Parameterization and configuration
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6.7.3 Access mechanism
The safety-related data channel (F_MessageTrailer) may only be accessed from the safety program;
direct access is not permitted.
Therefore, the registers Safe Control and Safe Status can only be accessed indirectly via
variables. The scope of the variables and how the variables are addressed are control-dependent;
please refer to the system documentation supplied by the manufacturer of the controller.
These variables must be accessed in the following cases:
when the measuring system is re-integrated after communication errors or after the start-up
phase; the variables are displayed via the status LEDs; see enclosed pin assignment
when executing the preset adjustment function
when evaluating, whether the data output are passivated data or cyclic data
if the cyclic data of the safety-related (sub-) module is to be passivated based on certain
states of the safety program
6.7.4 Output of passivated data (substitute values) in case of an error
In the event the safety-related channel is passivated, the safety function requires that, in the cases
listed below, substitute values (0) be used instead of cyclically output values. This status is control-
based reported by a corresponding variable:
when the safety instrumented system is started
in the event of errors in the safety-related communication between controller and measuring
system, via the PROFIsafe protocol
if the Window Increments value set under iParameters has been exceeded and/or the
internally calculated PROFIsafe telegram is faulty
if the ambient temperature, as defined under the corresponding article number, falls below or
exceeds the permissible value range very much
if there are hardware related errors in the measuring system
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