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Siemens IK PI · 2015

Industrial Wireless Communication

WirelessHART

General

■

Overview

HART (Highway Addressable Remote Transducer) is the

protocol for bus-addressed field devices. It is not a fieldbus,

but a version of the digital field communication that contains

many of the functionalities of fieldbuses.

WirelessHART is the wireless HART communication to field-

buses in the process industry. The HART Communication

Foundation (HCF) specified WirelessHART and published it as

part of the HART standard V7.1. The radio transmission is based

on the wireless communications standard IEEE 802.15.4.

High availability is achieved by means of the meshed network

architecture (each field device is simultaneously a repeater) with

redundant communication paths and constantly changing

frequency channels (channel hopping). 128-bit encryption in

conjunction with authentication and validation of each data

packet ensures secure data transfer and prevents unauthorized

access to the field devices.

As a basic principle, a WirelessHART network consists of

WirelessHART field devices and a WirelessHART gateway that

receives the data from the field devices and forwards it to the

automation system.

Wireless communication with WirelessHART

Controller without

HART support

Remote I/O station

w/o HART support

SITRANS

MDS

IE/WSN-

PA LINK

SITRANS

AW200

Industrial

Ethernet

Industrial Ethernet

PROFIBUS

Wireless

HART

IEEE 802.11

4–20 mA

G_IK10_XX_30348

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