Interface expansion method of programmable logic controller and frequency converter

Abstract

An embodiment of the invention discloses an interface expansion method of a programmable logic controller and a frequency converter. The method comprises the steps of establishing internal high-speedcommunication between the programmable logic controller and the frequency converter to realize data interaction; arranging a first mapping storage area and a second mapping storage area in the programmable logic controller and the frequency converter respectively; and interacting data of the first and second mapping storage areas between the programmable logic controller and the frequency converter through the internal high-speed communication, so that interface expansion of the programmable logic controller and the frequency converter is realized. According to the interface expansion method,the programmable logic controller and the frequency converter are connected through an internal high-speed communication interface, and the mapping mode is adopted, so that the interface between the programmable logic controller and the frequency converter is expanded. The cost of information interaction between the frequency converter and the programmable logic controller is reduced, and the interaction speed and reliability are improved.

Description

technical field [0001] The invention relates to the technical field of rotation control, in particular to an interface expansion method between a programmable logic controller and a frequency converter. Background technique [0002] In the field of industrial automation control, programmable logic controller (PLC) and frequency converter are very common controllers and drives respectively. The PLC and the frequency converter realize information exchange through industrial communication standards or hardware interfaces. The two are well decoupled and can be controlled independently or in combination. The combination of the two can flexibly realize the rotation control requirements and control performance in the rotation control industry. [0003] One solution adopted in the prior art is that the PLC is responsible for the logic control, and the frequency converter is responsible for the motor control, so as to drive the motor to run normally. However, the disadvantage of th...

AI Technical Summary

Problems solved by technology

However, the disadvantage of this technical solution is that multiple CPUs are controlled, no modularization is achieved, the inverter solution is complicated, and the cost increases

Reduced applicability and flexibility of frequency converters

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