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Input/output (I/O) module of serial peripheral interface (SPI) bus expanding embedded programmable logical controller (PLC)

A technology of SPI bus and SPI module, which is applied to program control and electrical program control in sequence/logic controllers, can solve problems such as unstable system operation and increased complexity of the control system, and achieve convenient application and simple circuit design , low cost effect

Inactive Publication Date: 2012-05-02
HUAIYIN TEACHERS COLLEGE
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Problems solved by technology

At present, the multi-level PLC control method is usually adopted, which will greatly increase the complexity of the entire control system, and the operation of the system is unstable.

Method used

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  • Input/output (I/O) module of serial peripheral interface (SPI) bus expanding embedded programmable logical controller (PLC)
  • Input/output (I/O) module of serial peripheral interface (SPI) bus expanding embedded programmable logical controller (PLC)
  • Input/output (I/O) module of serial peripheral interface (SPI) bus expanding embedded programmable logical controller (PLC)

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Embodiment Construction

[0020] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0021] The invention proposes a design method for respectively expanding 16-way input and 16-way output through the combination of the SPI bus of the MCU and the shift register. The three-wire SPI bus module works in Master mode, providing synchronous clock input to HC165 and HC595. In the main module, SPI1 of TMS470R1A288 is used for communication between the main module and the expansion module I / O, and SPI2 is used to expand the I / O points of the main module. The SPI signal line SPI2 master-in-slave-out (SOMI) is used to expand the number of input points and connect to the serial output terminal of HC165; the signal line SPI2 master-out slave-in (SIMO) is used to expand the number of output points and connect to the serial input terminal of HC595.

[0022] TMS470R1A288 is a high-performance embedded microprocessor with ARM7TDMI co...

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Abstract

The invention discloses an input / output (I / O) module of a serial peripheral interface (SPI) bus expanding embedded programmable logical controller (PLC), which comprises an SPI input expending circuit and an SPI output expanding circuit, wherein the signal output port of the SPI input expending circuit is connected with the master-in slave-out port of an SPI module in the PLC, the signal input port of the SPI output expanding circuit is connected with the master-out slave-in port of the SPI module in the PLC, and the clock signal ends of the SPI input expanding circuit and the SPI output expanding circuit are connected with the clock signal end of the SPI module in the PLC; and the control signal ends of the SPI input expanding circuit and the SPI output expanding circuit are connected with the control signal end of the I / O module in the PLC. The I / O module of the SPI bus expanding embedded PLC has the characteristics of simple design, convenience in application and high reliability, and is suitable for PLCs.

Description

technical field [0001] The invention relates to a programmable controller, in particular to an I / O extension module in the programmable controller, in particular to an I / O module of an SPI bus extension embedded PLC. Background technique [0002] At present, due to the characteristics of simple structure, convenient programming, excellent performance and convenient application, PLC has become the most widely used industrial controller. However, with the increase of application complexity, the application bottleneck of PLC is also displayed. The embedded intelligent programmable logic controller, the main module input / output point range generally ranges from 16 points to 60 points, but part of the I / O ports are multiplexed for After the control and communication interfaces, only about 30 are reserved for I / O. For modules larger than 30 points, the expansion of I / O must be considered. At present, the multi-level PLC control method is usually adopted, which will greatly incr...

Claims

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Application Information

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IPC IPC(8): G05B19/05
Inventor 李磊俞阿龙曹凤莲李正孙红兵
Owner HUAIYIN TEACHERS COLLEGE
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