Siemens SINUMERIK 840D sl Function Manual page 101

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05.08
"Axis referenced" state
For incremental encoders, the position actual value is lost when the NC is pow-
ered–down. When the NC is powered–up, a reference point approach must be car-
ried out. If this is executed correctly, then the axis is referenced and goes into the
"axis referenced" state (refer to 5-5 "Axis states when referencing").
Contrary to incremental encoders, absolute encoders do not require a reference
point approach after the NC has been powered–up. These encoders track the ab-
solute position, e.g. using a mechanical gear, both when powered–up and pow-
ered–down. The absolute position is transferred implicitly via a serial interface
when the NC is powered–up. 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" (refer to Fig. 5-5 "Axis states when referencing").
This axis state "axis referenced" is indicated using the axis–specific interface signal
"reference point reached" as follows:
Interface signal
"Reference point reached" = "1"
"Reference point reached" = "0"
for 840D sl
References:
"Axis safely referenced" state
In order to reach the axis state "axis safely referenced", the axis state "axis refer-
enced" must have been reached, and either
S the user confirms the current position using the user agreement (refer to Chap-
ter 5.4.4 "User agreement"
or
S a saved and set user agreement and saved stop position when the system was
powered–down must exist. The position associated with the saved data must
match the current position within a tolerance window. This is checked both in
the drive and in the NC.
(refer to Fig. 5-5 "Axis states when referencing").
The axis state "axis safely referenced" is displayed using the SGA "axis safely
referenced". A safety–related position evaluation can only be carried out for the SE
and SN functions after this state has been reached.
Saved user agreement
The state of the user agreement function is saved in non–volatile memories. This
saved user agreement forms, together with the stop position, also saved in a non–
volatile fashion the prerequisite for the axis state "axis safely referenced".
© Siemens AG 2008 All Rights Reserved
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 05.2008 Edition
Basics on the Safety Functions Integrated in the System/Drive
Axis state "Axis referenced"
Axis state "Axis not referenced"
DB31–61, DBX60.4/DBX60.5
/IAD/, Commissioning Manual, SINUMERIK 840D sl
5.4 Actual value conditioning
5-101

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