CN210867650U - Combined functional module for integrated acquisition of analog and digital quantity signals and acquisition system - Google Patents

Abstract

The utility model relates to a combined functional module and an acquisition system for integrated acquisition of analog and digital signals, wherein the combined functional module comprises an analog acquisition unit, the input end of which is directly connected with a sensor and is used for acquiring analog signals from the sensor without a PLC (programmable logic controller); the input end of the digital quantity acquisition unit is directly connected with the sensor and is used for acquiring a digital quantity signal from the sensor without the PLC; the CPU unit is coupled with the output end of the digital quantity acquisition unit at the digital quantity input end and is used for processing and forwarding the received analog quantity signal and the received digital quantity signal; the RS485 bus communication unit is connected with the CPU unit and is used for sending data to the data receiving device; and the Ethernet communication unit is connected with the CPU unit and is used for sending the data to the data receiving device. The utility model discloses a combined function module arranges in the sensor side nearby, gathers analog quantity and digital quantity signal simultaneously, and has unified bus communication port, and the on-the-spot wiring is convenient, construction cost is lower in the implementation process.

Description

Combined functional module for integrated acquisition of analog and digital quantity signals and acquisition system

Technical Field

The utility model belongs to the technical field of the technique of industrial control device and specifically relates to a with analog, digital signal integrated collection's combined function module and collection system.

Background

Under the large background of promoting the development of the industrial Internet of things technology, realizing the upgrading of the production and manufacturing industry and realizing intelligent manufacturing, a plurality of enterprises are in the tide of the industrial Internet of things. To realize intelligent manufacturing in an industrial field, data acquisition is performed in a bottommost ring, and for an occasion where analog quantity signals and digital quantity signals need to be acquired simultaneously, a common practice at present is to use a combination of a multi-channel analog quantity module and a multi-channel digital quantity module. The existing commonly used acquisition module of the acquisition mode is generally arranged in a communication cabinet or an acquisition substation on site, when data communication is carried out, an analog quantity module and a digital quantity module are connected with sensors through signal lines, each signal line at least selects a shielding line with 4 cores and 0.3 square, because the sensors in a factory are more in quantity and wider in distribution, some sensors are far away from the communication cabinet or the acquisition substation, and some sensors are tens of meters or even hundreds of meters, then, the required wiring quantity of each sensor which is accessed into the analog quantity module and the digital quantity module in the communication cabinet or the acquisition substation through the signal lines is huge, and moreover, a power supply is required to be arranged on the modules, and in the implementation process, the material cost and the construction cost are very high, and the difficulty is large.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a with the integrated combination function module who gathers of simulation, digital quantity signal, can arrange in the sensor side, gather analog quantity and digital quantity signal simultaneously, have bus communication function, the wiring is convenient in the implementation process, construction cost is lower.

The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme: a combined function module for integrated acquisition of analog and digital signals, comprising: the input end of the analog quantity acquisition unit is directly connected with the sensor and is used for acquiring an analog quantity signal from the sensor without a PLC (programmable logic controller); the input end of the digital quantity acquisition unit is directly connected with the sensor and is used for acquiring a digital quantity signal from the sensor without a PLC (programmable logic controller); the CPU unit is coupled with the output end of the digital quantity acquisition unit at the digital quantity input end and is used for processing and forwarding the received analog quantity signal and the received digital quantity signal; the RS485 bus communication unit is connected with the CPU unit and is used for sending data to the data receiving device; and the Ethernet communication unit is connected with the CPU unit and is used for sending the data to the data receiving device.

Through adopting above-mentioned technical scheme, it is integrated with analog quantity and digital quantity signal acquisition function, and unified communication port has, can solve the problem that industrial production scene analog quantity and digital quantity gathered simultaneously, this combination function module can direct mount in the sensor side, and every sensor all corresponds a combination function module, thereby can bypass PLC, directly gather analog quantity signal or digital quantity signal from the sensor, compare in traditional placing collection module in the communication cabinet or gathering the sub-station, this combination function module only needs a bus, alright realize the communication with all sensors, the objective problem that has overcome the industrial scene and exists, it is convenient to lay wire in the implementation, construction cost is lower.

The present invention may be further configured in a preferred embodiment as: the CPU unit is a 32-bit microcontroller based on ARM.

