Absolute-type grating control system and control method based on industrial Ethernet bus

Abstract

The invention discloses an absolute-type grating control system and a control method based on an industrial Ethernet bus. A numerical-control system main station is sequentially connected with an input / output (IO) unit, a digital main-shaft drive device, a feeding shaft drive device and a grating adapter slave station protocol data unit (PDU) through the industrial Ethernet bus, and the grating adapter slave station PDU is connected with an X-axis linear grating, a Y-axis linear grating, a Z-axis linear grating and an angle grating. The grating adapter slave station is flexibly adaptive to different grating devices, so that higher communication throughput, higher communication rate and shorter communication period can be realized, direct high-speed cross communication between a servo system and the grating devices can be realized, and a simple and powerful technical support can be provided for the implementation of a closed-loop vibration inhabitation function. Meanwhile, a closed-loop control system adopts an annular topology, so that simplicity in connection can be realized, the slave station device can be flexibly expanded, the closed-loop control system has multiple system protection functions, and the safety and efficiency for running the system can be guaranteed.

Description

technical field [0001] The invention relates to the technical field of industrial Ethernet, in particular to an absolute grating control system and control method based on an industrial Ethernet bus. Background technique [0002] An automatic control system that consists of a signal forward path and a feedback path to form a closed loop, also known as a feedback control system. This is an automatic control system that includes power amplification and feedback so that the value of an output variable responds to the value of an input variable. After the numerical control device sends out the command pulse, when the command value is sent to the position comparison circuit, if the workbench does not move at this time, that is, when the position feedback signal remains unchanged, the difference between the command and the feedback is amplified by the amplifier to make the servo motor rotate. Transmission components such as ball screw nut pairs drive the machine tool table to mov...

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Problems solved by technology

[0004] Method 1 mainly has the shortcomings of not being able to flexibly adapt to various grating devices, it is difficult to realize multiple system protection functions, and increases the computing load of servo drives; method 2 mainly has the disadvantages of low fieldbus communication rate and small amount of communication data, which is difficult to implement Disadvantages of high-speed cross-communication of servo system and encoder device data

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