Siemens SINUMERIK 840D sl Function Manual page 93

All safety axes are listed in the HMI display "user agreement" for which safe limit positions and/
or safety cams have been activated. The following data are displayed:
● Machine axis name
● SI position
● User agreement
When does a user agreement have to be given?
A user agreement is always required if an axis/spindle is to be monitored for SE, SN.
A user agreement is only required:
● When the axis/spindle is commissioned for the first time.
● When the user intends or needs to again manually and safely reference the axis/spindle.
● If, after power on, the standstill position did not correspond with the actual position and the
control withdrew the user agreement.
● After parking an axis/spindle
(only if the change in position is greater than that defined using MD36944
$MA_SAFE_REFP_POS_TOL tolerance actual value comparison (referencing)).
Note
An axis/spindle must have the status user agreement = yes before the SN and SE functions
can be used.
For axes/spindles without the safety SE and SN functions, the saved stop position position is
not evaluated.
User agreement is not available
If the drive has not been safely referenced and a user agreement has not been given, then
the following applies:
The "Safe software cams" and/or "Safe Cam Track" are active, but are not safety-relevant.
The "Safe software limit switches" are not active
The user agreement can only be set by an authorized user.
The user agreement can be cancelled by the user or as a result of a function being selected
(e.g. new gear stage) - or also an incorrect state (e.g. inconsistency in the user agreement
between the NC and drive). When the user agreement is cancelled, the axis state "axis safely
referenced" is always reset
Safety Integrated
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
Basics regarding the safety functions integrated in the system/drive
WARNING
6.4 Actual value conditioning
93