CN110707678A - Double-line process device - Google Patents

Abstract

The invention ensures the current consumed by the communication between the master machine and the slave machine without sacrificing the consumed current at other places. The master machine is provided with a master machine main circuit and a master machine auxiliary circuit. The sub machine is provided with a sub machine main circuit and a sub machine auxiliary circuit. The master-slave circuit is provided with a parallel regulator, and generates a power supply voltage to the master-slave power supply circuit that supplies the power supply voltage to the communication driver, using a current that is used in the master main circuit and returned to the two-wire transmission path via the current detection resistor. The slave unit sub-circuit is provided with a parallel regulator, and generates a power supply voltage to the slave unit sub-power supply circuit that supplies the power supply voltage to the communication driver, using a current that is used in the slave unit main circuit and returned to the two-wire transmission path via the current detection resistor.

Description

Two-line process unit

technical field

The present invention relates to a two-wire process apparatus including a power supply circuit that generates a power supply voltage from a current supplied via a two-wire transmission path and a current control circuit that controls current flowing to the transmission path.

Background technique

Conventionally, as a device for monitoring and controlling the operation of an industrial process, a two-wire process device is used. The two-wire process device includes a power supply circuit and a current control circuit. The power supply circuit is supplied via a two-wire transmission path. The current control circuit controls the magnitude of the current flowing to the transmission path according to the process state and the like to generate the power supply voltage.

FIG. 5 shows an example of a two-line process apparatus composed of a master machine and a slave machine (for example, see Patent Document 1). The two-line process apparatus 200 has a configuration including a parent machine 3 and a slave machine 4 .

The main machine 3 includes a CPU (Central Processing Unit) 3_1 and a current control circuit 3_2. The slave 4 includes a CPU 4_1, an A/D converter 4_2, and a sensor 4_3.

In the two-wire process apparatus 200, the sensor 4_3 in the sub-machine 4 is, for example, a pressure sensor. The measured value (analog value) in the sensor 4_3 is converted into a digital value by the A/D converter 4_2 and sent to the CPU 4_1. The CPU 4_1 transmits the measured value from the A/D converter 4_2 to the host computer 3 as data.

The data (measured value) from the slave unit 4 is taken in by the CPU 3_1 of the master unit 3 . The CPU 3_1 sends the acquired data to the current control circuit 3_2. The current control circuit 3_2 adjusts the value of the current I returning to the two-wire transmission path L so as to be a current value corresponding to the data from the CPU 3_1.

prior art literature

Patent Literature

Patent Document 1: Specification of US Patent No. 5870695

SUMMARY OF THE INVENTION

Invention to solve problem

In this two-wire processing apparatus 200, when the current (current signal) I supplied via the two-wire transmission path L is set to, for example, 4 to 20 mA, the current that can be used in the two-wire processing apparatus 200 is It is limited to 4mA or less (eg, 3.6mA) that can be always ensured.

However, there is a problem in that in a noisy environment such as a factory, the current consumed by the communication between the main machine 3 and the sub-machine 4 is preferably large. current, must sacrifice current consumption elsewhere.

The present invention has been made in order to solve these problems, and an object thereof is to provide a two-wire process apparatus capable of securing the current consumed by the communication between the master unit and the slave unit without sacrificing the current consumption elsewhere.

