUMERIK 840D/810D Operator's Guide HMI Embedded (BEM) – 03.04 Edition
 Siemens AG, 2004. All rights reserved


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