schmersal PSC1 - Page 50

Installation manual
HB-37420-810-01-25F-EN PSC1-C-100 Installation manual - V2.2.docx Page 50 of 201
Version: 25F
4.2.1.3.2 Digital inputs I/O (IQIx)
Note:
The achievable PL for a combination of hardware inputs and functional inputs is dependent on
the operative/organisational tests selected and the independence of the two channels in the
system layout. An application-related analysis is required to determine the PL.
Digital inputs Achievable
Performance Level
Remark
IQIx
Without pulse, single-channel static signal
-> Auxiliary input
PL e
Without pulse, dual-channel static signal
- At least one demand/day due to
application
-
Fault
detection only on demand
PL d
Without pulse, dual-channel static signal
- Less than one demand/day due to
application
PL e
Single-channel with pulses
- Predominantly high level required (T
High
>
100 * T
Low
)
- At least one demand/day due to
application
-
Fault detection only on demand
PL d
Single-channel with pulses
-
Less than one demand/day
PL e Dual-channel with pulse 1 and pulse 2