Universal small-sized programmable controller and control method thereof

Abstract

The invention relates to a general miniature programmable controller and a controlling method of the same. The programmable controller comprises a programmable device, a PLC mainframe, 1-4 human-machine interface modules, an extensive module and a CAN bus. The PLC mainframe consists of a flush type microprocessor ARM, an analog quantity input and output module, a digital quantity input and output module, a FLASH memory, a SDRAM memory, an EEPROM memory and an FPGA reconfigurable control algorithm coprocessor, the maximum of a configured I / O point size reaches 256, the maximum of an A / D path number reaches 24, and the maximum of a D / A path number reaches 12. The controlling method is as follows: automatic control of a complicated controlled object is realized, the input and output extensive module flexibly is configured and the computing time of the control algorithm is enabled not to occupy the time for the general miniature PLC to execute program by controlling program initialization, controlling program execution data preparation, controlling program execution and controlling program data transmission steps with intelligent control algorithm compiled in the FPGA.

Description

technical field [0001] The invention relates to an industrial general automatic control device, in particular to a general small programmable controller (PLC) based on CAN field bus and embedded microprocessor ARM+FPGA and its control method. Background technique [0002] At present, a small PLC is a PLC with a switching input and output of less than 256 points. It is a general-purpose automatic control device mainly used for sequential control of industrial equipment. It usually uses a Soc chip specially designed by each company or an application single-chip microcomputer as the control core. The controlled object needs flexible configuration and selection of various input and output expansion modules. Small PLCs have powerful sequential logic control functions; Due to the bus standard, the various input and output expansion modules for its expansion must be installed on the guide rails designed by their respective companies, or must be close to the CPU module of the small ...

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Problems solved by technology

[0002] At present, a small PLC is a PLC with a switching input and output of less than 256 points. It is a general-purpose automatic control device mainly used for sequential control of industrial equipment. It usually uses a Soc chip specially designed by each company or an application single-chip microcomputer as the control core. The controlled object needs flexible configuration and selection of various input and output expansion modules. Small PLCs have powerful sequential logic control functions; Due to the bus standard, the various input and output expansion modules for its expansion must be installed on the guide rails designed by their respective companies, or must be close to the CPU module of the small PLC. The small PLC host and its expansion of various input and output expansion modules only It can be installed in an electric cabinet. If the detection points and control points of the controlled object controlled by a small PLC are scattered in the equipment, some detection points and control points are far away from the electric cabinet, which will lead to the detection of the controlled object. Points and control points to the small PLC connection wire is long; a small PLC can only be equipped with a man-machine interface module; in addition, although most small PLCs can be connected with the PLC integrated control system of their respective companies through the field bus, as a lower computer For field control devices, its input and output expansion modules can be configured with A / D and D / A modules to realize PID algorithm control, but it is difficult for small PLCs to embed more complex control algorithms into PLC programs to realize automatic control of complex control objects

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