Control Reliability 2
Control Reliability 2 : Control Reliability is required on all safety circuits according to ANSI B.11.10, U.L. 1740 and the draft RIA 1506 standard. The elements of control reliability include: (1) Single fault detection (a) Any single fault will: * be detected * still provide a stop signal * require failure correction (2) It is no simply redundancy (3) Self-checking. Detect single failure and still the device/system can signal a stop
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