Instrument communication system based on HART protocol

Abstract

The utility model relates to an instrument communication system based on an HART protocol, which belongs to the technical field of chemical engineering automatic control and comprises a CPU, a plurality of single-channel analog quantity isolation gates, a plurality of HART AI acquisition modules and a power supply module for supplying power to the whole system. The output end of the analog quantity acquisition instrument is connected to the input end of the single-channel analog quantity isolation gate, and the output end of the single-channel analog quantity isolation gate is connected to the CPU through the corresponding HART AI acquisition module; by skillfully combining a 4-20mA signal acquisition instrument with the HART communication technology, the purpose that instantaneous quantity signals are acquired on the same AI channel and additional quantity and cumulant signals are acquired through HART communication is achieved. By means of the design, the efficiency and flexibility of data collection are greatly improved, and the requirements for high-precision and multivariable data in modern industrial production are met.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical automatic control, and in particular relates to an instrument communication system based on the HART protocol. Background Art

[0002] Modern industrial production, especially in high-tech fields like pressure vessel manufacturing, places ever-stricter demands on production process monitoring and data collection. Precise control and recording of various process parameters are crucial in pressure vessel manufacturing. This involves numerous instruments with cumulative metering functions, such as mass flowmeters. These instruments not only require real-time feedback on basic information like instantaneous flow and quality, but also require the ability to continuously accumulate and transmit these cumulative values, as well as multivariate data such as density, temperature, and concentration. While stable, traditional 4-20mA analog signal transmission methods are limited by their single-channel nature, making them inadequate for simultaneous transmission of multivariable instruments. Furthermore, wiring complexity and maintenance costs are high. While RS485 RTU communication networks enable multivariable data transmission, their hand-in-hand connection structure is prone to disconnections and communication interruptions in complex industrial environments, resulting in data loss and severely impacting the continuity and stability of production lines. As production scale expands and the variety of instruments increases, RS485 RTU networks face complex wiring and commissioning challenges when adding new equipment, as well as high troubleshooting and maintenance costs. Utility Model Content

[0003] The purpose of this utility model is to provide a HART protocol-based instrument communication system to solve the problems in the prior art.

[0004] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0005] An instrument communication system based on the HART protocol, including a CPU, several single-channel analog isolation barriers, several HART AI acquisition modules and a power module for powering the entire system;

[0006] The output end of the analog acquisition instrument is connected to the input end of the single-channel analog isolation barrier, and the output end of the single-channel analog isolation barrier is connected to the CPU through the corresponding HART AI acquisition module.

[0007] A further improvement of the present technical solution is that the analog quantity acquisition instrument includes a four-wire analog quantity acquisition instrument and / or a two-wire analog quantity acquisition instrument, the two-wire analog quantity acquisition instrument is a passive instrument, the two-wire analog quantity acquisition instrument is directly connected to the input end of the corresponding single-channel analog quantity isolation barrier, the power supply end of the four-wire analog quantity acquisition instrument is connected to the power supply module, and the output end of the four-wire analog quantity acquisition instrument is connected to the input end of the corresponding single-channel analog quantity isolation barrier.

[0008] A further improvement of the technical solution is that the power module includes an uninterruptible power supply UPS1, a circuit breaker QF1, a circuit breaker QF2, an AC / DC power converter PWO1, an AC / DC power converter PWO2, a STIOP power supply and a circuit breaker QF3;

[0009] The input of AC / DC power converter PWO1 is connected to uninterruptible power supply UPS1 through circuit breaker QF1. The input of AC / DC power converter PWO2 is connected to uninterruptible power supply UPS1 through circuit breaker QF2. The 24V positive output of AC / DC power converter PWO1 is connected to the first input pin of the STIOP power supply. The 24V positive output of AC / DC power converter PWO2 is connected to the second input pin of the STIOP power supply. The 24V negative output of AC / DC power converter PWO1 and the 24V negative output of AC / DC power converter PWO2 are both connected to the ground of the STIOP power supply. The four-wire analog acquisition instrument, single-channel analog isolation barrier, and HART AI acquisition module are all connected to the output and ground of the STIOP power supply through circuit breaker QF3.