The present invention may be further configured in a preferred embodiment as: the analog quantity acquisition unit comprises a first analog quantity signal acquisition circuit and a second analog quantity signal acquisition circuit, the first analog quantity signal acquisition circuit and the second analog quantity signal acquisition circuit both comprise a differential operational amplifier circuit and a proportional amplification circuit, the differential operational amplifier circuit is used for converting differential signals into common-ground signals, and the proportional amplification circuit is used for adjusting analog quantity signals sent to the CPU circuit.

The present invention may be further configured in a preferred embodiment as: the analog quantity acquisition unit comprises an analog quantity signal acquisition circuit of any one or a combination of any two or more than two of 4-20mA, 0-20mA, +/-10 mA, 0-20mV, 0-75mV, 0-5V, 0-10V, +/-50 mV, +/-100 mV and +/-5V.

The present invention may be further configured in a preferred embodiment as: the digital quantity acquisition unit comprises an acquisition circuit supporting digital quantity signals of 20kHz and below.

The present invention may be further configured in a preferred embodiment as: the circuit of the RS485 bus communication unit comprises an ADM2483 isolation type RS485 transceiver.

By adopting the technical scheme, the ADM2483 chip is an isolated RS485 transceiver, a magnetic coupling isolation technology is integrated inside, and the ADM2483 chip has the advantages of small size, power supply monitoring function, suitability for bidirectional data communication of a multi-point bus transmission line and high common-mode transient interference resistance.

The present invention may be further configured in a preferred embodiment as: the circuit of the RS485 bus communication unit also comprises a B0505LM-1 series DC/DC converter which is used for realizing the isolation of 1000VDC between the input and the output.

By adopting the technical scheme, B0505LM-1W series products are ultra-small and high-reliability DC/DC converters isolating 1000VDC, and the interference of high-frequency transient burst waves can be well resisted due to the fact that the isolation of 1000VDC between input and output is achieved, and the output short-circuit time can last for 1 s.

The second purpose of the utility model is to provide an acquisition system, can gather analog quantity and digital quantity signal simultaneously, have bus communication function, wiring convenience, construction cost are lower in the implementation.

The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme: an acquisition system comprises a plurality of sensors distributed at different positions on site; a data receiving device; the combined function module integrates and collects analog and digital quantity signals; the input ends of the analog quantity acquisition unit and the digital quantity acquisition unit are directly connected with the sensors to acquire corresponding analog quantity signals or digital quantity signals; the CPU unit is connected with the data receiving device through an RS485 bus communication unit or an Ethernet communication unit.

Through adopting above-mentioned technical scheme, every sensor corresponds a combined function module of installation, and combined function module installs in the sensor side, realize with the communication of RS485 bus through the RS485 bus communication unit of each combined function module, compare in traditional placing collection module in the communication cabinet or gathering the sub-station, this combined function module only needs a bus, alright with realize the communication with all sensors, overcome the objective problem that the industrial field exists, the wiring is convenient in the implementation, construction cost is lower.

The present invention may be further configured in a preferred embodiment as: the data receiving device comprises a front server, and the CPU unit is in communication connection with the front server through an RS485 bus communication unit or an Ethernet communication unit.

To sum up, the utility model discloses a following useful technological effect at least:

the combined function module of the utility model integrates the analog quantity and digital quantity signal acquisition functions and has a unified communication port, which can solve the problem of simultaneously acquiring analog quantity and digital quantity in the industrial production field; the combined function module can be directly installed on the side of the sensor, each sensor corresponds to one combined function module, and each combined function module realizes communication through one bus, so that the problems of large wiring amount and difficult construction caused by large quantity and wide distribution of industrial field sensors are solved, and the material cost and the construction cost are reduced.

Drawings

Fig. 1 is an exemplary block diagram of a combined function module for integrated acquisition of analog and digital signals according to an embodiment of the present invention.

Fig. 2 is a circuit diagram of an analog quantity acquisition unit according to an embodiment of the present invention.

Fig. 3 is a circuit diagram of a digital value acquisition unit according to an embodiment of the present invention.

Fig. 4 is a circuit diagram of a CPU unit according to an embodiment of the present invention.

Fig. 5 is a circuit diagram of an ethernet communication according to an embodiment of the present invention.

Fig. 6 is a circuit diagram of RS485 bus communication according to an embodiment of the present invention.

Fig. 7 is a circuit diagram of a switching power supply according to an embodiment of the present invention.

Fig. 8 is a power protection circuit diagram according to an embodiment of the present invention.

