Migrate from Passive to Active
By emphasizing "local intelligence" and "configuration simplicity," Moxa's Active Ethernet I/O solutions provide remote monitoring and alarm applications with a number of important benefits. Compared with traditional I/O control, which is restricted to unintelligent I/O devices connected over the network to high-end host computers running complex control code, Active Ethernet I/O takes a huge load off your network. This is because traditional I/O control uses intensive polling of field sites that not only delays access to important event messages and data acquisition signals, but also clogs up the network with tons and tons of polling messages. Setting up efficient event response and synchronous communication are the major challenges of planning this kind of system. In response to these needs, the new generation Active Ethernet I/O offers remote monitoring and alarm applications an optimal solution in the form of automatic condition-based reporting and the ability to connect to a variety of communications media.
Small RTU Concept in Smart Grid for Broadband over Power Lines (BPL)
Broadband Internet access is already being enjoyed in densely populated areas and developed regions, but since some rural and less developed areas still do not have broadband service, a few companies have investigated how to provide reliable and cost effective broadband service to these areas. One of the key issues was determining the best technology to use for the last mile of the connection. Since the deployment and use of wired systems in remote areas is usually not feasible due to the high cost, wireless is the best candidate. The solution combines the power distribution grid with Wi-Fi technology to create reliable, high-capacity, and cost effective network access. The main advantage of BPL technology is that the last mile of access is achieved using the power grid, eliminating the need to create an additional infrastructure.
Providing broadband access to end-users through the electric power grid is achieved through a Wi-Fi network. With Wi-Fi technology, LV (low voltage) power lines are not needed. Data packets travel along the power line in the 1 to 34 MHz frequency range together with the electric current, which is transmitted at 50 or 60 Hz. Users can then use Wi-Fi to connect to the BPL communication grid. The BPL network has been installed on two MV (Medium Voltage) lines with a total length of 70 km. The network includes 110 BPL units that are used for monitoring. Moxa's ioLogik E2210 Active Ethernet I/O has been installed in each BPL unit. The system diagram illustrates how the Moxa ioLogik monitors the status of Wi-Fi communication. When communication is lost, the Wi-Fi access point is restarted automatically by the ioLogik. The ioLogik sends out a pulse output to trigger the indicator light on the tower, making it possible to monitor all I/O signals from a central site with SNMP. In addition, users can control the irrigation pumps remotely with SNMP protocol.
For more detail, please go to
http://www.moxa.com/Zones/Active_Ethernet_IO/ClicknGo/Index.htm
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