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| 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. |
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 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.
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| 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. |
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| Ethernet-based Remote Monitoring Network for Urban Metro |
The Shanghai Metro is an urban mass rapid transit system that incorporates both subways and elevated light railways. Due to rapid population growth in Shanghai city, daily ridership jumped to a new record of 3.82 million passengers in April of 2008. This surge in ridership made it necessary to introduce a more efficient and real-time security monitoring system to maintain public security and safety. For this reason, the Shanghai Metro decided to upgrade its current monitoring network in response to these needs. An Ethernet network with synchronized Ethernet I/O solutions was adopted to provide an efficient multi-point monitoring system in one network.
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| The monitoring and control system includes three levels: central information level, station level, and field level. The system also covers an extensive system at subway tunnels, elevated tracks, as well as all kinds of control rooms for controlling signals, environmental factors, and power. Moxa's ioLogik E2212 Active Ethernet I/O devices were selected to integrate the local I/O status with the network, and duplicate signals to local and remote control centers over the Ethernet network formed by the EDS-726 Gigabit modular Ethernet switches. The local intelligence of the ioLogik E2212 delivers event messages automatically, making more network bandwidth available for video transmissions over the network, which is essential for establishing one network for efficient and effective monitoring. |
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| Intrusion Detection with SNMP and IP Video |
| Wars and oils are the hottest issues in the Middle East. And the oil storage tanks are usually the target of attack during wartime. Typically, oil storage tanks and refining equipment are the most important parts in an oil refinery. Protecting these facilities from being damaged is a top priority of oil companies. One of our customers in Europe planned to combine video and alarm signals in one fiber network. In addition to video surveillance, digital I/O devices in the field were used for remote monitoring and alarms. However, the IP surveillance system is a bandwidth killer. Assuring that alarm messages can be delivered with precise time stamps is key. The client used SNMP to monitor their network devices and wanted to integrate this new intrusion detection system with their remote monitoring system. SNMP, fiber network and low bandwidth consumption are the prerequisites for the new system. |
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| To implement a reliable network backbone that can support 200 IP video feeds, the customer used the EDS-510A managed Ethernet switch to build a redundant Gigabit Ethernet network. However, the EDS-510A's two digital input channels are insufficient for extra monitoring devices, and the ioLogik E2210 Active Ethernet I/O server provided the necessary digital I/O channels. The built-in SNMP support and multiple I/O channels of ioLogik E2210 were available for control and monitoring by SNMP, no additional management software was required. In addition, status changes of each I/O channel could be actively reported by SNMP trap, so there is no need for data polling.
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©2008 Moxa Inc. All rights reserved. |
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