Backboard communication method

A backplane and communication technology, applied in the field of backplane communication, can solve problems affecting system stability, control period jitter, communication time fluctuation, etc., and achieve the effect of reducing fault processing time, intelligent processing, and improving system reliability.

Inactive Publication Date: 2016-12-21
BEIJING HOLLYSYS AUTOMATION & DRIVE
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

However, when the expansion module fails (such as hot reset), the communication timeout will occur in the backplane communication, and the communication time will fluctuate at this time (the waiting time for the communication timeout ...

Method used

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  • Backboard communication method
  • Backboard communication method

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Embodiment Construction

[0013] In this method of backplane communication, the backplane lines between the PLC main control and the expansion module include: communication lines, query lines, and feedback lines; the communication lines are two differential communication lines and the electrical characteristics are RS485, and the communication lines adopt the bus mode Connect all the expansion modules together; the query line and the feedback line are single-wire and the electrical characteristics are 3.3V to the ground, and the query line and the feedback line are connected in a daisy chain; Add a query line and a feedback line. These two signal lines provide such an interaction mechanism for two adjacent expansion modules: the front-level expansion module accesses the state of the subsequent expansion module through the query line, and the latter expansion module through The feedback line responds its own status to the front-end expansion module.

[0014] Since the present invention adds a query line...

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Abstract

The invention discloses a backboard communication method, is additionally equipped with a fault diagnosis mechanism, improves system reliability, intelligently processes faults, reduces the fault processing duration and has small influence on a system control period. According to the backboard communication method, backboard wires between a PLC main controller and expansion modules comprise communication wires, a query wire and a feedback wire, the communication wires are two difference communication wires, an electrical characteristic of the communication wires is an RS485, all the expansion modules are connected through the communication wires in a bus mode, the query wire and the feedback wire are respectively a single wire, an electrical characteristic is ground 3.3V, and the query wire and the feedback wire are connected in a daisy chain mode; according to the method, one query wire and one feedback wire are additionally arranged between two adjacent expansion modules, the two adjacent expansion modules are provided with an interaction mechanism through the two signal wires, a state of a back-stage expansion module is accessed by a front-stage expansion module through the query wire, and a self state of the back-stage expansion module is fed back to the front-stage expansion module through the feedback wire.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits and industrial control, and in particular relates to a backplane communication method. Background technique [0002] Programmable controller, referred to as PLC (Programmable Logic Controller), refers to a new type of industrial control device based on computer technology. PLC is a type of programmable memory used for internal storage of programs, execution of user-oriented instructions such as logic operations, sequence control, timing, counting and arithmetic operations, and control of various functions through digital or analog input / output. type of machinery or production process. [0003] Such as figure 2 As shown, when the programmable logic controller is put into operation, its working process is generally divided into three stages, namely, input sampling, user program execution, and output refresh. The completion of the above three stages is called a scan cycle. During the e...

Claims

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Application Information

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IPC IPC(8): G05B19/05
CPCG05B19/054
Inventor 李梦晨行增晖杨鹏张丽娜侯林锋
Owner BEIJING HOLLYSYS AUTOMATION & DRIVE
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