BBH SMX Series - Page 81

Installation manual
HB-37420-810-01-25F-EN SMX100 Installation manual.docx Page 81 of 260
Version: 25F
4.2.1.3.2 Digital inputs I/O’s (IQIx)
Note:
The achievable PI for a combination of HW-inputs and functional inputs depends on the
chosen operational/organizational tests as well as on the independence of both channels in
the system structure. The determination of the PI requires an application related analysis.
Digital inputs
Achievable
performance level
Comment
IQIx
Without pulse, single channel static signal
-> auxiliary input
PL e
Without pulse, dual channel static signal
- At least one request/day required by
application
- Fault detection only upon request
PL d
Without pulse, dual channel static signal
- Less than one request/day required by
application
PL e
Single-channel with pulse
- Mainly High level required (T
High
> 100 *
T
Low
)
- At least one request/day required by
application
- Fault detection only upon request
PL d
Single-channel with pulse
- Less than one request/day
PL e
Dual channel with pulse1 and pulse2