[0010] Further improvements of the technical solution include several instrument circuit breakers, several isolation barrier circuit breakers and several AI module circuit breakers. The power supply end of each four-wire analog acquisition instrument is connected to the output end of the circuit breaker QF3 through a corresponding instrument circuit breaker, the power supply end of each HART AI acquisition module is connected to the output end of the circuit breaker QF3 through a corresponding AI module circuit breaker, and the power supply ends of all single-channel analog isolation barriers are connected to the output end of the circuit breaker QF3 through the isolation barrier circuit breaker.

[0011] A further improvement of this technical solution is that the HART AI acquisition module adopts a HART AI acquisition module of Siemens ET200SP.

[0012] A further improvement of this technical solution is that the single-channel analog isolation barrier adopts a one-input and one-output analog signal isolator of the Weidmuller WAVE series.

[0013] The beneficial effects of the present invention are:

[0014] Efficient Data Integration and Acquisition: By cleverly combining 4-20mA signal acquisition instruments with HART communication technology, this system can collect both instantaneous signals (such as flow and mass) on the same AI channel and obtain additional and cumulative signals (such as density, temperature, and concentration accumulation) through HART communication. This design greatly improves the efficiency and flexibility of data acquisition and meets the demand for high-precision, multivariable data in modern industrial production.

[0015] Cost Optimization and Resource Conservation: Compared to traditional communication systems that require multiple independent modules to collect different types of data, this system can complete the collection of multiple data types through a single AI channel, significantly reducing hardware costs and maintenance complexity. It also reduces the wiring complexity and failure points caused by the increase in modules, effectively conserving resources.

[0016] Flexible scalability and compatibility: The system was designed with future expansion in mind. Its modular design makes adding new instruments and devices simple and quick. It also supports the integration of four-wire and two-wire analog acquisition instruments, enhancing compatibility with existing equipment and reducing the cost and entry point for system upgrades.

[0017] Improved system security and reliability: An integrated uninterruptible power supply (UPS) and multiple protection mechanisms (such as circuit breakers and AC / DC converters) ensure stable system operation even in the event of a main power failure or emergency, effectively preventing data loss and system crashes caused by power issues. Furthermore, the power module design incorporates redundancy and backup, further enhancing overall system reliability and security.

[0018] In addition, the utility model has a reliable design principle, a simple structure and a very broad application prospect.

[0019] It can be seen that compared with the prior art, the present invention has outstanding substantial features and significant progress, and the beneficial effects of its implementation are also obvious. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a connection diagram of the instrument communication system.

[0021] Figure 2 This is the communication diagram of the instrument communication system.

[0022] Figure 3 This is a connection diagram of the power module.

[0023] 110 is the CPU, 120 is the single-channel analog isolation barrier, and 130 is the HART AI acquisition module. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the following will be combined with the drawings of the embodiments of the present invention to clearly and completely describe the technical solutions of the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0026] The key terms appearing in this utility model are explained below.

[0027] The CPU, or Central Processing Unit, is one of the main components of a computer and its core component. Its primary function is to interpret computer instructions and process data from software. The CPU is the core component responsible for reading, decoding, and executing instructions. The CPU comprises arithmetic logic, registers, an arithmetic unit, and control components.

[0028] like Figure 1 、 Figure 2 and Figure 3 As shown, the utility model provides an instrument communication system based on the HART protocol, including a CPU, several single-channel analog isolators, several HART AI acquisition modules, and a power supply module for powering the entire system; the output end of the analog acquisition instrument is connected to the input end of the single-channel analog isolator, and the output end of the single-channel analog isolator is connected to the CPU through the corresponding HART AI acquisition module; wherein the HART AI acquisition module adopts the HART AI acquisition module of the Siemens ET200SP model; the single-channel analog isolator adopts the Weidmuller WAVE series one-input and one-output analog signal isolator. Specifically, the input end of each single-channel analog isolator is connected to an analog acquisition instrument, the output end of the single-channel analog isolator is connected to the CPU through the HART AI acquisition module, and each HART AI acquisition module is connected to four single-channel analog isolators.