Technical means to solve problems

In order to achieve such an object, the present invention provides a two-wire process apparatus (100) including: a primary power supply circuit (12_1) configured to generate a power supply voltage from a current supplied via a two-wire transmission path (L) (V1); the master main power supply circuit (12_2), which is configured to receive the power supply voltage supplied from the primary power supply circuit and generate the main power supply voltage (V2) used in the master (1); the slave main power supply circuit (21_1) ) which receives power supplied from the primary power supply circuit and generates a main power supply voltage (V3) used in the slave (2); The value of the current, the two-wire process device (100) receives the data sent from the sub-machine through the main machine, and adjusts the value of the current detected by the current detection resistor according to the received data, the two-wire process The device is characterized in that the parent machine (1) is provided with: a parent machine main circuit (12) including a primary power supply circuit (12_1), a parent machine main power supply circuit (12_2), and an arithmetic processing unit (12_3) on the parent machine side, the parent machine The arithmetic processing part of the terminal is configured to receive the power supply voltage provided from the main power supply circuit of the main machine and operate; the main machine sub-circuit (13) is provided with the communication driver (13_1) of the main machine, the auxiliary power circuit of the main machine (13_2) and the parallel adjustment of the main machine. (13_3), the communication driver on the master side is configured to send and receive data with the slave, the master side power supply circuit is configured to generate a power supply voltage (V5) to the communication driver on the master side, and the parallel regulator on the master side It is configured to generate a power supply voltage (V4) to the auxiliary power supply circuit of the main machine; and an isolator (15) on the main machine side, which is configured to transmit and receive digital data between the arithmetic processing part of the main machine side and the communication driver of the main machine side in isolation, and the slave machine (2 ) is provided with: a sub-machine main circuit (21), which includes a sub-machine main power supply circuit (21_1), and an arithmetic processing unit (21_2) on the sub-machine side, the arithmetic processing section on the sub-machine side is configured to receive the slave main power supply circuit. The slave sub-circuit (22) includes a communication driver (22_1) on the slave side, a slave sub-power supply circuit (22_2) and a parallel regulator (22_3) on the slave side, the slave The communication driver on the slave side is configured to transmit and receive data with the master, the slave sub power supply circuit is configured to generate a power supply voltage (V7) to the communication driver on the slave side, and the parallel regulator on the slave side is configured to generate a power supply voltage (V7) to the slave side. The power supply voltage (V6) of the auxiliary power supply circuit of the sub-machine; and the isolator (23) at the sub-machine end, which is configured to transmit and receive digital data between the arithmetic processing part of the sub-machine end and the communication driver of the sub-machine end in isolation, and the parallel regulator of the main machine end uses The current (IM) used in the master main circuit and returned to the two-wire transmission path via the current detection resistor generates the power supply voltage to the master sub power supply circuit, and the shunt regulator on the slave side is used in the slave main circuit and paralleled. return to dual via the current sense resistor The current (IS) of the line transmission path is used to generate the power supply voltage to the slave sub power supply circuit.

In the present invention, the main machine is provided with the main circuit of the main machine and the sub-circuit of the main machine, and the sub-machine is provided with the main circuit of the sub-machine and the sub-circuit of the sub-machine. Transmission and reception of digital data between the arithmetic processing unit in the main circuit of the main unit on the main unit and the communication driver in the sub-circuit of the main unit, and the arithmetic processing unit in the main circuit of the sub-unit on the sub-unit and the communication driver in the sub-circuit of the sub-unit Transmission and reception of digital data between them are performed in isolation through respective isolators.

In the present invention, a power supply voltage (constant voltage) is supplied from the shunt regulator on the master side to the master side sub power supply circuit that supplies the power supply voltage to the communication driver on the master side. In addition, a power supply voltage (constant voltage) is supplied from the shunt regulator on the slave side to the slave sub power supply circuit that supplies the power supply voltage to the communication driver on the slave side.

At this time, the shunt regulator on the master side uses the current used in the master main circuit and returns to the two-wire transmission path via the current detection resistor to generate the power supply voltage to the slave power circuit of the master, and the shunt regulator on the slave side is used in the slave. The main circuit uses the current returned to the two-wire transmission path via the current detection resistor to generate the power supply voltage to the slave sub power supply circuit.

In addition, in the above description, as an example, the components corresponding to the components of the invention in the drawings are denoted by reference numerals with parentheses.

effect of invention

As described above, according to the present invention, the shunt regulator on the master side uses the current used in the master main circuit and returned to the two-wire transmission path via the current detection resistor to generate the power supply voltage to the slave power circuit of the master, and the parallel regulator on the slave side The controller uses the current used in the slave main circuit and returns to the two-wire transmission path through the current detection resistor to generate the power supply voltage to the slave sub power supply circuit. The current is diverted to the communication between the parent machine and the child machine, thereby ensuring the current consumed by the communication between the parent machine and the child machine without sacrificing current consumption elsewhere.

Description of drawings

FIG. 1 is a diagram showing a main part of a two-line process apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram showing an example in which a current control circuit is provided at the sub-circuit side of the main unit.

FIG. 3 is a diagram showing a case where the parent machine and the child machine are 1:1.

FIG. 4 is a diagram showing a case where the master unit 1 and the slave unit 2 are 1:N (N≧2).

FIG. 5 is a diagram showing an example of a two-line process apparatus composed of a master machine and a slave machine.

Detailed ways

Hereinafter, embodiments of the present invention will be described in detail based on the drawings. 1 : is a figure which shows the principal part of the two-line process apparatus 100 (100A) which concerns on embodiment of this invention.

