Dual-data bus-type master-slave controller with built-in PLC function

Abstract

The invention relates to a dual-data bus-type master-slave controller with a built-in PLC function; the dual-data bus-type master-slave controller comprises a master controller unit, a slave controller unit, an analog quantity unit, a digital quantity unit and an algorithm execution unit; two data buses are arranged in the controller, wherein one common data bus is time-shared by the master controller unit and the slave controller unit, so sampling and outputting of the analog quantity unit and the digital quantity unit can be realized, and the master controller unit has absolute priority right of usage at any time, and the controller employs an address bus to carry out addressing operation; the controller completely isolates the functions of the master controller unit and the slave controller units, so regulated tasks can be independently finished, and high speed communication and data exchange can be realized, thereby ensuring function integration property and application expansibility of the whole controller; simultaneously, an external PLC and relative circuit configuration cost of an external sampling output can be saved, and cost of frequent upgrades of controller control chips can be saved.

Description

technical field [0001] The invention relates to a dual data bus master-slave controller with a built-in PLC function, in particular to the technology of the controller's system architecture, function division and coordination work. Background technique [0002] In the prior art, it is necessary to use equipment including a controller. In addition to implementing the corresponding control algorithm and completing the functions of the equipment, the controller also needs to sample and output the analog quantities required by the system, as well as to perform digital control for the system. Quantity sampling and output; in some applications, it also needs to have external display and communication functions. When the equipment using the controller itself is more complicated, or needs to deal with more external analog and digital quantities, or needs to have a strong display function, or needs to have more external communication functions, the controllers in the prior art often ...

AI Technical Summary

Problems solved by technology

However, according to the functional requirements of the equipment using the controller, the controller generally requires a faster response speed for the sampling and output of analog and digital quantities, and even in many cases requires real-time sampling for real-time control; while the external PLC generally responds faster. Slow, so it is difficult for the controller and external PLC to share the sampling and output of analog and digital quantities, as well as unified external display and communication

This leads to a waste of both resources, whether it is the repeated configuration of resources between the controller and the external PLC, or the waste of sampling and output channels of analog and digital quantities, and even the external provision of supporting conditions for these sampling channels. waste of resources

[0006] In addition to increasing costs and wasting resources, there are also inconsistencies in system integration and control performance between the controller 9 and the external PLC, resulting in a low degree of system integration between the two

The controller and the external PLC are two independent systems. One system requires fast processing speed, while the other system requires slow processing speed. The sampling speed of the quantity is slow, and it is generally difficult to use it due to the poor real-time performance when sending it to the controller through communication.

In addition, the external display and communication of the system can be realized by both the controller and the external PLC, and it is handled by the controller when there is no external PLC. Once the external PLC is added, if it is handled by the external PLC, many internal The program must be rewritten and debugged, which not only increases the operating cost, but also prolongs the application time; in order to standardize the internal program of the system, the display and communication functions have to be completed by the controller in many cases

Therefore, in the application where both the controller and the external PLC exist, in terms of the function allocation of the two, the controller still needs to spend a lot of resources to process the sampling and processing of analog and digital quantities in addition to the corresponding control algorithm functions. Output, and external display and communication, as well as external PLC communication; this takes up a lot of precious resources of the controller, greatly reduces the efficiency of the controller, and limits the controller to achieve more complex control algorithms, which in turn makes the In some more complex controls, more powerful controllers have to be used continuously, which increases the cost of the controller again on the other hand

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