Realization system and method of profibus-dp master station based on cpld
A technology for realizing system and master station, applied in the directions of comprehensive factory control, comprehensive factory control, electrical program control, etc., can solve the problems of high development cost and low communication efficiency of the master station, so as to reduce the possibility of system errors and improve the system performance, cost reduction
Active Publication Date: 2015-12-16
SUZHOU INOVANCE CONTROL TECH CO LTD
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[0007] The technical problem to be solved by the present invention is to provide a system and method for realizing a PROFIBUS-DP master station based on CPLD for the problems of high development cost of the above-mentioned PROFIBUS-DP master station and low communication efficiency of the master station
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[0026] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0027] The CPLD-based PROFIBUS-DP master station realization system and method of the present invention do not need a special CPU, and the master control CPU directly realizes the master station protocol. The RAM data is shared between the main control CPU and the ASIC chip, and the bus arbitration between the two is realized by the CPLD.
[0028] Such as figure 2As shown, it is a schematic diagram of an embodiment of the system implementation of the CPLD-based PROFIBUS-DP master station of the present invention. The system includes a main control CPU 21 , a complex programmable logic device (CP...
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The invention provides a PROFIBUS-DP (process field bus-decentralized periphery) master realization system based on a CPLD (complex programmable logic device), which comprises a master control CPU (central processing unit), a CPLD, an ASIC (application specific integrated circuit) chip, a bus accessing to an RAM (random access memory) and a plurality of level switch chips, wherein the master control CPU is connected with the bus accessing to the RAM by the CPLD; the ASIC chip is connected with the bus accessing to the RAM by the level switch chips; and the CPLD assigns a control right of the bus accessing to the RAM to the master control CPU or the ASIC chip according to a bus utilization request of the master control CPU or the ASIC chip and a state of the bus accessing to the RAM. The invention further provides a corresponding method. Since the master control CPU and the ASIC chip share the control right of the bus, peripheral devices are decreased, the cost is lowered, the system performances are improved, and the possibility of a system error is reduced.
Description
technical field [0001] The invention relates to the field of automatic control, more specifically, to a system and method for realizing a PROFIBUS-DP master station based on CPLD. Background technique [0002] PROFIBUS-DP is used to realize high-speed data transmission at the field level, and its master station periodically reads the input information of the slave station and periodically sends output information to the slave station. Although the PROFIBUS-DP protocol is public, its master station core technology has been monopolized by a few large companies such as Siemens in Germany. [0003] At present, the development of the domestic DP master station is mainly through the purchase of special modules, and then secondary development. The development cycle of this development method is short and the risk is small, but the cost of purchasing a dedicated module is expensive, and there is no core technology, which greatly reduces the competitiveness of the product. [0004]...
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IPC IPC(8): G05B19/418
CPCY02P90/02
Inventor 胡平
Owner SUZHOU INOVANCE CONTROL TECH CO LTD