schmersal PSC1 Series Installation Manual page 65

Installation manual
In general the following faults in the external encoder system are detected by the PSC1
module:

Short-circuits between the safety-related signal wires

Open circuit in the safety-related signal wires

Stuck at 0 or 1 on one or all safety-related signal wires
Further specific diagnostics for the detection of faults in the external encoder system are
allocated to each encoder type. The related diagnostic measures are listed in the following for
the individual encoder types together with the limiting parameters
Safety instructions:

The diagnostic measures have of course tolerances as a consequence of
measurement inaccuracies. These tolerances are to be taken into account during
the safety-related assessment.

The limits for the related diagnostic measures can be configured to some extent, or
are fixed. The resulting diagnostic coverages are to be assessed for the related
application and included in the overall safety-related assessment.
HB-37350-810-01-38F-DE PSC1-C-10 Installation manual V1.1.docx
Version: 38F
Page 65 of 177