For the purposes of this document, the following symbols and abbreviated terms apply.
CRC |
Cyclic Redundancy Check |
|
PDU |
Protocol Data Unit |
[ISO/IEC 74981] |
PL |
Performance Level |
[ISO 138491] |
PLC |
Programmable Logic Controller |
|
SCL |
Safety Communication Layer |
|
SIL |
safety integrity level |
[IEC 615084] |
SPDU |
Safety PDU, Safety Protocol Data Unit |
|
FSV |
Fail-safe substitute Values |
|
HMI |
Human-machine interface |
|
ID |
Identifier |
|
LSB |
Least significant bit |
|
MNR |
MonitoringNumber |
|
MSB |
Most significant bit |
|
OA |
Operator Acknowledgment |
|
OPC UA PI |
OPC UA Platform Interface |
|
PI |
Platform Interface |
|
PV |
Process Values |
|
SAPI |
Safety Application Program Interface |
|
SFRT |
Safety Function Response Time |
|
SPI |
Safety Parameter Interface |
|
STrailer |
Safety Trailer |
|
TRA |
threat and risk analysis |
|
p |
Bit error probability |
|
Pre,cond |
Conditional residual error probability |
|