Siemens sitrans tr200, Руководство по эксплуатации, Страница: 72 / 78

Glossary
SITRANS TR200/TR300
72
Operating Instructions, 04/2007, A5E01071992-01
EC low-voltage directive
The EC low voltage directive applies to electrical resources with rated voltages of:
●
AC from 50 V to 1000 V;
● DC from 75 V to 1500 V.
EEPROM
Electrically Erasable Programmable Read Only Memory
EEPROMs are often used where individual bytes of data (e.g. configuration data or runtime
meters) change over time and must be stored safely in the event of a mains power failure.
EMC
Electromagnetic compatibility
Definition in accordance with EMC law:
EMC is the capability of a device to operate satisfactorily in an electromagnetic environment
without itself emitting electromagnetic signals which interfere with other devices in that
environment.
EN
Europäische Norm - European standard
EU
European Community
Firmware
Firmware (FW) is software which is embedded in a chip in electronic devices – unlike
software that is stored on hard drives, CD ROMs, or other media. These days, firmware is
mostly stored in a flash memory or EEPROM.
Firmware usually contains the elementary functions for controlling the device, as well as
input and output routines.
Frequency shift keying
Frequency shift keying in a simple form of modulation in which the digital values 0 and 1 are
represented by two different frequencies.
Frequency Shift Keying (FSK)
→
Frequency shift keying