Siemens SIPART PS2 Operating Instructions Manual page 283

HART communication
HART devices use the 4 to 20 mA lines for data exchange, and communicate with each
other using the HART protocol. The process enables bidirectional data exchange even in
hazardous environments. With HART communication, digital data from an FSK modem is
modulated to the analog 4 to 20 mA signals. As a result, additional information such as
measuring and/or device data can be transmitted without influencing the analog signals. The
FSK modem required for this is installed in the field device or HART communicator. In the
case of an operator station, the connection is made externally via the serial interface. A
point-to-point connection is used between the field and HMI device. In this case, a HART
HMI device is connected to exactly one HART field device. However, further devices can be
integrated using a multiplexer.
HART communicator
For parameter assignment with the HART Communicator, the connection is made directly to
the 2-wire cable. For parameter assignment with a laptop or a PC, a HART modem is
connected in between.
Increment
From the Latin word incrementare, increase. Increment is the defined amount of change
when increasing a variable gradually. IT term that refers to a step-by-step increase in a
numeric value.→Decrement.
Initialization
Setting the most important basic parameters. Requirement for commissioning the positioner.
IP code
The abbreviation IP stands for International Protection as per DIN. In English-speaking
countries, IP stands for Ingress Protection.
Makrolon
Glass-fiber reinforced polycarbonate (PC).
Microcontroller
Microcontrollers (also µController, µC, MCU) are single-chip computer systems in which
almost all components such as master processor, program memory, working memory and
input/output interfaces are included in a single chip.
NAMUR
Standardization association for measurement and control in chemical industries. NAMUR is
an association of users of process control technology. The members are mainly companies
from German-speaking countries. The association was formed in Leverkusen in 1949.
SIPART PS2 with and without HART
Operating Instructions, 02/2016, A5E00074631-AB
Glossary
283