Networking Basics Reference

Components and Architecture - Networking Basics Reference

The following information provides a basic reference for identifying and applying networking concepts, components, and methods. It is intended primarily as a language bridge between users who have a limited knowledge of networking, but who need to incorporate networking mechanisms in process control systems, and Information Technology (IT) professionals who are adept in network implementation.

Networking topics are many and broad. To be useful, the networking language bridge given here includes topics that apply to HC900 Controllers and to closely related computer and networking devices.

Ethernet

Ethernet is a networking standard (IEEE 802.3) that features:

•Local Area Network (LAN), which means that networked devices are near to each other (usually in the same building)

•"bus" or "star" topology. Bus topology means that all networked devices (also called nodes) connect to a common cable at different locations. Star topology means that a networking device (called a hub or "concentrator") provides interconnections for cables from network nodes.

•Transmission speed of 10 Mbps or 100 Mbps

•CSMA/CD access. CSMA/CD stands for Carrier Sense Multiple Access/Collision Detection. All devices on the LAN are free to transmit at will. If two nodes that are inter-connected at Hubs transmit simultaneously, the collision of the multiple access is detected by the hardware devices associated with the nodes. Each device will wait a random time, and will attempt to re-transmit. If the device detects another collision, it will double wait time before transmitting again. Doubling the wait time is called "exponential back-off".

Node Addressing

Every node on a network has a unique number and or name that is used by transmission protocols to identify it as the Source or the Destination of a message. When it is manufactured, every node is given a hard-coded Media Access Control (MAC) address that can be sensed by other nodes on the network. When it is placed on an Ethernet network, each node is also given an Internet Protocol (IP) address, which is stored in non-volatile memory, and which identifies it uniquely on that network.

Open Systems Interconnection Reference Model (OSI)

The OSI Model provides a reference source of all the methods and protocols needed to connect one computer to another over a network. Although details of networking systems often differ from those specified in the OSI Model, this model is used widely for design and manufacture of networking components as well as networking systems from networks are constructed. The Features of the OSI Model are summarized in Table 3.

Networking Protocols

A network protocol is a set of rules, or syntax, for exchanging data between nodes. In a very simple system, a single protocol is required. For most networking systems used in commercial and industrial applications, several protocols are required. Some protocols operate in one layer of the OSI model, while others operate in more than one layer. For example, Transport Control Protocol/Internet Protocol (TCP/IP) is commonly on the Internet and is used in private networks such as an HC900 Controller LAN. TCP

22	HC900 Hybrid Controller Installation and User Guide	Revision 5
		9/03

HC900 specifications

The Honeywell HC900 is a robust control solution designed to meet the demands of process industries. This flexible and powerful platform provides a comprehensive set of features tailored for process control and monitoring applications. The HC900 is particularly suited for batch control, continuous processes, and discrete applications, making it a versatile choice for a variety of industries, including oil and gas, chemicals, and electricity generation.

One of the main features of the HC900 is its modular design. This allows users to customize their control systems by selecting from a range of I/O modules, communication options, and control strategies. The system supports both analog and digital inputs and outputs, enabling seamless integration with existing infrastructures. Additionally, the modular approach enhances scalability, allowing users to expand their systems as their needs evolve.

The HC900 is equipped with advanced control technologies, including adaptive control, multivariable control, and real-time data logging. These capabilities facilitate fine-tuned control over complex processes, improving efficiency and reducing waste. The system can manage multiple process loops simultaneously, providing operators with a holistic view of their operations.

Another significant characteristic of the HC900 is its intuitive user interface. The system features a graphical display that allows operators to monitor system performance easily and make adjustments quickly. This user-friendly design minimizes training requirements and encourages efficient operation across different experience levels.

Furthermore, the HC900 incorporates sophisticated data management tools. With built-in logging and reporting functions, users can track process variables and generate comprehensive reports for analysis and regulatory compliance. This data-centric approach fosters informed decision-making and enhances overall operational effectiveness.

From a communication standpoint, the HC900 supports a variety of protocols, making it compatible with many industry-standard devices. This interoperability ensures that users can integrate the HC900 into their existing systems without hassle, streamlining migration and upgrade processes.

Additionally, the HC900 is built with reliability in mind. Its rugged design ensures durability, capable of withstanding harsh environments while maintaining consistent performance.

In summary, the Honeywell HC900 stands out as a powerful and flexible control solution, equipped with modular design, advanced control technologies, and user-friendly interfaces that cater to the diverse needs of process industries. With its comprehensive data management capabilities and robust communications options, the HC900 is an excellent choice for organizations striving for efficiency and reliability.

Honeywell HC900 manual Networking Basics Reference

Models: HC900