Comparison of SenzaNET with WirelessHART Sample Clauses

Comparison of SenzaNET with WirelessHART. When comparing SenzaNET and the WirelessHART standard, the obvious difference is the decentral- ized design of SenzaNET: In WirelessHART, all networking intelligence is centralized and a so-called NetworkManager determines all routes in the network and also re-organizes the network based on updated information of the RF signal-strength between each node-pair in the network. In SenzaNET, all devices are able to operate independently from a central NetworkManager using local intelligence. The devices can determine locally when the connection to their parent is assumed bad, when to dis- connect from it and when and how to reconnect to a new parent node. Centrally, the server application SenzaWMS is available for user interaction with the wireless sensor network, to authenticate a device in the network, to store data, view status of each node and to send new configuration parameters. The main design motivation of SenzaNET is to provide a network which is simple to use, simple to configure and allows easy integration with a variety of existing automation systems. In contrast to comprehensively standardized protocols like WirelessHART, SenzaNET does not require extensive infrastructure for device management, but offers a set of common interfaces which are supported by a almost all automation systems. For field devices, digital and analog interfacing is offered, whereas on the side of PLC controllers, mostly serial interfacing (RS232), TCP/IP and Profibus are being used. Interfacing to SCADA-systems is achieved through Modbus-TCP. Devices in WirelessHART are supplied with a large set of pre-defined commands for configuration and parametrization and no networking intelligence. Devices in WirelessHART are supposed to listen to commands from the NetworkManager when it somes to setup communication links. This makes the NetworkManager very complex and its operation very tricky. All decisions on network topology and re-formation have to be taken centrally, increasing networking latency, thus limiting network flexibility substantially. Especially in case of relocation of devices, network latency becomes unacceptably high due to the complex network communication required between NetworkManager and all devices involved in re-routing. To summarize, XxxxxXXX compares with the WirelessHART and ZigBee standards as follows:
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