18
SI-Safety Installation & Operating Manual
Issue Number: 1
•
The specific key technical safety indicators for this module can be found in Chapter
3, Key technical safety indicators (Table 3-1).
•
When using several sensors with different functions (e.g. position indicator, access
door + speed recording) for a safety function (e.g. safe reduced speed with access
door open), these must be included as an inline circuit in any technical safety
assessment of the complete system.
•
Due compliance with safety specifications and EMC directives is mandatory.
•
With regard to the fault exclusions made, reference is made to the Tables listed
under D in the Annex to EN ISO 13849-2.
•
For the technical safety evaluation of complete systems, the key technical indicators
identified in Chapter 3 for the PES sub system (Table 3-1) can be applied (e.g. PL e
and PFH value in accordance with the verification table defined in EN ISO 13849)
The examples shown below and their characteristic architecture, are largely responsible
for assignment to a category as defined in EN ISO 13849-1:2006.
The resultant maximum possible Performance Levels defined in EN ISO 13849 remain
dependent on the following factors for external components:
•
Structure (simple or redundant)
•
Detection of faults with a common cause (CCF)
•
Diagnosis coverage level on request (DCavg)
•
Time until dangerous failure of a channel (MTTFd)
3.1
Key indicators for technical safety and circuitry for
connected sensors
The SI-Safety module has completely separate signal processing paths for each safety
input. Furthermore, design measures enable the highest possible DC levels to be
reached.
3.1.1
Digital sensors and command devices:
Two channel signal processing and diagnosis through cross checking in the PES.
Figure 3-3 Grouped inputs
Dual scanning and signal processing in two channels, diagnosis through cross checking
in the PES.
Safety instructions
WARNING
Actuator
PES
Sensor
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