3.2 Symbols and abbreviated terms

For the purposes of this document, the following symbols and abbreviated terms apply.

3.2.1 Abbreviated terms from IEC 61784-3

CRCCyclic Redundancy Check
PDUProtocol Data Unit[ISO/IEC 7498‑1]
PLPerformance Level[ISO 13849‑1]
PLCProgrammable Logic Controller
SCLSafety Communication Layer
SILsafety integrity level[IEC 61508‑4]
SPDUSafety PDU, Safety Protocol Data Unit

3.2.2 Additional symbols and abbreviated terms

3.2.2.1 Abbreviated terms
FSVFail-safe substitute Values
HMIHuman-machine interface
IDIdentifier
LSBLeast significant bit
MNRMonitoringNumber
MSBMost significant bit
OAOperator Acknowledgment
OPC UA PIOPC UA Platform Interface
PIPlatform Interface
PVProcess Values
SAPISafety Application Program Interface
SFRTSafety Function Response Time
SPISafety Parameter Interface
STrailerSafety Trailer
TRAthreat and risk analysis
3.2.2.2 Symbols
pBit error probability
Pre,condConditional residual error probability