PLC system and control method thereof

Abstract

The application discloses a PLC system and a control method thereof. The PLC system comprises N control modules which are sequentially cascaded. The first control module is a CPU module and the othercontrol modules are all expansion modules. The ith control module is used for receiving an extended address sent by the (i-1) th control module as a module address of the control module and generatinga new extended address according to the module address, wherein the i is larger than 1 and is less than or equal to N. Different from the traditional mode of allocating extended addresses to all extension modules by a main control CPU module, the mode employed by the disclosed PLC system is characterized in that the CPU module is in cascade connection with a plurality of extension modules and each extension module has the capacity of actively allocating extension addresses, so that the signal jitter and interference in communication between the extension module and the external space are eliminated based on the cascaded topological mode and the rapid transmission of information is guaranteed. And the access of several kinds of extension modules to the PLC system for reliable operation canbe supported.

Description

technical field [0001] The invention relates to the field of industrial automation control, in particular to a PLC system and a control method thereof. Background technique [0002] As the core component of industrial automation control, PLC (Programmable Logic Controller) is often used in various automated production lines to meet different technical requirements, such as general switch input acquisition and control, general switch output control, analog Quantity input acquisition and control, analog output control, temperature acquisition and control, etc. These technical requirements are usually realized in the form of expansion modules. [0003] However, in the existing technology, the addressing of the expansion modules is completed by the main control board and assigned to each expansion module. There is a large time delay and signal interference in the information transmission between the main control board and each expansion module, and the communication effect is lo...

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Problems solved by technology

[0003] However, in the existing technology, the addressing of the expansion modules is completed by the main control board and assigned to each expansion module. There is a large time delay and signal interference in the information transmission between the main control board and each expansion module, and the communication effect is low. not ideal

At the same time, this distribution method requires more wiring, which is not conducive to module expansion

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