PLC floating-point number and fixed-point number mutual conversion control system and method

Abstract

The invention belongs to the technical field of PLC control, and discloses a PLC floating-point number and fixed-point number mutual conversion control system and method. The system comprises: a central controller port, which is used for controlling an external storage controller and a floating-point number arithmetic operation module through a data bus, an address bus and a control bus; the external storage controller, which is used for transmitting operands to a register file module, a data distribution module, a queue module, an accumulator module and a floating-point operation module through internal data channel lines; and the floating-point number arithmetic operation module, which is used for carrying out single-precision floating-point number operation. According to the invention,the mutual conversion efficiency of the floating-point number and the fixed-point number is improved, and the conversion precision is high; a small PLC with an ARM-FPGA framework is adopted, an ARM serves as a control center, the high-speed parallel operation performance of an FPGA is applied, a control logic unit for mutual conversion of floating-point and fixed-point numbers is implanted into the FPGA processor, the defects of a single module are overcome, and high conversion precision and efficiency are achieved.

Description

technical field [0001] The invention belongs to the technical field of PLC control, and in particular relates to a PLC floating-point number and fixed-point number mutual conversion control system and method. Background technique [0002] At present, the closest existing technology: when PLC is used in industrial control systems, it needs to perform a large number of complex data processing and control algorithm operations, and can apply fixed-point calculations or floating-point calculations. Floating-point calculations have more advantages than fixed-point calculations. High effective precision, wide counting range and other characteristics, the speed of microprocessor instruction execution has been greatly improved now, and most control modules that require relatively high control precision and dynamic range for complex control use floating-point operations. [0003] In the general actual control module, especially when the analog quantity and the digital quantity need to...

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Problems solved by technology

[0005] (1) The existing PLC floating-point and fixed-point single modules have limitations and cannot meet complex control requir

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