Programmable logic controller and expansion module interface

A technology of expanding modules and programming logic, applied in the field of electronics, can solve problems such as reducing the communication efficiency between the main module and the expansion module, and achieve the effect of improving communication efficiency and reliability and resolving conflicts.

Inactive Publication Date: 2008-03-19
上海正航电子科技有限公司
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Problems solved by technology

This mode greatly reduces the communication efficiency between the main module and the expansion module

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  • Programmable logic controller and expansion module interface
  • Programmable logic controller and expansion module interface

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Embodiment Construction

[0013] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. On the premise of the technical solution of the present invention, detailed embodiments and processes are provided, but it should be understood that the scope of protection of the present invention is not limited to the following implementation example.

[0014] Fig. 1 is the schematic diagram of interface of programmable controller of the present invention and a plurality of expansion modules, as can be seen from the figure, a kind of interface of programmable logic controller and expansion module, except power line and ground wire, also includes main module and a plurality of The expansion module is characterized in that it adopts the SPI interface line of / SS, SCK, MOSI, MISO four-wire standard and two digital logic lines: INT application interrupt control line and CTLx sequence connection control line to form an interface bus, the main module an...

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Abstract

The present invention relates to an interface for programmable logic controllers and expansion modules, and comprises a main module and a plurality of extension modules, the present invention is characterized in that a four-line standard SPI interface wire and two digital logic lines are used: a control line of the bus is interrupted, while the bus for forming the interface of the control line is connected in order; the double-way communication of the main module and all expansion modules are in token-control. In the process of the system initialization, the present invention can automatically complete the address distribution of every expansion module, and can finish the control and double-communication of data and information between the main module and a plurality of expansion modules, and can realize the input, output and functional expansion of a programmable logic controller. The present invention has the advantages that the present invention successfully realizes the communication interface function between the programmable logic controller and the expansion modules, completes the double-way of data and control characters, and has the automatic distribution function of addresses of the expansion modules; in addition, the present invention can effectively solve the conflicts during communication, and can improve the communication efficiency and reliability between the programmable controller as well as the expansion modules.

Description

technical field [0001] The invention belongs to the field of electronic technology, and relates to the interface between a programmable logic controller and a plurality of expansion modules applied in the application field of industrial control. Background technique [0002] With the wide application of programmable logic controllers, a single programmable logic controller cannot meet the requirements in many occasions due to its limited functions. In the actual control process, it is usually necessary to expand the functions of a single controller, that is, by providing other performance Modules, such as input / output analog expansion modules, digital expansion modules, network connection modules, etc., to expand the performance of the system. The modular system can not only be applied to simple systems, but also can be applied to complex systems by expanding the corresponding functional modules. Therefore, the programmable function logic controller needs to provide addition...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/05
Inventor 孙航
Owner 上海正航电子科技有限公司
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