Configurable PLC based on PCIe bus

Abstract

The invention discloses a configurable PLC based on a PCIe bus. The PLC comprises a microcontroller, an FPGA, a PHY chip, a memory unit, a digital quantity input unit, a digital quantity output unit,an analog quantity input unit, and an analog quantity output unit. A realization mode of the PCIe bus is characterized in that the PCIe bus is connected to an FPGA device through a connector, the PCIebus is realized by the FPGA, and a device connection mode of a point-to-point serial connection is formed. The realization mode of an online configurable function is characterized in that logic function online configuration is realized through using an architecture scheme of a single-chip Cortex-4ARM and a PHY chip without a peripheral memory; and five-language programming compilation parsing execution of the most common IEC61131-3 is possessed and a ladder diagram, a function block diagram, a sequence function diagram, an instruction list and a structured text are included. The configurablePLC has the characteristics of a high transmission bandwidth, high transmission reliability, a large data volume, a high transmission rate, safe and timely data transmission, diversified functions, low cost, scalability, and a flexible and configurable interconnection structure.

Description

technical field [0001] The invention belongs to the field of industrial control automation, in particular to a configurable PLC based on a PCIe bus. Background technique [0002] In the field of traditional industrial control, many I / O data of PLC are completed based on hard wiring. The problems of this method are: many cables are laid, the cost is high, the project implementation intensity is high, and the I / O control method is less flexible, focusing on the improvement of a single performance, and it is impossible to dynamically configure circuit functions according to actual needs. Scalability is poor. [0003] With the development of technology, field bus and industrial control bus technology are applied to PLC, which saves a lot of hard wiring, transmitters and other hardware devices. In the bus mode, once the number of devices connected to the bus increases, the actual transmission rate of each device will decrease, and the performance cannot be guaranteed. In addit...

AI Technical Summary

Problems solved by technology

[0002] In the field of traditional industrial control, many I / O data of PLC are completed based on hard wiring. The problems of this method are: many cables are laid, the cost is high, the project implementation intensity is high, and the I / O control method is less flexible, focusing on the improvement of a single performance, and it is impossible to dynamically configure circuit functions according to actual needs. Poor scalability

[0003] With the development of technology, field bus and industrial control bus technology are applied to PLC, which saves a lot of hard wiring, transmitters and other hardware devices. In the bus mode, once the number of devices connected to the bus increases, the actual transmission rate of each device will decrease, and the performance cannot be guaranteed

In addition, there are delays in the transmission of data packets in network communication, instantaneous errors and data packet loss in the communication system, and inconsistencies in the order of sending and arriving, etc., which will destroy the original determinism of the traditional control system, making the analysis and synthesis of the control system become difficult. To complicate matters further, the performance of the control system is negatively affected

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