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| BSC | Binary Symmetric Channel | 
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| CRC | Cyclic Redundancy Check | 
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| FSV | Fail-safe substitute Values | 
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| HMI | Human-machine interface | 
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| ID | Identifier | 
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| LSB | Least significant bit | 
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| MNR | MonitoringNumber | 
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| MSB | Most significant bit | 
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| OA | Operator Acknowledgment | 
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| OPC UA PI | OPC UA Platform Interface | 
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| PDU | Protocol Data Unit | [ISO/IEC 74981] | ||
| p | Bit error probability | 
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| PI | Platform Interface | 
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| PL | Performance Level | [ISO 138491] | ||
| PLC | Programmable Logic Controller | 
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| Pre,cond | Conditional residual error probability | 
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| PV | Process Values | 
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| SAPI | Safety Application Program Interface | 
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| SCL | Safety Communication Layer | 
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| SFRT | Safety Function Response Time | 
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| SIL | Safety Integrity Level | [IEC 615084:2010] | ||
| SPDU | Safety PDU, Safety Protocol Data Unit | 
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| SPI | Safety Parameter Interface | 
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| STrailer | Safety Trailer | 
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