System and method for accessing PLC of BACnet building system

A building and system server technology, applied to the PLC system, can be connected to the PLC field of the BACnet building system, to achieve the effect of enhancing monitorability and operability, saving development time and cost

Inactive Publication Date: 2019-04-16
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the technical defect that the existing PLC cannot be directly connected to the building control system implementing the BACnet protocol, the present invention provides a PLC system that can be connected to the BACnet building system, and also provides a system that can be connected to the BACnet building system. PLC method

Method used

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  • System and method for accessing PLC of BACnet building system
  • System and method for accessing PLC of BACnet building system
  • System and method for accessing PLC of BACnet building system

Examples

Experimental program
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Embodiment 1

[0044] Such as figure 1 , figure 2 As shown, a PLC device that can be connected to a BACnet building system includes a microprocessor 1, a serial port module 2, a download circuit 3, an output I / O port 4, an input I / O port 5, and a BACnet interface module 6 ;in:

[0045] The serial port module 2, the download circuit 3, the output type I / O port 4, and the input type I / O port 5 are respectively electrically connected to the microprocessor 1;

[0046] The serial port module 2 is used to write the ladder diagram program to the embedded PLC, allowing the upper computer to communicate with the embedded PLC;

[0047] The download circuit 3 is used for downloading the main program of the microprocessor 1;

[0048] The BACnet interface module 6 connects the embedded PLC to the BACnet building system.

[0049] More specifically, the main body of the serial port module 2 is a MAX3232 chip, which converts serial signals into TTL levels, and allows the microprocessor 1 to receive and...

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Abstract

The invention provides a method for accessing a PLC of a BACnet building system. The method comprises the following steps that an embedded PLC is initialized, and a main program is downloaded; an upper computer is connected, and a ladder diagram program is downloaded into the embedded PLC; the embedded PLC is connected to the BACnet building system, the BACnet building system recognizes attributesand objects owned by the embedded PLC, and accesses and modifies the objects; a device capable of accessing the PLC of the BACnet building system comprises a microprocessor, a serial port module, a downloading circuit, an output type I / O port and a BACnet interface module; the invention further provides a system for accessing the PLC of the BACnet building system, accessing the embedded PLC intothe BACnet system for Running is realized, the development time and cost of the control system are saved, and the monitoring performance and the operability of the embedded PLC are enhanced as well.

Description

technical field [0001] The present invention relates to the technical field of building automation, more specifically, to a PLC system that can be connected to a BACnet building system, and also to a PLC method that can be connected to a BACnet building system. Background technique [0002] The BACnet protocol is a building automatic control network data communication protocol. It is a global standard network data communication protocol. It provides open specifications and standards, enabling automatic control equipment and systems of intelligent buildings to achieve information exchange and sharing. [0003] Programmable logic controller (PLC) is a kind of field controller with high stability and easy programming. It is widely used in building control systems such as air conditioners and elevators. The embedded PLC cannot be directly connected to the building control system that implements the BACnet protocol. Contents of the invention [0004] In order to overcome the t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/05
CPCG05B19/054G05B2219/11101
Inventor 赵宇皞许锦标曾珞亚
Owner GUANGDONG UNIV OF TECH
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