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Redundant Serial-to-Ethernet Communication in a Power Dispatch Control Center

業種 電力およびユーティリティ
関連製品 CN2610/2650シリーズ
概要 There are 3 main segments in power automation: generation, transmission, and distribution. In most power distribution systems, control centers acquire data from the remote RTU via networks. Each network includes dial-up links from serial modems with the PSTN. Serial-to-Ethernet solutions are required in the power distribution systems of these applications to manage the numerous serial RTUs in the control centers. To enhance system reliability, our client requested the following specifications for their power distribution system.
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Project Background

There are 3 main segments in power automation: generation, transmission, and distribution. In most power distribution systems, control centers acquire data from the remote RTU via networks. Each network includes dial-up links from serial modems with the PSTN. Serial-to-Ethernet solutions are required in the power distribution systems of these applications to manage the numerous serial RTUs in the control centers.


To enhance system reliability, our client requested the following specifications for their power distribution system.


1.Redundant control servers: most power distribution systems are built with two or more control servers.
2.Redundant communication networks: two redundant networks are built to back each other up.
3.Redundant power: mission-critical devices in the system must have built-in dualpower input.


Moxa's Solution

Moxa's CN2600 series terminal server was chosen to meet the above requirements for our client's power distribution system.


When the control server needs to acquire data from the remote RTU, the command is sent in TCP/IP packet format through the Local Area Network (LAN) and received by the CN2600. The CN2600 would then convert the packet into serial messages for the modem to send to the remote modem via PSTN. Finally, the RTU receives the command from the modem and responds to the control server with the data by using the same communication route. Whenever the control server is down, another server is activated to back up the primary server. The LAN and power supply are also backed up in the same way.


Moxa's CN2600 offers high redundancy and the following features for the power distribution system.


1.DRDAS: whenever the control server switch mechanism is activated, the CN2600 can
   automatically identify and cooperate with the backup server.
2.Dual-LAN cards with two independent MAC and IP addresses allow the CN2600 to be
   connected to separate LAN networks. To use this feature, the PC host must also be
   installed with two LAN cards. If one of the networks fails, the PC host will still be able
   to communicate with your serial devices over the redundant LAN.
3.Dual-power input minimizes the risk of data loss in the event of a power failure.


Today, thousands of Moxa's CN2600 series terminal servers have been installed in
power distribution systems all over China.

 

 


 Benefits
1.High redundancy
2.Less software development effort
3.Cost-effective serial-to-Ethernet solution that leverages existing utilities and devices
4.New Redundant COM (patent pending) operation mode (for systems designed with a single control server and dual-LAN) includes a zero "switching time" feature that prevents data transmission between the PC host and serial devices from being interrupted if one of the LANs should fail.

 

Product Implemented

CN2600 Series
• LCD panel for easy IP address configuration
• Dual-LAN cards with two independent MAC addresses and IP addresses
• Redundant COM function available when both LANs are active
• Dual-host redundancy can be used to add a backup PC to your system
• Dual AC power inputs
• Real COM/TTY drivers for Windows and Linux


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