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Control structure for reducing bus communication rate used for foundation in-situ bus

A foundation field and bus communication technology, applied in the general control system, adaptive control, control/adjustment system, etc., can solve the problems affecting the real-time and certainty of the control system, difficult to quickly detect sensor faults, multi-network bandwidth, etc. , to achieve the effect of improving real-time performance and certainty, reducing communication burden, and reducing losses

Inactive Publication Date: 2004-11-24
SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
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AI Technical Summary

Problems solved by technology

Frequent bus communication will inevitably occupy more network bandwidth, affecting the real-time and certainty of the control system, especially under the communication mechanism of Ethernet field bus carrier sensing / conflict avoidance, this problem is more prominent
On the other hand, in the existing control system, it is difficult to quickly detect the fault of the sensor or (and) the actuator; even if the fault of the sensor is detected, the control system will enter a safe state and stop the control of the controlled object
This will inevitably cause losses to production, and even dangerous situations

Method used

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  • Control structure for reducing bus communication rate used for foundation in-situ bus
  • Control structure for reducing bus communication rate used for foundation in-situ bus
  • Control structure for reducing bus communication rate used for foundation in-situ bus

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Embodiment Construction

[0024] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0025] Such as figure 1 As shown, the typical FOUNDATION fieldbus control system in the prior art consists of an analog input function block (Analog Input, referred to as AI), an analog output function block (Analog Output, referred to as AO) and a control function block (Proportional Integral Derivative, PID for short) consists of three functional blocks. In each control cycle, the analog input function block AI detects the current controlled physical quantity through the sensor, and after filtering and linearization, sends the sampled value to the control function block PID. The control function block PID calculates the control quantity, and sends the control quantity to the actuator through the analog quantity output function block AO to complete the control. In addition to control function blocks, a device can also have input function blocks or output f...

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Abstract

The control structure includes two pieces of equipment. The first equipment includes one analog amount input module connected to the sensor; and the second equipment includes control module, analog amount output module connected to the executor. The first equipment has one increased prediction control module and one control module with the same parameters as that in the second equipment; and the second equipment has also one increased prediction control module the same as that in the first equipment. Universal configuration software is used in configuring the parameter connection of the modules in the first equipment and the second equipment. The present invention reduces the bus network communication load to raise the real-time property and determinacy of bus network in data communication. The present invention also warns the error sampling data, acting as the second sensor to raise the stability of the control system.

Description

technical field [0001] The present invention relates to fieldbus (FOUNDATION Filedbus, referred to as FF) technology, specifically a kind of control structure used for FOUNDATION Fieldbus to reduce bus traffic, belonging to FOUNDATION Fieldbus flexible function block (Flexible Function Block) A sort of. Background technique [0002] Function blocks are one of the most distinctive technologies of FOUNDATION Fieldbus. Function block is a software logic processing unit with data structure as the core, which completes an independent and complete control function. Logically, the control system of FF can be regarded as composed of several function blocks. The functional blocks that make up the control system can be in the same device, or scattered in multiple devices. After configuration by the configuration software, they cooperate to complete the control algorithm. A field device may contain multiple function blocks, and these function blocks may be standard function blocks d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/00G05B13/02
Inventor 王天然于海斌王宏吕勇杨志家周侗
Owner SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
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