HB-37350-810-01-50F-EN PSC1-C-10 Installation manual V2.1.docx Page 72 of 189
Version: 50F
On the usage of compact encoders with a dual-channel internal layout, e.g. SSI +
incremental/SinCos, the instructions from the manufacturer in relation to the safety-
related properties of diagnostic measures, mechanical connection and measures for
the supply of power are to be followed. The encoder's safety level must correspond as
a minimum to the safety level required for the overall arrangement. Preferably,
encoders with proven safety-related properties are to be used.
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.
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