Glossary
SITRANS P DS III
70 Service Manual, 06/2014, A5E34219855-01
Final controlling element
Converter that converts electrical signals into mechanical or other non-electric variables.
Firmware (FW) is software that is embedded on a chip in electronic devices – in contrast to
software which is saved on hard disks, 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 is a simple form of modulation, where the digital values 0 and 1
modulate the actual current signal by means of two different frequencies.
Frequency Shift Keying (FSK)
HART (Highway Addressable Remote Transducer) is a standardized, widely used
communications system used to structure industrial fieldbusses. The communications
system provides digital communications for multiple participants (field devices) via a
common databus. HART is based especially on the equally widely used 4/20 mA standard
for the transfer of analog sensor signals. The cabling from existing older systems can be
used directly and both systems operated in parallel.
HART specifies several protocol levels in the OSI model. It facilitates the transfer of process
and diagnostics data and control signals between field devices and high-level control
systems. Standardized parameter sets can be used for the manufacture-independent
operation of all HART devices.
Typical applications include transmitters for measuring mechanical and electrical
dimensions.
Maximum Allowable Working Preassure (PS)
Combination of the probability of damage occurring and the extent of the damage.
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