A solenoid valve networking device based on a four-wire differential link

Abstract

This invention provides a solenoid valve networking device based on a four-wire differential link, relating to the field of industrial automation technology. It includes: a coupler, with the uplink side used for communication with a host control device and generating downlink object dictionaries and control data, and the downlink side used for communication with multiple solenoid valve nodes via the four-wire differential link; the four-wire differential link is used for communication between the multiple solenoid valve nodes; and multiple solenoid valve nodes, each including an independent microcontroller (MCU) and drive circuitry. This invention solves the problems of high cost and large size in existing solenoid valves.

Description

Technical Field

[0001] This utility model relates to the field of industrial automation technology, and in particular to a solenoid valve networking device based on a four-wire differential link. Background Technology

[0002] Existing solenoid valves are all based on a single circuit board with fixed point configurations such as 8, 16, and 32 points. It's difficult for general users to precisely configure the required number of points; sometimes adding even one point requires at least an additional 8-point solenoid valve drive module. This easily leads to cost waste and a large, space-consuming size. Utility Model Content

[0003] In order to overcome the shortcomings of the existing technology, the purpose of this utility model is to provide a solenoid valve networking device based on a four-wire differential link. This utility model solves the problems of high cost and large size of existing solenoid valves.

[0004] To achieve the above objectives, this utility model provides the following solution:

[0005] A solenoid valve networking device based on a four-wire differential link includes:

[0006] The coupler is used on the uplink side to communicate with the upper-level control device and generate the downlink object dictionary and control data, and on the downlink side to communicate with multiple solenoid valve nodes through a four-wire differential link.

[0007] The four-wire differential link is used for communication between the multiple solenoid valve nodes;

[0008] Multiple solenoid valve nodes, each of which includes an independent microcontroller (MCU) and drive circuitry.

[0009] Preferably, the four-wire differential link includes:

[0010] 24V power supply, ground, and differential communication lines VALink+ and VALink-.

[0011] Preferably, a single coupler can achieve any combination of expansions from 1 to 64 points.

[0012] A control method for a solenoid valve network based on a four-wire differential link includes:

[0013] S1 Configuration and Object Dictionary Generation: The coupler receives configuration and control commands from the upper control device and generates downlink object dictionary and control data;

[0014] S2 Link Establishment and Power Supply: VALink− is provided to the solenoid valve link through a four-wire differential link, and the first end of the link is connected to the first solenoid valve node;

[0015] S3 Frame Header Parsing and Local Matching: When any solenoid valve node receives a frame header, it identifies the local matching relationship and determines the current station number based on the frame header and its checksum.

[0016] S4 Station Number Increment and Fast Forwarding: While completing local matching, the solenoid valve node increments the station number of the frame header and forwards the updated frame header to the next node first, while continuing to receive and forward subsequent data.

[0017] S5 Local Verification and Execution: Performs redundant verification on locally related data packets; if the verification is correct, drives the local solenoid valve to perform an opening / closing action; continuously forwards non-local data.

[0018] S6 Abnormal State Handling: When frame verification, packet verification fails or link abnormality occurs, the system executes the security output locally according to the pre-configured policy, maintaining, setting high, or setting low.

[0019] S7 Expansion and Polling: Through the fast forwarding and parallel processing mechanism, time latency is reduced and on-demand expansion and low-latency polling are supported by any combination of 1–64 points.

[0020] The present invention discloses the following technical effects:

[0021] This invention provides a solenoid valve networking device based on a four-wire differential link, comprising: a coupler, the uplink side for communicating with a host control device and generating a downlink object dictionary and control data, and the downlink side for communicating with multiple solenoid valve nodes via the four-wire differential link; the four-wire differential link for communicating with the multiple solenoid valve nodes; and multiple solenoid valve nodes, each including an independent microcontroller (MCU) and drive circuit. This invention solves the problem of wasted solenoid valve points and increased costs caused by users, and supports arbitrary combinations of 1 to 64 points, allowing the use of various types of couplers and facilitating distributed remote expansion. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A detailed schematic diagram of a solenoid valve networking device based on a four-wire differential link, provided for an embodiment of this utility model. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] like Figure 1 As shown, this utility model provides a solenoid valve networking device based on a four-wire differential link, comprising:

[0027] The coupler is used on the uplink side to communicate with the upper-level control device and generate the downlink object dictionary and control data, and on the downlink side to communicate with multiple solenoid valve nodes through a four-wire differential link.

[0028] The four-wire differential link is used for communication between the multiple solenoid valve nodes;

[0029] Multiple solenoid valve nodes, each of which includes an independent microcontroller (MCU) and drive circuitry.

