4) SAFETY MANUAL
This section provides necessary information for meeting the IEC 61508 functional safety standards and to design, install, verify and
maintain a Safety Instrumented Function (SIF).
4.1 Responsibilities for Safety
The safety of design and operation of a safety-related system, in which the device is implemented, must be ensured by manufacturer
and operator.
4.1.1 Responsibility of Manufacturer
• Safe design of the device
• Providing of all safety-related information to the operator of the overall system
• Compliance to all regulations and guidelines that allow a safe commissioning
4.1.2 Responsibility of Operator
• Instructing of personnel working on the overall system
• Maintaining the safe operation of the overall system
• Compliance to all regulations and guidelines regarding occupational safety
• Ensuring of periodic test of the overall system by qualified employees
4.2 Terms and Abbreviations
Tab 14. Terms and Abbreviations
FMEDA
Failure Modes, Effects and Diagnostic Analysis
HFT
Hardware Fault Tolerance
PFD
AVG
Average Probability of Failure on Demand
SFF
Safe Failure Fraction
SIL
Safety Integrity Level
Discrete level (one out of a possible four) for specifying the safety integrity require
-
ments of the safety functions to be allocated to the E/E/PE safety-related systems
where Safety Integrity Level 4 has the highest level of safety integrity and Safety
Integrity Level 1 has the lowest.
SIF
Safety Instrumented Function
A set of equipment intended to reduce the risk due to a specific hazard (a safety
loop), Safety instrumented control/protection function
SIS
Safety Instrumented System
Implementation system of one or more Safety Instrumented Functions. A SIS is
composed of any combination of sensor(s), logic solver(s), and final element(s).
DC
Diagnostic Coverage Factor
(if diagnostic measures exist)
PTC
Proof Test Coverage Factor
Names how many dangerous undetected failures can be detected during Proof
Test
PFH
Average Frequency of a dangerous failure per hour
MTBF
(D)
Mean Time between (dangerous) Failures
4.3 Related Standards
Functional safety as IEC 61508 Parts 1,2,4,7:2010 CMV Commented version
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