Wirelesshart; Overview - Siemens SITRANS TF280 WirelessHART Operating Instructions Manual

3.7

WirelessHART

3.7.1

Overview

WirelessHART
3.7.2 WirelessHART
Fundamentals
Wireless HART is a fieldbus standard of the HART Communication Foundation and permits
radio-based networking of field devices.
The radio transmission is based on the wireless communication standard
IEEE 802.15.4-2006 (ISM band, 2.4 GHz).
The data transmission is appropriately encrypted using the
Advanced Encryption Standard (AES 128). Data transmission as well as parameterization of
the field devices involved is thus protected.
The data transmission is coordinated by the TDMA procedure
(Time Division Multiplex Access). Signals from different transmitters are then only
transmitted on the common bus within specific time slots, or the radio stations are
synchronized with a sampling rate of 10 ms.
Interferences from other radio stations also using the 2.4 GHz band are minimized by
application of a frequency spread procedure.
SITRANS TF280 WirelessHART
Operating Instructions, 10/2010, A5E02619566-02
Wireless standard
Frequency band
Data transmission
Transmission range
Power supply
Network topologies
HART specification
IEEE 802.15.4-2006 @ 250 kbps
2.4 GHz
Frequency spread procedure (per packet basis)
Up to 250 m (visual connection)
Battery

Meshed network

Star topology

Combination of both topologies

HART protocol V7.1
HART - IEC 61158 E DDL - IEC 61804-3
Description
3.7 WirelessHART
17