CN113721532A - PLC CPU extension module multi-bus protocol self-adaption method - Google Patents

Abstract

The invention discloses a multi-bus protocol self-adapting method of an expansion module of a CPU of a PLC, which belongs to the technical field of the PLC and comprises an expansion module bus protocol self-adapting controller and an expansion module bus interface, wherein the expansion module bus protocol self-adapting controller comprises an expansion module bus protocol controller and an expansion module bus protocol generator.

Description

PLC CPU extension module multi-bus protocol self-adaption method

Technical Field

The invention relates to the technical field of PLC, in particular to a multi-bus protocol self-adaption method for an extension module of a CPU of a PLC.

Background

The CPU of the PLC mainly has expansion module bus protocols such as CTS7 and CTH2 at present, each type of CPU can only identify and support the expansion module of the same type of protocol at present, so that the management difficulty is increased in production and production management, different warehouse storages are needed, the production management cost is increased, the management difficulty and the management cost are also agreed to be increased for market sales and after-sales service, the above methods are not favorable for large-scale production and production efficiency improvement of products, and are not favorable for further improvement of product quality, convenient management of products and product cost profit optimization, and a plurality of bus protocol self-adaption methods of the expansion module of the CPU of the PLC are provided.

Disclosure of Invention

The invention aims to provide a method for adapting various bus protocols of an expansion module of a CPU of a PLC (programmable logic controller), so as to solve the problems that the mass production and the production efficiency improvement of products are not facilitated, the product quality is not further facilitated, the convenient management of the products and the profit optimization of the product cost are not facilitated.

In order to achieve the purpose, the invention provides the following technical scheme: a self-adaptive method for multiple bus protocols of an expansion module of a CPU of a PLC comprises an expansion module bus protocol self-adaptive controller and an expansion module bus interface, wherein the expansion module bus protocol self-adaptive controller comprises an expansion module bus protocol controller and an expansion module bus protocol generator, and the specific implementation method comprises the following steps:

the method comprises the following steps: the expansion module bus protocol controller starts from a certain protocol according to a certain sequence, and the expansion module bus protocol generator communicates with the expansion module through an expansion module bus interface according to the protocol to confirm the handshake;

step two: if a certain bus protocol succeeds in n-time handshaking, the expansion module connected behind the CPU can be confirmed to be the bus protocol and carry out normal communication operation according to the protocol;

step three: if a certain protocol is unsuccessful after n times of handshaking, the expansion bus protocol controller will switch to another bus protocol to perform handshaking, and repeat the process of the second step until all the bus protocols are completed.

Preferably, the expansion module bus protocol generator includes two or more types of expansion bus protocols.

Compared with the prior art, the invention has the beneficial effects that: the method for automatically adapting the plurality of bus protocols of the expansion module of the CPU of the PLC is characterized in that the controller which is self-adapting to the bus protocols of the expansion module is additionally arranged, and the expansion modules with different protocols hung behind the CPU of the PLC can be automatically identified through the controller, so that the product types of the CPU can be immediately reduced, the scale of a single product can be immediately improved, the expansion modules with various protocols can be supported and identified, and the production, the sale and the subsequent maintenance on the market of the expansion modules are not influenced.

Drawings

FIG. 1 is a schematic diagram of the operation of an expansion module bus protocol adaptive controller according to the present invention;

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides a multi-bus protocol self-adaptive method for an expansion module of a CPU of a PLC (programmable logic controller), referring to a figure 1, comprising an expansion module bus protocol self-adaptive controller and an expansion module bus interface, wherein the expansion module bus protocol self-adaptive controller comprises an expansion module bus protocol controller and an expansion module bus protocol generator, and the specific implementation method comprises the following steps:

the method comprises the following steps: the expansion module bus protocol controller starts from a certain protocol according to a certain sequence, and the expansion module bus protocol generator communicates with the expansion module through an expansion module bus interface according to the protocol to confirm the handshake;

step two: if a certain bus protocol succeeds in n-time handshaking, the expansion module connected behind the CPU can be confirmed to be the bus protocol and carry out normal communication operation according to the protocol;

step three: if a certain protocol is unsuccessful after n times of handshaking, the expansion bus protocol controller will switch to another bus protocol to perform handshaking, and repeat the process of the second step until all the bus protocols are completed.

The expansion module bus protocol generator comprises two or more types of expansion bus protocols.

In summary, the invention adds the self-adaptive controller of the bus protocol of the expansion module, and the controller can automatically identify the expansion modules with different protocols hung behind the CPU of the PLC, thereby immediately reducing the product types of the CPU, immediately improving the scale of a single product, simultaneously supporting and identifying the expansion modules with various protocols, and not influencing the production, the sale and the subsequent maintenance of the expansion modules on the market.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

While the invention has been described above with reference to an embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the various features of the embodiments disclosed herein may be used in any combination, provided that there is no structural conflict, and the combinations are not exhaustively described in this specification merely for the sake of brevity and conservation of resources. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims (2)

1. A PLC CPU extension module multiple bus protocol self-adapting method is characterized in that: the expansion module bus protocol self-adaptive controller comprises an expansion module bus protocol self-adaptive controller and an expansion module bus interface, wherein the expansion module bus protocol self-adaptive controller comprises an expansion module bus protocol controller and an expansion module bus protocol generator, and the specific implementation method comprises the following steps:

the method comprises the following steps: the expansion module bus protocol controller starts from a certain protocol according to a certain sequence, and the expansion module bus protocol generator communicates with the expansion module through an expansion module bus interface according to the protocol to confirm the handshake;

step two: if a certain bus protocol succeeds in n-time handshaking, the expansion module connected behind the CPU can be confirmed to be the bus protocol and carry out normal communication operation according to the protocol;

step three: if a certain protocol is unsuccessful after n times of handshaking, the expansion bus protocol controller will switch to another bus protocol to perform handshaking, and repeat the process of the second step until all the bus protocols are completed.

2. The method of claim 1, wherein the extension module of the CPU of the PLC comprises a plurality of bus protocol self-adaptive methods, wherein the bus protocol self-adaptive methods comprise: the expansion module bus protocol generator comprises two or more types of expansion bus protocols.

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