[0030] Preferably, the four-wire differential link includes:

[0031] 24V power supply, ground, and differential communication lines VALink+ and VALink-.

[0032] Preferably, a single coupler can achieve any combination of expansions from 1 to 64 points.

[0033] Specifically, VALink is a protocol for data communication between the coupler and solenoid valves 1, 2...N.

[0034] Solenoid valves 1, 2...N are connected to a 24V power supply, ground, and differential communication lines VALink+ and VALink- by adding a circuit board to the pins on the solenoid valve.

[0035] This invention employs differential data lines for communication, increasing anti-interference capabilities. The VALink communication protocol utilizes CRC redundancy check, enhancing communication reliability. Differential data lines can also increase the communication distance between solenoid valves (up to 100 meters).

[0036] In terms of working principle, the coupler has a hardware-configured object dictionary. When the PLC is configured, the coupler configures the communication content according to the upper-level configuration. The VALink protocol packages the data according to the upper-level configuration content, thereby achieving the function of controlling the on / off switching of each solenoid valve.

[0037] This embodiment also provides a control method for a solenoid valve network based on a four-wire differential link, the control method comprising:

[0038] S1 Configuration and Object Dictionary Generation: The coupler receives configuration and control commands from the upper control device and generates downlink object dictionary and control data;

[0039] S2 Link Establishment and Power Supply: VALink− is provided to the solenoid valve link through a four-wire differential link, and the first end of the link is connected to the first solenoid valve node;

[0040] S3 Frame Header Parsing and Local Matching: When any solenoid valve node receives a frame header, it identifies the local matching relationship and determines the current station number based on the frame header and its checksum.

[0041] S4 Station Number Increment and Fast Forwarding: While completing local matching, the solenoid valve node increments the station number of the frame header and forwards the updated frame header to the next node first, while continuing to receive and forward subsequent data.

[0042] S5 Local Verification and Execution: Performs redundant verification on locally related data packets; if the verification is correct, drives the local solenoid valve to perform an opening / closing action; continuously forwards non-local data.

[0043] S6 Abnormal State Handling: When frame verification, packet verification fails or link abnormality occurs, the system executes the security output locally according to the pre-configured policy, maintaining, setting high, or setting low.

[0044] S7 Expansion and Polling: Through the fast forwarding and parallel processing mechanism, time latency is reduced and on-demand expansion and low-latency polling are supported by any combination of 1–64 points.

[0045] Specifically, the coupler has two sets of outputs, each providing a maximum output current of 3A. Four wires—24V, GND, VALink+, and VALink-—are output from the coupler and connected to the processor on the first solenoid valve. The processor employs an automatic addressing and fast data forwarding mechanism. When one of the solenoid valve processors receives a data frame header, it can identify the current address and perform a frame header check. After decoding the frame header data, the processor increments the current station number address, performs verification, and forwards it to the next station. Simultaneously, it continues to receive data packet content and perform data packet verification. If the data is correct, it extracts the data packet and drives the current solenoid valve according to the configuration data. Data packets are continuously sent to the next station, achieving low latency to the next solenoid valve processor. The total communication latency is the sum of the latency of each valve receiving the frame header and the latency of the data packet. Assuming that each data frame originally consists of 128 bits, and the time for each packet to be received and sent is Ts, the time required for N solenoid valves to receive all the data is 2*N*Ts. This design assumes that the frame header plus frame header checksum is 32 bits, and that there is only a delay of Tr / 4. The time for N solenoid valves to process the data is (0.25*N+1)*Ts, which can greatly improve the transmission speed. Furthermore, the more solenoid valves added later, the faster the communication speed will be. Currently, this scheme can achieve a polling cycle of 2ms for 32 solenoid valves.

[0046] Exception handling mechanism: If data verification fails, the output status during abnormal communication can be configured through software.

[0047] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0048] This document uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. Furthermore, those skilled in the art will recognize that, based on the ideas of this utility model, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A solenoid valve networking device based on a four-wire differential link, characterized by, Comprise: A coupler, the uplink side is used for communication with the upper control device and generates the downlink object dictionary and control data, the downlink side is used for communication with a plurality of solenoid valve nodes through a four-wire differential link; The four-wire differential link is used for communication with the plurality of solenoid valve nodes; A plurality of solenoid valve nodes, each solenoid valve node comprises an independent microcontroller MCU and a driving circuit.

2. The electromagnetic valve networking device based on four-wire differential link according to claim 1, characterized in that, The four-wire differential link comprises: A 24V power supply, a ground and differential communication lines VALink+, VALink-.

3. The electromagnetic valve networking device based on four-wire differential link according to claim 1, characterized in that, A single coupler can realize 1-64 point arbitrary combination expansion.

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