[0029] Among them, the analog quantity acquisition instrument includes a four-wire analog quantity acquisition instrument and / or a two-wire analog quantity acquisition instrument. The two-wire analog quantity acquisition instrument is a passive instrument. The two-wire analog quantity acquisition instrument is directly connected to the input end of the corresponding single-channel analog quantity isolation barrier. The power supply end of the four-wire analog quantity acquisition instrument is connected to the power supply module, and the output end of the four-wire analog quantity acquisition instrument is connected to the input end of the corresponding single-channel analog quantity isolation barrier.

[0030] Specifically, the power module includes an uninterruptible power supply UPS1, a circuit breaker QF1, a circuit breaker QF2, an AC / DC power converter PWO1, an AC / DC power converter PWO2, an STIOP power supply and a circuit breaker QF3; the input end of the AC / DC power converter PWO1 is connected to the uninterruptible power supply UPS1 through the circuit breaker QF1, the input end of the AC / DC power converter PWO2 is connected to the uninterruptible power supply UPS1 through the circuit breaker QF2, the 24V positive output end of the AC / DC power converter PWO1 is connected to the first input pin of the STIOP power supply, the 24V positive output end of the AC / DC power converter PWO2 is connected to the second input pin of the STIOP power supply, the 24V negative output end of the AC / DC power converter PWO1 and the 24V negative output end of the AC / DC power converter PWO2 are both connected to the ground end of the STIOP power supply, and the four-wire analog acquisition instrument, the single-channel analog isolation barrier and the HART AI acquisition module are all connected to the output end and the ground end of the STIOP power supply through the circuit breaker QF3. The AC / DC power converter PWO1 and the AC / DC power converter PWO2 are both used to convert the AC power provided by the uninterruptible power supply UPS1 into 24V DC power.

[0031] In addition, the instrument communication system also includes several instrument circuit breakers, several isolation barrier circuit breakers and several AI module circuit breakers. The power supply end of each four-wire analog acquisition instrument is connected to the output end of circuit breaker QF3 through a corresponding instrument circuit breaker. The power supply end of each HART AI acquisition module is connected to the output end of circuit breaker QF3 through a corresponding AI module circuit breaker. The power supply end of all single-channel analog isolation barriers is connected to the output end of circuit breaker QF3 through isolation barrier circuit breakers.

[0032] Specifically, the four-wire analog quantity acquisition instrument includes a mass flowmeter, which can be used to measure feed flow and finished product flow; the two-wire analog quantity acquisition instrument includes a vortex flowmeter, which is used to measure steam flow. The variables that need to be collected during the pressure vessel manufacturing process include feed mass flow, feed cumulative amount, finished product mass flow, finished product cumulative amount, finished product temperature, steam mass flow, and steam cumulative amount. Among them, the feed mass flow, finished product mass flow and steam mass flow are transmitted through 4-20mA, and the feed cumulative amount, finished product cumulative amount, finished product temperature and steam cumulative amount are transmitted through HART communication. In the present invention, when a four-wire analog acquisition instrument (L01, L02) is connected to a single-channel analog isolation barrier, a separate power supply circuit is provided and a four-core cable is used for connection, wherein a two-core cable is used to provide power and the other two-core cable is used to transmit a 4-20mA signal, which is an active signal. When a two-wire analog acquisition instrument (L03) is connected to a single-channel analog isolation barrier, a two-core cable is used for connection, which simultaneously provides power and transmits a 4-20mA signal, which is a passive signal. After passing through the single-channel analog isolation barrier, the signals are uniformly converted into active 4-20mA signals and enter the HART AI acquisition module. PV, SV, TV, and DV variables can also be collected through the HART communication protocol (the values of the PV, SV, TV, and DV variables are set according to requirements), and transient signals are collected and transmitted to the CPU.

