Distributed Control System Based on Canopen Protocol

Abstract

The invention discloses a distributed control system based on a CAN open protocol. The distributed control system comprises a master station and slave stations. Each slave station comprises a slave station control module and an interface expansion module. The interface expansion modules are connected to a plurality of distributed IO modules through an SPI bus. Each distributed IO module is provided with a plurality of IO ports connected with site devices. The interface expansion modules are used for conducting data processing and address resolution on device information collected by all the distributed IO modules and sending the information to the slave station control modules sequentially according to the set time sequence; the slave station control modules are used for packaging the collected device information and then sending the information to the master station, receiving the control information sent by the master station, processing the control information and then sending the processed information to the interface expansion modules sequentially according to the set time sequence; the interface expansion modules are further used for readdressing the control information and then sending the information to the corresponding distributed IO modules to control the corresponding site devices to act. By means of the distributed control system, the IO port expansion capacity of single slave station can be improved, and the IO port expansion mode is flexible.

Description

technical field [0001] The invention relates to field device control and data acquisition technology in the industrial field, in particular to a distributed control system based on the CANopen protocol. Background technique [0002] At present, the distributed control system based on the CANopen protocol generally uses the CAN bus to connect various slave stations in series, and each slave station is connected to field devices through a fixed number of IO terminals. [0003] CANopen defines a large number of application sub-protocol specifications for programmable systems, interfaces, and various devices. It is very convenient to realize the communication and interoperability between products of different companies, and has been widely used in various field communication fields. The networking of CANopen protocol distributed control system is as follows: figure 1 As shown, the slave station of the system includes CAN transceiver, MCU, and optocoupler isolation module. [0...

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a CANopen protocol-based system that can flexibly expand the IO port and improve the PDO utilization rate in view of the defects of the prior art that the PDO utilization rate of the single slave station is low and the IO port expansion method is not flexible enough. distributed control system

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