Protocol conversion device based on PROFIBUS-DP master station field bus

Abstract

The invention discloses a protocol conversion device based on a PROFIBUS-DP master station field bus, which is characterized by comprising a C101-PFB module, a C101-CPU (Central Processing Unit) module and a C101-DB module. The C101-PFB module, the C101-CPU module and the C101-DB module exchange data through a 256k-byte high-speed shared memory; and the C101-PFB module is in networking interconnection with each PROFIBUS-DP substation through an RS485 serial electric port (or communicating with an HFB2 module to be converted to an optical port). The invention can reduce the development cost of the PROFIBUS-DP master station.

Description

technical field [0001] The invention relates to a general station field bus, which belongs to the technical field of communication. Background technique [0002] With the rapid development of computer technology, communication technology and control technology, advanced control modes are constantly produced in the field of industrial control. Fieldbus is a new technology developed in response to this situation. Among them, PROFIBUS is a complete and internationalized , Open, does not depend on the field bus standard of the manufacturer. PROFIBUS-DP is used for high-speed data transmission at the device level, and the communication controller (such as C101 mentioned in this article) communicates with scattered field devices (such as PLC, I / O, etc.) through high-speed serial lines. When PROFIBUS-DP is used for high-speed data transmission at the field level, the master station of the communication controller periodically reads the input information of the slave device and per...

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Problems solved by technology

But in fact, on the one hand, the communication rate of PROFIBUS is required to be higher, generally not lower than 187.5Kbps; Processor to complete this function, in order to ensure real-time communication, generally need to use dual-port RAM (shared memory can also be used, but it increases the difficulty of technical implementation, and the cost of the product is not greatly reduced) for communication ;Secondly, at present, in China, the research and development of PROFIBUS has been blank. On the one hand, the PROFIBUS specification is nearly a thousand pages, and the Chinese translation is not very good (whether it is EN50170 or IEC 51158), and there is no good English foundation. It is difficult to understand the PROFIBUS specification; finally, the PROFIBUS-DP specification is used in many places in China, but for specific projects, almost all of them adopt the complete set of integrated solutions from Siemens, and this set of solutions is very important for domestic technical engineers. Just learn how to use Siemens PROFIBUS configuration configuration tool proficiently, and download it to the specific application project on site. Siemens’ PROFIBUS-DP bus can be said to be completely transparent to domestic technicians. At this level, it is Unable to master any PROFIBUS underlying technology

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