A Method for Occasional Fault Diagnosis of Fieldbus

Abstract

The invention discloses an occasional fault diagnosis method of a field bus. The occasional fault diagnosis method comprises steps as follows: a master station is provided with an effective communication cycle counter used for recording the cycle number of effective cycle data frames transmitted by the master station in the normal communication stage of the field bus as well as two reception counters used for recording the cycle number of the correct and effective cycle data frames received from a port A and a port B of the master station; each slave station is provided with two reception counters used for recording the cycle number of the correct and effective cycle data frames received from a port A and a port B of the slave station; the master station judges whether each slave station receives the correct and effective cycle data frames in the communication cycle according to CRC (cyclic redundancy check) of the received effective cycle data frames; when an occasional communication fault occurs to the field bus, the master station enters a fault processing state; the master station positions communication connection with the occasional communication fault according to numerical differences of a bus topology structure, the reception counters of the master station and the reception counters of the slave stations. With the adoption of the method, connection with the occasional fault in the field bus of a numerical control system can be quickly and accurately positioned.

Description

technical field [0001] The present invention relates to the data communication between the field bus based on industrial Ethernet and related numerical control equipment products, especially relates to the field bus based on industrial Ethernet and numerical control system, servo drive, IO data module, PCI industrial control data acquisition card and the field of numerical control The data communication of other functional modules is specifically a field bus sporadic fault diagnosis method. Background technique [0002] The numerical control system field bus is a serial, digital, multi-point, two-way communication network used to realize real-time data communication between the numerical control device, spindle unit, servo drive unit, I / O unit and other components. It is a key technology to connect and improve the control accuracy and reliability of the system. It has design requirements and operating characteristics such as high speed, high real-time performance, high synch...

AI Technical Summary

Problems solved by technology

[0004] In the traditional connection mode of the CNC system, point-to-point connections are used between the CNC device and the spindle unit, servo drive unit, I / O unit, etc. This connection method is simple for fault location, but the communication network structure is complex and the communication quality is not high.

In the field bus connection mode of the CNC system, the CNC device and the spindle unit, servo drive unit, I / O unit, etc. are connected in a linear topology or a ring topology connection. When a fault occurs in this connection mode, it is difficult to accurately locate

When sporadic faults occur, fault location is particularly difficult, which brings a lot of trouble to the commissioning service personnel for on-site maintenance. Sporadic faults refer to faults that occur only once in a few hours, or even days or months

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