Scanreco G6 - Safety Functions; Stop Function; Prevention of Unintended Movement from Standstill; Safe Digital Indication

Scanreco – Service Manual G6 Radio Remote Control System
4. Safety Functions
There are four dierent safety classified functions handled by SISP
TM
.
4.1. Stop Function
The Scanreco remote control system shall reach a safe state when the stop button on the
transmitter is pressed or an Automatic/Passive stop occurs.
4.2. Prevention of Unintended Movement From Standstill
The Scanreco remote control system shall remain in standstill when the safety classified analog
actuators of the transmitter are in neutral position and the system is in standstill.
4.3. Safe Digital Indication
The Scanreco remote control system shall indicate the state of the safety classified digital switches.
Safety parameters Value
Safety integrity level SIL 3
Probability of dangerous failure per hour PFHd = 2,2 x 10-8 (= λdu)
Fraction of total failure rate with dangerous and detected consequence λdd = 2,18 x 10-6
Safe failure fraction SFF = 99,5 %
Diagnostic coverage DC = 99 %
Level of hardware fault tolerance HFT = 0
Proof test interval Product lifetime
Diagnostic test interval Continuous
Safety parameters Value
Safety integrity level SIL 3
Probability of dangerous failure per hour PFHd = 4,4 x 10-8 (= λdu)
Fraction of total failure rate with dangerous and detected consequence λdd = 4,36 x 10-6
Safe failure fraction SFF = 99,5 %
Diagnostic coverage DC = 99 %
Level of hardware fault tolerance HFT = 0
Proof test interval Product lifetime
Diagnostic test interval Continuous
Safety parameters Value
Safety integrity level SIL 3
Probability of dangerous failure per hour PFHd = 5,6 x 10-8 (= λdu)
Fraction of total failure rate with dangerous and detected consequence λdd = 5,58 x 10-6
Safe failure fraction SFF = 99,5 %
Diagnostic coverage DC = 99 %
Level of hardware fault tolerance HFT = 0
Proof test interval Product lifetime
Diagnostic test interval Continuous
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