HB-37420-810-01-25F-EN SMX100 Installation manual.docx Page 80 of 260
Version: 25F
Safety note:
• The manufacturer's data (MTTFD, FIT-numbers, etc.) must be used for a safety related
assessment of the partial system "Sensors".
• The DC-values listed in the table must be used conservatively and compliance with the
boundary conditions (see table under „Remarks“) must be ensured.
• According to the applicable standards, fault exclusions are permitted. The boundary
conditions mentioned in this context must permanently be met.
• If several sensor systems are required for the correct function of a single safety
function, their partial values must be correctly merged by following the chosen method.
4.2.1.3 Classification of digital inputs
4.2.1.3.1 Digital inputs I01 … I14
Achievable
performance level
Suitable for any kind of input elements, with /
without pulse, achievable PI depending on the
MTTFd of the input element, as well as fault
exclusions in the external wiring.
Single-channel with pulse:
- Mainly High level required (T
High
> 100 *
T
Low
)
- At least one request/day required by
application
- Fault detection upon request
Single-channel without pulse:
- Fault exclusion short-circuit between
signals and to VCC
- Fault detection upon request
Dual channel:
- At least one request/day required by
application
- Fault detection upon request
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