Axis States - Siemens SINUMERIK 840D sl Function Manual

Basics regarding the safety functions integrated in the system/drive
6.4 Actual value conditioning
machine data. Calibration must always be carried out for position-controlled (closed-loop) axes/
spindles.
References: Commissioning Manual, SINUMERIK 840D sl Commissioning CNC: NC, PLC,
drive SINUMERIK 840D sl, "Referencing Axis"
6.4.3

Axis states

"Axis not referenced" state
The axis state "axis not referenced" is reached after the power supply has been powered-up
and the drive and control system have completely booted. This state is indicated using the
axis-specific interface signal "reference point reached" as follows:
Interface signal
"Reference point reached" = "1" axis state "Axis referenced"
"Reference point reached" = "0" axis state "Axis not referenced"
for 840D sl DB31-61, DBX60.4 / DBX60.5
(refer to Fig. "Axis states when referencing")
"Axis referenced" state
For incremental encoders, the position actual value is lost when the NC is switched off. When
the NC is switched on, a reference point approach must be carried out. If the reference point
approach is correctly executed, then the axis is referenced and goes into the "axis referenced"
state.
Contrary to incremental encoders, absolute encoders do not require a reference point
approach after the NC has been switched on. These encoders track the absolute position, e.g.
using a mechanical gear, both when switched on and switched off. The absolute position is
transferred implicitly via a serial interface when the NC is switched on. After the position data
has been transferred and the offset value has been taken into account, the axis also goes in
the axis state "axis referenced".
This axis state "axis referenced" is indicated using the axis-specific interface signal "reference
point reached" as follows:
Interface signal
"Reference point reached" = "1" axis state "Axis referenced"
"Reference point reached" = "0" axis state "Axis not referenced"
for 840D sl DB31-61, DBX60.4 / DBX60.5
90
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
Safety Integrated