SI-Safety Installation & Operating Manual
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Issue Number: 1
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Index
3
Technical safety features
The internal design of the SI-Safety module comprises two separate channels with two
way cross checking of results. Both channels employ high quality diagnostics for
troubleshooting purposes.
The layout corresponds to Category 4 of EN ISO 13849-1:2006 in terms of architecture
and functional method, i.e. operation.
Figure 3-1 SI-Safety module Layout
The overall architecture is configured as follows: [sensor] [PES]=[Actuator]
Figure 3-2 Overall architecture
The specific Key Technical Safety Indicators can be found on page 18.
For the technical safety evaluation of complete systems, the key technical indicators
identified in this chapter for the PES sub system (Table 3-1 on page 17) can be applied
(e.g. PL e and PFH value in accordance with the verification table defined in EN ISO
13849).
Table 3-1 Key technical safety indicators
Maximum achievable safety class
SIL 3 in accordance with EN 61508
Performance Level e in accordance with EN
ISO 13849-1:2006
System structure
Two channel with diagnosis (1oo2) in
accordance with EN 61508
Architecture category 4 in accordance with
EN ISO 13849
Configuration of operating mode
‘high demand’ in accordance with EN 61508
(high requirement rate)
Probability of a potentially dangerous
failure on an hourly basis (PFH figure)
see
Proof Test Interval (EN 61508)
20 years, then the module needs to be
replaced
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PES
Sensor
PES
Aktuator
Dual scanning of every input and cross-check diagnosis
Actuator
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