发表于:2006-03-31 19:31:00
楼主
Introduction
For manufacturers flexible and economic production is the only way of ensuring that products meet the rapidly changing needs of the customer. Distributed automation structures are one of the factors needed for flexible and economic production. The required flow of information is ensured by interconnecting the various areas of the system over local area networks. In the field of industrial communications, networks complying with national and international standards enable the exchange of information at all levels of the automation hierarchy.
PROFIBUS-DP field bus
The PROFIBUS-DP field bus has become established at the field level, where a high-speed response is required and small amounts of data are generally exchanged.
PROFIBUS-DP is an open field bus system and is standardized to the European standard EN 50 170, Volume 2. This field bus system is also the basis for
PROFIBUS-PA, the field bus for process automation.
Features
The PROFIBUS-DP field bus is characterized by the following features:
• Corresponds to the European standard EN 50 170, Volume 2
• Comprehensive range of field bus components
• Data transmission via two-wire or fiber Optic system
• Flexible and modular design of the automation system possible
• Connection to actuator-sensor interface possible
• Reduction in wiring overhead
• Up to 125 nodes can be connected with up to 32 per bus segment
• Short response times thanks to transmission rates of up to 12 Mbit/s
• Coverage of distances up to 23.8 km/ 14.7 miles
• Simple connection of devices through the availability of ASICs and interface modules
• PROFIBUS-DP is the system bus for “Totally Integrated Automation”
• Leading programmable controller vendors recognize PROFIBUS-DP as a standard interface for the field level.
ASICs and interface modules
The interface to the PROFIBUS-DP field bus is open.
The ASICs and interface modules described below provide third-party vendors with a simple and cost effective interface design for connecting their devices and systems to PROFIBUSDP.
Various ASICs and interface modules are available for different functional needs (master function, both simple and intelligent slave stations). ASICs and interface modules are