Appendix CPU 03
Page 34 of 38 HI 800 479 E Rev. 1.00
Appendix
Glossary
Term Description
ARP
Address Resolution Protocol: Network protocol for assigning the network addresses
to hardware addresses
AI Analog Input
COM COMmunication module
CRC Cyclic Redundancy Check
DI Digital Input
DO Digital Output
EMC ElectroMagnetic Compatibility
EN European Norm
ESD ElectroStatic Discharge
FB FieldBus
FBD Function Block Diagrams
FTA Field Termination Assembly
FTT Fault Tolerance Time
ICMP Internet Control Message Protocol: Network protocol for status or error messages
IEC International Electrotechnical Commission
MAC Address Media Access Control address: Hardware address of one network connection
PADT
Programming And Debugging Tool (in accordance with IEC 61131-3),
PC with SILworX
PE Protective Earth
PELV Protective Extra Low Voltage
PES Programmable Electronic System
PFD
Probability of Failure on Demand, probability of failure on demand of a safety
function
PFH Probability of Failure per Hour, probability of a dangerous failure per hour
R Read: The system variable or signal provides value, e.g., to the user program
Rack ID Base plate identification (number)
Non-reactive
Supposing that two input circuits are connected to the same source (e.g., a
transmitter). An input circuit is termed non-reactive if it does not distort the signals
of the other input circuit.
R/W Read/Write (column title for system variable/signal type)
SB System Bus (module)
SELV Safety Extra Low Voltage
SFF Safe Failure Fraction, portion of safely manageable faults
SIL Safety Integrity Level (in accordance with IEC 61508)
SILworX Programming tool for HIMatrix systems
SNTP Simple Network Time Protocol (RFC 1769)
S.R.S System.Rack.Slot addressing of a module
SW Software
TMO TiMeOut
W Write: System variable/signal is provided with value, e.g., from the user program
WD
WatchDog: Time monitoring for modules or programs. If the watchdog time is
exceeded, the module or program enters the ERROR STOP state.
WDT Watchdog Time
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