Safety Terminology
This table defines safety terms that are used in this manual.
Abbreviation | Full Term | Definition |
|---|---|---|
1oo1 | One Out of One | Identifies the programmable electronic controller architecture. 1oo1 is a single-channel system. |
1oo2 | One Out of Two | Identifies the programmable electronic controller architecture. 1oo2 is a dual-channel system. |
CIP Safety | Common Industrial Protocol - Safety Certified | SIL 3/PLe-rated version of CIP™ . |
DC | Diagnostic Coverage | The ratio of the detected failure rate to the total failure rate. |
PFD | Probability of Failure on Demand | The average probability of a system to fail to perform its design function on demand. |
PFH | Probability of Failure per Hour | The probability of a system to have a dangerous failure occur per hour. |
PL | Performance Level | ISO 13849-1 safety rating. |
SIL | Safety Integrity Level | A relative level of risk-reduction provided by a safety function, or to specify a target level of risk reduction. |
SIL CL | SIL Claim Limit | The maximum safety integrity level (SIL) that can be achieved. |
SNN | Safety Network Number | A unique number that identifies a section of a safety network. |
UNID | Unique Node ID (also called unique node reference) | The unique node reference is a combination of a safety network number (SNN) and the node address of the node. |
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