Fig. 9 is an exemplary connection block diagram of a sensor and combination module according to an embodiment of the present invention.

Fig. 10 is a system block diagram of an acquisition system according to an embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings, wherein circuit components and their mutual connection relationships will be understood by those skilled in the art even if they are not described in detail, and the contents described in the present embodiment will be obtained from the detailed circuit diagrams provided in the drawings.

Fig. 1 is an exemplary block diagram of a combined function module (hereinafter, referred to as a combined function module) for integrated collection of analog and digital signals according to an embodiment of the present invention, and referring to fig. 1, the combined function module includes an analog quantity collection unit, a digital quantity collection unit, a CPU unit, an RS485 bus communication unit, an ethernet communication unit, a switching power supply unit, and a power protection unit. The input end of the analog quantity acquisition unit is directly connected with the sensor, the input end of the digital quantity acquisition unit is directly connected with the sensor, and the analog quantity acquisition unit and the digital quantity acquisition unit are both used for acquiring analog quantity signals from the sensor without a PLC (programmable logic controller); the output end of the analog quantity acquisition unit is connected with the analog quantity input end of the CPU unit, the output end of the digital quantity acquisition unit is connected with the digital quantity input end of the CPU unit, and the CPU unit is used for processing acquired analog quantity signals and uploading and forwarding data; the processing and uploading forwarding are to convert the analog quantity and the digital quantity into communication form; the RS485 bus communication unit is connected with the CPU unit and is used for sending the acquired data to the data receiving device; and the Ethernet communication unit is connected with the CPU unit and is used for sending the acquired data to the data receiving device.

Fig. 2 is a circuit diagram of an analog quantity acquisition unit according to an embodiment of the present invention, referring to fig. 2, the analog quantity acquisition unit includes an acquisition circuit of 0-10V analog quantity signal, the acquisition circuit of 0-10V analog quantity signal has a positive input end EXT I1+ and a negative input end EXT T1-connected to the sensor, and an output end; the acquisition circuit mainly comprises a differential operational amplifier circuit and a proportional amplification circuit, wherein a sensor signal enters and flows through a first chip LM224AD which is a differential operational amplifier and is used for converting a differential signal into a signal on common ground, then passes through a second chip MCP6002 which is a proportional amplifier formed by the operational amplifier, and is adjusted to be an analog signal of a single chip microcomputer by adjusting a potentiometer P1; the function of D2 is mainly differential pressure protection. The acquisition circuit of the analog quantity signal is not limited to one of 0-10V, and any one of 4-20mA, 0-20mA, +/-10 mA, 0-20mV, 0-75mV, 0-5V, 0-10V, +/-50 mV, +/-100 mV and +/-5V or the combination of any two or more than two can be integrated according to the sensor and the field configuration. The analog quantity acquisition unit is an independent acquisition circuit, is not a PLC (programmable logic controller) and an acquisition circuit associated with the PLC, and independently acquires analog quantity signals and sends the analog quantity signals to the CPU. The analog signal acquisition circuit is a traditional classical analog signal acquisition circuit, and a person skilled in the art can understand the principle of the traditional classical analog signal acquisition circuit, so that redundant description is omitted.

Fig. 3 is the circuit diagram of the digital quantity acquisition unit of the embodiment of the utility model, refer to fig. 3, the digital quantity acquisition unit includes the acquisition circuit of many digital quantity signals, and the acquisition circuit of digital quantity signal can support the acquisition of digital quantity signal 20kHz and below, for example, the on-off quantity such as the status signal of circulating pump, the on-off state of business turn over storehouse valve on the production line. The digital quantity acquisition unit is an independent acquisition circuit, is not a PLC and an acquisition circuit associated with the PLC, and independently acquires digital quantity signals and sends the digital quantity signals to the CPU. The acquisition circuit of the digital quantity signal is provided with input ends IO _24v, HSI1, HSI2 and the like and output ends, wherein HSI1 and HSI2 are anti-reverse ends. A chip T1 with the IC model of HCPL-0600 is adopted in an acquisition circuit of a digital quantity signal, is a photoelectric coupling gate circuit chip and combines a phosphorus gallium arsenide light emitting diode and an integrated high-gain photodetector. The output of the detector IC is an open collector schottky clamp transistor. The internal shielding of HCPL-0600 can ensure that the common-mode transient immunity reaches 15000V/mus under the condition of Vcm = 1000V. This unique design provides maximum ac and dc circuit isolation while achieving TTL compatibility. The operating parameters of the HCPL-0600 optical coupler ensure that the temperature range is-40 ℃ to +85 ℃, and the parameters allow undisturbed operation of the system.

