Siemens SINUMERIK 840D Description Of Functions page 172

3 Safety-Related Functions
3.11 Encoder mounting arrangements
If the user agreement has been set without the axis being in the "axis
referenced" state, then Alarm "Defect in a monitoring channel" is output with
error code 1004.
The user agreement can only be set by an authorized user.
The user agreement can be cancelled by the user or as the result of a function
selection (e.g. new gear stage) or an erroneous status (e.g. an inconsistency in
user agreement between NC and drive). When the user agreement is
cancelled, the axis state "axis safely referenced" is always reset (refer to
Fig. 3-36, "Axis states during referencing").
Saved user agreement The status of the user agreement function is saved in non-volatile memories.
This agreement data constitutes the previous history in combination with the
standstill position data that is also saved in a non-volatile fashion.
Saved standstill The saved standstill position data is combined with the permanently saved user
position agreement to form the previous history.
The following must be noted when the standstill position is saved:
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SINUMERIK 840D/SIMODRIVE 611 digital SINUMERIK Safety Integrated (FBSI) - Edition 11.03
The standstill position is saved when a safe operating stop (SBH) is
selected via the SGE "SBH/SG de-selection".
The following applies when SE/SN is active:
The standstill position is also cyclically saved.
If the axis is moved with the system powered-down, then the saved
standstill position no longer matches the current position.
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11.03