Programmable logic controller based on various communication buses

Abstract

Aiming to solve the technical problem that a programmable logic controller with high communication data interaction rate and high communication system reliability, the invention discloses a programmable logic controller based on various communication buses, and belongs to the technical field of communication. The adopted technical scheme is that the programmable logic controller mainly includes a PLC master controller, a power supply module, a common I / O module and a high-speed communication module, wherein the programmable logic controller is provided with four communication buses, including an RS232 bus, a USB bus, a PCI bus and a CAN bus; the PLC master controller is provided with four communication bus interfaces, namely, an RS232 bus interface, a USB bus interface, a PCI bus interface and a CAN bus interface; and the PLC master controller accesses to the RS232 bus, the USB bus, the PCI bus and the CAN bus through the RS232 bus interface, the USB bus interface, the PCI bus interface and the CAN bus interface. The programmable logic controller based on the various communication buses is suitable for the field of communication.

Description

technical field [0001] The invention relates to a programmable controller based on multiple communication buses, in particular to a programmable controller which adopts multiple communication buses to realize communication between PLC main control and each module. Background technique [0002] Programmable logic controller is a kind of automation equipment widely used in the fields of industrial automation, process control and motion control. At present, the common PLC implementation method is that the PLC main controller and various PLC modules are installed on the same backplane. Communicate through some kind of parallel bus; in this way, if there is a problem with the bus or a certain module has an impact on the bus, it will inevitably affect the communication of the entire system, and when the amount of data is relatively large, all data will be concentrated on one bus. It will affect the refresh rate of data, and then affect the reliability of system communication. Co...

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Problems solved by technology

[0002] Programmable logic controller is a kind of automation equipment widely used in the fields of industrial automation, process control and motion control. At present, the common PLC implementation method is that the PLC main controller and various PLC modules are installed on the same backplane. Communicate through some kind of parallel bus; in this way, if there is a problem with the bus or a certain module has an impact on the bus, it will inevitably affect the communication of the entire system, and when the amount of data is relatively large, all data will be concentrated on one bus. It will affect the refresh rate of data, thereby affecting the reliability of system communication

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