Fig. 4 is a circuit diagram of the CPU unit according to the embodiment of the present invention, referring to fig. 4, the CPU unit includes an ARM-based 32-bit microcontroller U2, and the microcontroller U2 mainly processes the acquired analog quantity signal and digital quantity signal into a communicable form. Microcontroller U2 may select the model number STM32F103V8T chip in one example. An analog quantity input pin of the STM32F103V8T chip is connected with an output end AIN1 of an analog quantity signal acquisition circuit; and a digital quantity input pin of the STM32F103V8T chip is connected with output ends HDI1, HDI2, HDI3 and HDI4 of a digital quantity signal acquisition circuit.

Fig. 5 is an ethernet communication circuit diagram according to an embodiment of the present invention, referring to fig. 5, the ethernet communication unit is connected to the STM32F103V8T chip through a connector, the ethernet communication circuit included in the ethernet communication unit has an EU1RX terminal and an EU1TX terminal, the STM32F103V8T chip has a USART interface for connecting to the EU1RX terminal and the EU1TX terminal, the output terminal of the ethernet communication circuit adopts a communication socket RJ45 to access a data receiving device with the ethernet interface, such as a front server, so as to store the collected data in the front server; the Ethernet communication circuit can also communicate with the cloud server, and the acquired data is stored in the cloud server.

Fig. 6 is the RS485 bus communication circuit diagram of the embodiment of the present invention, referring to fig. 6, the RS485 bus communication unit includes the RS485 bus communication circuit, and the RS485 bus communication circuit includes the RS485 transceiver U6 and the DC/DC converter M7. In one example, the RS485 transceiver U6 may employ an ADM2483 chip, and the ADM2483 employs a magnetic coupling isolation technology, and functionally corresponds to integrating three single-channel optical couplers and one RS485 transceiver. The RXD and TXD pins of the AMD2483 chip are connected to the MD _ RXD terminal and the MD _ TXD terminal of the other channel of the STM32F103V8T chip. The ADM2483 chip has electro-optical isolation and high common mode transient immunity. The DC/DC converter M7 may adopt B0505LM-1W series products for achieving 1000VDC isolation between input and output, and the output short-circuit time may last 1S, thereby being well below the interference of high frequency transient bursts. The RS485 bus communication circuit can be connected with a front-end server and other related data storage devices, so that the acquired data can be stored in the front-end server.

Fig. 7 is the utility model discloses switching power supply circuit diagram, fig. 8 is the utility model discloses a power protection circuit diagram, refer to fig. 7 and fig. 8, switching power supply unit includes switching power supply circuit, and switching power supply circuit's output is connected with analog quantity acquisition circuit, digital quantity acquisition circuit, CPU circuit, RS485 bus communication circuit and ethernet communication circuit's VCC end respectively to provide the voltage of required grade for different circuits. The switching power supply circuit comprises a buck switching power supply chip M1, wherein the M1 can select LM2575T-5.0 chips, the switching power supply circuit further comprises a forward low-voltage regulator M2, the M2 can select an AMS1117-3.3 chip, the AMS1117-3.3 is a forward low-voltage-drop regulator with the output voltage of 3.3V, and the C128 and E7 are used for restraining self-oscillation. The power protection unit comprises a power protection circuit which is used for realizing the protection of undervoltage and the like of the switching power supply circuit.

The analog quantity acquisition unit, the digital quantity acquisition unit, the RS485 bus communication unit, the switching power supply unit and the power supply protection unit can be connected with the CPU unit through connectors, so that the functions of independent units are realized.

Fig. 9 is a block diagram illustrating exemplary connections between sensors and a combination module according to an embodiment of the present invention, fig. 10 is a system block diagram illustrating an acquisition system according to an embodiment of the present invention, and referring to fig. 9 and 10, an acquisition system includes a plurality of sensors distributed at different locations on site, a data receiving device, and the above-mentioned combination functional module for integrally acquiring analog and digital signals; the input ends of the analog quantity acquisition unit and the digital quantity acquisition unit are directly connected with the sensors to acquire corresponding analog quantity signals or digital quantity signals; the CPU unit is connected with the data receiving device through an RS485 bus communication unit or an Ethernet communication unit.

