WirelessHART

WirelessHART is a wireless communication protocol designed for the process automation industry. It is an extension of the HART (Highway Addressable Remote Transducer) protocol, which is widely used for sending and receiving digital information between smart devices and control systems in the process industries.

Overview

WirelessHART was introduced in September 2007 by the HART Communication Foundation (now part of the FieldComm Group). It is designed to provide the same benefits as the wired HART protocol, such as interoperability and ease of use, while adding the advantages of wireless communication, including reduced installation costs and increased flexibility.

Technical Specifications

WirelessHART operates in the 2.4 GHz ISM band and uses IEEE 802.15.4 standard radios. It employs frequency hopping spread spectrum (FHSS) and time-division multiple access (TDMA) to ensure reliable and secure communication. The protocol supports mesh networking, allowing devices to relay messages for one another, which enhances network reliability and extends communication range.

Network Components

A typical WirelessHART network consists of the following components:

• Field Devices: These are the sensors and actuators that collect and transmit data.
• Gateways: These devices connect the wireless network to the plant automation system.
• Network Manager: This component is responsible for network configuration, scheduling, and management.
• Security Manager: Ensures the security of the network by managing encryption keys and authentication.

Applications

WirelessHART is used in various applications within the process industries, including:

• Oil and gas industry
• Chemical industry
• Pharmaceutical industry
• Water and wastewater treatment

Advantages

• Cost Savings: Reduces the need for wiring, which can be expensive and time-consuming to install.
• Flexibility: Easier to add or move devices within the network.
• Reliability: Mesh networking and frequency hopping enhance communication reliability.
• Scalability: Can easily scale to accommodate additional devices.

Security

WirelessHART incorporates several security features to protect data integrity and confidentiality, including:

• 128-bit AES encryption
• Message integrity codes
• Device authentication

Related Pages

• HART Communication Protocol
• Fieldbus
• Industrial wireless sensor network
• Process automation

See Also

• FieldComm Group
• ISA100.11a
• Zigbee

External Links

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