Single-precision floating-point arithmetic operation control system and method for small PLC

Abstract

The invention belongs to the technical field of PLC control. The invention discloses a single-precision floating-point arithmetic operation control system and method for a small PLC. After an ARM maincontroller completes data configuration of an FPGA control module, the ARM main controller sends an operation instruction of single-precision floating-point operands to a dual-port RAM, then a central controller sends a bit instruction to a addressing storage control module to finish addressing and storage of the floating point operands, a single-precision floating point operand arithmetic operation module performs arithmetic operation on the addressing and storage floating point operands, and the central controller of the FPGA control module reads a single-precision operation instruction from the dual-port RAM. According to the invention, an ARM+FPGA is adopted, the ARM serves as a control center, the advantage of cooperative work of the ARM and an FPGA is fully utilized, high-speed parallel operation performance of the FPGA is used for achieving single-precision floating-point operand arithmetic operation, and a computer inputs an instruction from a human-computer interface of a PLCediting module according to an operation code and an operand.

Description

Technical field [0001] The invention belongs to the technical field of PLC control, and in particular relates to a single-precision floating-point arithmetic operation control system and method of a small PLC. Background technique [0002] At present, the closest existing technology: PLC is a digital computing operation electronic module specially designed for application in an industrial environment. It is mainly composed of a central processing unit, a memory, an input / output unit, a programmer, and a power supply. PLC takes microprocessor as the core, hardware and software realize its functions together. The total number of I / 0 points is within 256 points. Common small PLCs include S7-200 (Siemens), FX2N (Mitsubishi), OMRON's C60P, PLC -5 (AB company), etc. Some small PLCs from some manufacturers only have fixed-point arithmetic functions but do not have floating-point arithmetic. In some demanding occasions, floating-point arithmetic can be used to achieve function operations...

AI Technical Summary

Problems solved by technology

[0005] (1) The existing single-precision floating-point numbers have low calculation precision

[0006] (2) Existing single-precision floating-point processors are not flexible enough and overburdened

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