Wireless Hart

Wireless HartTeams members:inh Thi Hin 41101154Thch Minh Dng 41100641Nguyn Trung Qun 41102770

4 May 20151 INTRODUCTIONS NETWORK ARCHITICTURE LAYERS SPECIFICATIONS Physical Layer Data-Link Layer Network Layer Transport Layer Application LayerSUPERFRAME

4 May 20152Wireless HART is a Wireless Mesh Network Communications Protocol.Existing HART applications (control systems, PLC's, maintenance tools, and asset management applications, e.g...)

Introductions

4 May 20153

Network Architecture4 May 20154Wireless HART Field Devices (WFD):* The most common type of network device* Sensor/Actuator/Both* Connected to the process or plant equipment* Combines wireless communications With traditional HART communication Field Device capabilities

Handheld: Host application residing on a portable device. Its aim is the configuration, monitoring, calibrating and maintenance of devices. It can be connected to the Wireless HART network or the plant automation network.Network Architecture4 May 201555Gateway:(GW) Divided into virtual Gateway and the Access Points (AP) (1 or more). It is the link between the host applications, Network manager and the wireless HART network. Responsible of buffering, protocol conversions and clock source. One gateway can support up to 80 devicesNetwork Architecture4 May 20156Adapters: They are the devices providing backwards compatibility by adding wireless HART capabilities to wired HART devices. It can provide wireless access to one or more devices.Routers :Devices capable of routing and forwarding packets in the network.However, they are not connected to the industrial process (sensors or actuators).They are required when wireless connectivity needs to be improvedNetwork Architecture4 May 20157Network manager:Responsible for configuration of the network Scheduling communication between Wireless HART devices (e.g., configuring super frames)Management of the routing tables Monitoring and reporting the health of the Wireless HART Network

Network Architecture4 May 20158

Network Architecture4 May 20159

Layers Specifications4 May 201510Physical Layer:Maximum data rate (250 kbps)Operating Frequency (2.4 - 2.48 GHz)Transmit Power is 10dBm (Nominal) adjustable in discrete steps (e.g., 0dBM and others)

Layers Specifications4 May 201511Data-Link Layer:Has long and short addressesAdditional Wireless HART DLPDU specifies a byte which identifies Wireless HART packet typesBus Arbitration with TDMA using timeslots organized into super frames as 100 timeslots per second Acknowledgement packets include timing information to continuously synchronize TDMA operation across entire network

Layers Specifications

4 May 201512TDMA: time division multi access12Network Layer:Upstream and downstream graph routing Provides redundant path routing for maximum reliability and managed latency Supports Broadcast, multi-cast and uni-cast transmissions

Layers Specifications

4 May 201513Transport Layer:Provides un-acknowledged and end-end acknowledgement of communications.Acknowledged transmissions include automatic retries to confirm successful data transfer.Also supports TCP-like reliable block transfers of large data sets.

Layers Specifications

4 May 201514Application layer:It defines various device commands, responses, data types and status reporting. In WirelessHART, the communication between the devices and gateway is based on commands and responses. The application layer is responsible for parsing the message content, extracting the command number, executing the specified command, and generating responses.

Layers Specifications

4 May 201515

Superframe4 May 201516

Superframe4 May 201517All devices must support multiple superframesAt least one Superframe is always enabled while additional superframes can be enabled or disabledSlot sizes and the superframe length are fixed and form a network cycle with a fixed repetition rate SuperframeSlot=(Absolute Slot Number)%Superframe.NumSlotsSuperframe4 May 201518THANK FOR YOUR LISTEN4 May 201519