Installation manual
HB-37420-810-01-25F-EN PSC1-C-100 Installation manual - V2.2.docx Page 44 of 201
Version: 25F
4.2 Safety-related characteristic data and circuitry for sensors connected
The PSC1 modules have completely redundant signal processing paths for each safety input.
In addition, measures for obtaining the highest possible DC values are implemented.
4.2.1 Digital sensors
The digital inputs are completely redundant. The details for the categorisation, the DC and the
achievable PL or SIL are listed in the following.
4.2.1.1 Characteristics of the sensors / input elements
Dual-channel input element in parallel circuit (cat. 4, fault tolerance 1) with high DC due to signal processing in two
channels and diagnostics using cross comparison in the PES
Dual-channel input element in series circuit (cat. 4, fault tolerance 1) with low to medium DC due to signal
processing in two channels and diagnostics using cyclic testing
Single-channel input element and dual-channel processing with low to medium DC due to signal processing in two
channels and diagnostics using cyclic testing, PL / SIL dependent on fault exclusions allowed and test rate for the
input element.
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