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Siemens UL 489 Connection to the BDA Plus via the Ethernet Interface, Definition of Key Terms

Models: UL 489 UL1066

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Breaker Data Adapter (BDA)

WL Circuit Breaker

Connection to the BDA Plus via the Ethernet Interface

In addition to communication via the serial RS232 channel, the BDA Plus features an Ethernet interface. If the BDA Plus is to be addressed via this interface, it must be integrated in the local Ethernet (LAN). This chapter explains a number of key terms and settings.

Ethernet

Unlike the MODBUS, Ethernet does not function according to a master- slave principle. All the stations have equal priority on the bus, which means that any station can be

the sender and/or receiver.

A sender can only send on the bus if no other station is sending at that point. This is due to the fact that the stations are always "listening in" to find out whether any messages are being sent to them or any

senders are currently active.

If a sender has started sending, it checks that the message it has sent is not corrupt. If the message is not corrupt, the send operation continues. If the sender detects that its data is corrupt, it must abort the send operation because a different sender has already started sending data.

After a random time has elapsed, the sender restarts the send operation. This is known as CSMA/CD and, because it is a “random” access procedure, does not guarantee a response within a certain time frame. This largely depends on the bus load, which means that real-time applications cannot yet be implemented with Ethernet.

Definition of Key Terms

An Intranet system is comprised of several Ethernet lines connected to each other via gateways within a company. The structure of an Intranet system can be just as

diverse as that of the Internet:

it can be restricted to one location or distributed worldwide.

Ethernet/Intranet lines are connected to each other using repeaters, bridges/switches, routers and gateways. These modules work at different levels in the ISO/OSI 7-layer model.

The repeater (or star coupler) only regenerates and strengthens the electrical signal; it does not interpret bits. The bridge (or switch) physically separates the networks and performs fault and load disconnection. Filtering and guidance mechanisms are usually implemented. The router decouples the networks at the logical level (protocol level) by means of the specified addresses. Using routing tables, it knows which messages are to be sent to which address. It continues to work, however, on a protocol-dependent basis. The gateway also enables the router to convert services.

This means that it can act as a security mechanism, such as a firewall, while functioning as a proxy.

A proxy is a program in a gateway that acts as both the server and client. It processes requests, translates them if necessary, and forwards them to the addressees. Proxies are also used to control access (firewall) and forward requests for protocols that are not supported. Intranet users in particular are familiar with the Internet/Intranet page caching function offered by proxies.

The Intranet is connected to the Internet via a company proxy, which can also act as a firewall. If a PC (user) wants to access an area of the Intranet from the Internet, the firewall must be informed of which addresses can be accessed from outside.

Graphic 4-5This diagram illustrates the structure of an Ethernet, how an intranet is integrated, and how this is connected to the Internet.

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WL MODBUS Communication and Electronic Accessories • January 2005

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Siemens UL 489, UL1066 specifications Connection to the BDA Plus via the Ethernet Interface, Definition of Key Terms
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UL 489, UL1066 specifications

Siemens UL1066 and UL489 are essential components in the landscape of electrical equipment, specifically in circuit protection and control. These standards ensure reliability, safety, and efficiency in various applications, including industrial, commercial, and residential settings.

The Siemens UL1066 is primarily focused on disconnect switches. These devices are designed to isolate electrical circuits, ensuring the safety of both personnel and equipment during maintenance or in case of faults. One of the key features of UL1066 disconnect switches is their high breaking capacity, enabling them to handle significant fault currents without failure. This characteristic is crucial in protecting downstream equipment from damage caused by short circuits. The UL1066 switches are also known for their robust construction, often featuring a metal enclosure that enhances durability and environmental resistance. Additionally, these switches can be operated manually or remotely, offering flexibility in operation and control.

On the other hand, Siemens UL489 circuit breakers provide comprehensive protection against overcurrents and short circuits. These devices not only interrupt fault currents but also protect connected devices from damage due to overload situations. Key features of UL489 circuit breakers include adjustable trip settings, which allow users to customize the response to overcurrent conditions based on specific application requirements. This adaptability makes them suitable for a wide range of environments, from large industrial plants to smaller commercial buildings.

Both UL1066 and UL489 products are constructed with advanced technologies, such as thermal-magnetic or electronic trip mechanisms in UL489 devices, ensuring precise and timely interruption of fault currents. These technologies promote energy efficiency and stability within electrical systems. In addition, many of these devices are equipped with indication features, providing clear visual status cues for quick assessment in emergency situations.

In terms of characteristics, both UL1066 and UL489 devices adhere to rigorous testing and certification processes to meet UL standards. This compliance assures users of their performance and reliability. Furthermore, the devices are designed to accommodate a wide range of operating temperatures and environmental conditions, making them versatile choices for various applications.

In summary, Siemens UL1066 and UL489 devices are paramount in ensuring safety and efficiency in electrical circuits. Their advanced features and robust construction make them indispensable in protecting both personnel and equipment in an array of industrial and commercial applications.