F30 01 Appendix
HI 800 145 E Rev. 2.00 Page 47 of 52
Appendix
Glossary
Term Description
ARP
Address resolution protocol: Network protocol for assigning the network addresses to
hardware addresses
AI Analog input
AO Analog output
COM Communication module
CRC Cyclic redundancy check
DI Digital input
DO Digital output
ELOP II Factory Programming tool for HIMatrix systems
EMC Electromagnetic compatibility
EN European norm
ESD Electrostatic discharge
FB Fieldbus
FBD Function block diagrams
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 or ELOP II Factory
PE Protective earth
PELV Protective extra low voltage
PES Programmable electronic system
R Read: The system variable or signal provides value, e.g., to the user program
Rack ID Base plate identification (number)
Interference-free
Supposing that two input circuits are connected to the same source (e.g., a
transmitter). An input circuit is termed interference-free if it does not distort the signals
of the other input circuit.
R/W Read/Write (column title for system variable/signal type)
SELV Safety extra low voltage
SFF Safe failure fraction, portion of faults that can be safely controlled
SIL Safety integrity level (in accordance with IEC 61508)
SILworX Programming tool for HIMatrix systems
SNTP Simple network time protocol (RFC 1769)
SRS 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
r
PP
Peak-to-peak value of a total AC component
Watchdog (WD)
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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