[0033] In addition, the instrument communication system also includes a PLC configuration module, which is connected to the CPU. The PLC configuration module is used to configure the HART variable attributes of the analog acquisition instrument and the HART variable attributes of the HART AI acquisition module. The variable configuration table of the analog acquisition instrument is shown in Table 1 below, and the variable configuration table of the HART AI acquisition module is shown in Table 2 below:

[0034] Table 1: Variable configuration table of analog acquisition instrument

[0035] Dynamic variables L01 L02 L03 PV Mass flow Mass flow Mass flow SV Accumulator 1 Accumulator 1 temperature TV concentration density Accumulator 1 QV temperature temperature pressure ;

[0036] Table 2: Variable configuration table of HART AI acquisition module

[0037] HART variables L01 L02 L03 Variable 0 Channel 0SV Variable 1 Channel 1SV Variable 2 Channel 1QV Variable 3 Channel 2 TV .

[0038] The above disclosure is only a preferred embodiment of the present invention, but the present invention is not limited thereto. Any non-creative changes that can be thought of by technicians in this field, as well as several improvements and modifications made without departing from the principles of the present invention, should fall within the scope of protection of the present invention.

Claims

1. An instrument communication system based on the HART protocol, characterized in that: Includes a CPU, several single-channel analog isolation barriers, several HART AI acquisition modules, and a power supply module for the entire system; The output end of the analog acquisition instrument is connected to the input end of the single-channel analog isolation barrier, and the output end of the single-channel analog isolation barrier is connected to the CPU through the corresponding HART AI acquisition module.

2. The instrument communication system based on the HART protocol according to claim 1, characterized in that: The analog quantity acquisition instrument includes a four-wire analog quantity acquisition instrument and / or a two-wire analog quantity acquisition instrument. The two-wire analog quantity acquisition instrument is a passive instrument. The two-wire analog quantity acquisition instrument is directly connected to the input end of the corresponding single-channel analog quantity isolation barrier. The power supply end of the four-wire analog quantity acquisition instrument is connected to the power supply module, and the output end of the four-wire analog quantity acquisition instrument is connected to the input end of the corresponding single-channel analog quantity isolation barrier.

3. The instrument communication system based on the HART protocol according to claim 2, characterized in that: The power supply module includes an uninterruptible power supply UPS1, a circuit breaker QF1, a circuit breaker QF2, an AC / DC power converter PWO1, an AC / DC power converter PWO2, a STIOP power supply and a circuit breaker QF3; The input of AC / DC power converter PWO1 is connected to uninterruptible power supply UPS1 through circuit breaker QF1. The input of AC / DC power converter PWO2 is connected to uninterruptible power supply UPS1 through circuit breaker QF2. The 24V positive output of AC / DC power converter PWO1 is connected to the first input pin of the STIOP power supply. The 24V positive output of AC / DC power converter PWO2 is connected to the second input pin of the STIOP power supply. The 24V negative output of AC / DC power converter PWO1 and the 24V negative output of AC / DC power converter PWO2 are both connected to the ground of the STIOP power supply. The four-wire analog acquisition instrument, single-channel analog isolation barrier, and HART AI acquisition module are all connected to the output and ground of the STIOP power supply through circuit breaker QF3.

4. The instrument communication system based on the HART protocol according to claim 3, characterized in that: It also includes several instrument circuit breakers, several isolation barrier circuit breakers and several AI module circuit breakers. The power supply end of each four-wire analog acquisition instrument is connected to the output end of circuit breaker QF3 through a corresponding instrument circuit breaker, the power supply end of each HART AI acquisition module is connected to the output end of circuit breaker QF3 through a corresponding AI module circuit breaker, and the power supply ends of all single-channel analog isolation barriers are connected to the output end of circuit breaker QF3 through isolation barrier circuit breakers.

5. The instrument communication system based on the HART protocol according to claim 1, characterized in that: The HART AI acquisition module uses the HART AI acquisition module of Siemens ET200SP.

6. The instrument communication system based on the HART protocol according to claim 1, characterized in that: The single-channel analog isolation barrier uses a Weidmuller WAVE series one-input and one-output analog signal isolator.

Images