KROHNE OPTIWAVE 400 Series Supplementary Instructions Manual page 8

INTRODUCTION
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Systematic Capability
Type A system
Type B system
T[Proof]
T[Repair]
T[Test]
1oo1
1oo1D
1oo2
Table 1-4: Terms and definitions
1 A system with homogeneous redundancy has two devices that operate with the same parameters. A system with het-
erogeneous redundancy has two devices that operate with different parameters.
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Measure (given as a scale of SC 1 to SC 3) of the confidence that the systematic
safety integrity of an element agrees with the conditions of the specified SIL
(related to the safety function of an element), when the element is applied in
accordance with the instructions.
"Non-complex" system (all failure modes are well defined). For more data, refer
to subsection 7.4.4.1.2 of IEC 61508-2.
"Complex" system (all failure modes are not well defined). For more data, refer
to subsection 7.4.4.1.3 of IEC 61508-2.
Proof Test Interval
Time to Repair
Internal Diagnostics Test Interval
1 out of 1 channel architecture (single architecture performs the safety function)
1 out of 1 channel architecture with diagnostics
1 out of 2 channel architecture (architecture with homogenous or heterogenous
redundancy performs the safety function)
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OPTIWAVE X400 / X500
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10/2020 - 4008265401 - AD SIL OPTIWAVE x4-x500 R01a en