Specifically, the number of sensors on an industrial site is large, the distribution range is wide, some sensors are dozens of meters away from a communication cabinet or an acquisition substation, the distance is short and even hundreds of meters, and the traditional multi-channel analog quantity module and digital quantity module combined use mode can cause the problem that the number of signal cables consumed in the implementation process is huge, the material cost and the construction cost are high, and the difficulty is large.

Specifically, on a construction site, a combined function module is configured according to the actual situation of a field sensor, if the data of the field existing sensor is collected, whether the existing sensor has an idle channel or not is checked, and if the existing sensor has the idle channel, the combined function module is connected to the idle channel, so that the normal connection between the existing sensor and the PLC is not influenced; if the sensors are newly installed, a combined functional module is configured near each sensor, all the combined functional modules realize data communication with the data acquisition device through one RS485 bus, and a standard hand-in-hand wiring mode is preferably adopted. The data receiving device may include a front-end server and/or a cloud server.

The utility model discloses a combination function module is integrated and have unified bus communication port with analog quantity and digital quantity signal acquisition function, contains signal acquisition and bus communication function. Meanwhile, the combined functional module is different from a traditional multi-channel module, a single channel is adopted, each sensor is provided with one combined functional module, all sensors are connected through a bus, energy is saved, cost is saved, the combined functional modules can be installed on the sides of the sensors nearby, and the adopted signal wire is short in wiring, so that wiring is convenient in a construction site, and construction difficulty is reduced.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims (9)

1. A combined function module for integrated acquisition of analog and digital signals, comprising:

the input end of the analog quantity acquisition unit is directly connected with the sensor and is used for acquiring an analog quantity signal from the sensor without a PLC (programmable logic controller);

the input end of the digital quantity acquisition unit is directly connected with the sensor and is used for acquiring a digital quantity signal from the sensor without a PLC (programmable logic controller);

the CPU unit is coupled with the output end of the digital quantity acquisition unit at the digital quantity input end and is used for processing and forwarding the received analog quantity signal and the received digital quantity signal;

the RS485 bus communication unit is connected with the CPU unit and is used for sending data to the data receiving device; and

and the Ethernet communication unit is connected with the CPU unit and is used for transmitting the data to the data receiving device.

2. The combined functional module for integrated acquisition of analog and digital signals according to claim 1, wherein the CPU unit is an ARM-based 32-bit microcontroller.

3. The combined functional module for integrated collection of analog and digital signals according to claim 1, wherein the analog quantity collection unit comprises a first analog quantity signal collection circuit and a second analog quantity signal collection circuit, both of which comprise a differential operational amplifier circuit for converting a differential signal into a common ground signal and a proportional amplifier circuit for adjusting the analog quantity signal sent to the CPU circuit.

4. The combined functional module for integrated collection of analog and digital signals according to claim 3, wherein the analog signal collection unit comprises a circuit for collecting analog signals of any one or a combination of any two or more of 4-20mA, 0-20mA, 10mA, 0-20mV, 0-75mV, 0-5V, 0-10V, 50mV, 100mV, and 5V.

5. The combined functional module for integrated acquisition of analog and digital signals according to claim 1, wherein the digital acquisition unit comprises an acquisition circuit for digital signals supporting digital signals of 20kHz and below.

6. The combined functional module for integrated collection of analog and digital signals according to claim 1, wherein the circuit of the RS485 bus communication unit comprises an ADM2483 isolated RS485 transceiver.

7. The combined functional module for integrated collection of analog and digital signals according to claim 6, wherein the circuit of the RS485 bus communication unit further comprises a DC/DC converter of B0505LM-1 series for achieving 1000VDC isolation between input and output.

8. An acquisition system is characterized by comprising a plurality of sensors distributed at different positions on site;

a data receiving device; and

the combined functional module for integrated acquisition of analog and digital signals as claimed in any one of claims 1 to 7;

the input ends of the analog quantity acquisition unit and the digital quantity acquisition unit are directly connected with the sensors to acquire corresponding analog quantity signals or digital quantity signals; the CPU unit is connected with the data receiving device through an RS485 bus communication unit or an Ethernet communication unit.

9. The acquisition system of claim 8, wherein the data receiving device comprises a front server, and the CPU unit is communicatively connected to the front server via an RS485 bus communication unit or an ethernet communication unit.

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