Siemens SIPART PS2 Operating Instructions Manual page 311

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.
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, 05/2017, A5E00074631-AC
Glossary
311