The two-line processing apparatus 100 is realized by hardware composed of a processor and a storage device, and a program that realizes various functions in cooperation with the hardware, and is composed of a main machine 1 and a slave machine 2 .

The parent machine 1 includes a parent machine main circuit 12 , a parent machine sub-circuit 13 , a current detection resistor 14 , and an isolator 15 . The slave 2 includes a slave main circuit 21 , a slave sub circuit 22 , and an isolator 23 .

In the parent machine 1, the parent machine main circuit 12 includes a primary power supply circuit 12_1, a parent machine main power supply circuit 12_2, a CPU 12_3, and a current control circuit 12_4. The master sub-circuit 13 includes a communication driver 13_1 , a master sub-power circuit 13_2 , and a shunt regulator 13_3 .

In the parent main circuit 12, the primary power supply circuit 12_1 generates the primary power supply voltage V1 from the current I supplied via the two-wire transmission path L. The master main power supply circuit 12_2 receives the primary power supply voltage V1 supplied from the primary power supply circuit 12_1, and generates a power supply voltage (main power supply voltage) V2 to the CPU 12_3.

In the parent machine sub-circuit 13, the shunt regulator 13_3 generates a power supply voltage (constant voltage) V4 to the parent machine subsidiary power supply circuit 13_2, and the parent machine subsidiary power supply circuit 13_2 generates a power supply voltage V5 to the communication driver 13_1. In this embodiment, the constant voltage diode ZD1 is used as the parallel regulator 13_3.

In the base unit 1, the current detection resistor 14 detects the value of the current I returned to the two-wire transmission path L as the voltage value Vpv. The isolator 15 is provided between the main machine main circuit 12 and the main machine sub-circuit 13, and transmits and receives digital data between the CPU 12_3 and the communication driver 13_1 in isolation. In the present embodiment, as the isolator 15, a digital isolator using magnetic coupling of coils facing each other with an insulator interposed therebetween is used.

In the slave 2, the slave main circuit 21 includes a slave main power circuit 21_1, a CPU 21_2, an A/D converter 21_3, and a sensor 21_4. The slave sub-circuit 22 includes a communication driver 22_1, a slave sub-power circuit 22_2, and a shunt regulator 22_3.

In the sub-machine main circuit 21, the sub-machine main power supply circuit 21_1 receives the primary power supply voltage V1 supplied from the primary power supply circuit 12_1 of the main machine 1, and generates a power supply voltage (main power supply voltage) V3 to the CPU 21_2.

In the slave sub circuit 22, the shunt regulator 22_3 generates a power supply voltage (constant voltage) V6 to the slave slave power supply circuit 22_2, and the slave slave power supply circuit 22_2 generates a power supply voltage V7 to the communication driver 22_1. In this embodiment, the constant voltage diode ZD2 is used as the parallel regulator 22_3.

In the slave 2, the isolator 23 is provided between the slave main circuit 21 and the slave sub circuit 22, and transmits and receives digital data between the CPU 21_2 and the communication driver 22_1 in isolation. In the present embodiment, as the isolator 23, a digital isolator using magnetic coupling of coils facing each other with an insulator interposed therebetween is used.

In this two-wire process apparatus 100, the sensor 21_4 in the sub-machine 2 is, for example, a pressure sensor. The measured value (analog value) in the sensor 21_4 is converted into a digital value by the A/D converter 21_3 and sent to the CPU 21_2. The CPU 21_2 sends the measured value from the A/D converter 21_3 to the communication driver 22_1 through the isolator 23 . The communication driver 22_1 transmits the measurement value sent from the CPU 21_2 to the base unit 1 as data.

The data (measured value) sent from the slave device 2 is received by the communication driver 13_1 in the master device 1 and taken in by the CPU 12_3 through the isolator 15 . The CPU 12_3 sends the acquired data to the current control circuit 12_4. The current control circuit 12_4 receives the voltage value Vpv representing the value of the current I detected by the current detection resistor 14 as an input, and adjusts the value of the current I returned to the two-wire transmission path L so that the voltage value Vpv becomes the same as that sent from the CPU 12_3. The voltage value corresponding to the incoming data (the voltage value corresponding to the received data).

In this two-wire process apparatus 100, the power supply voltage (constant voltage) V4 is supplied from the shunt regulator 13_3 on the main machine 1 side to the main machine sub power supply circuit 13_2, wherein the main machine sub power supply circuit 13_2 supplies power to the communication driver 13_1 on the main machine 1 side voltage V5. In addition, a power supply voltage (constant voltage) V6 is supplied from the shunt regulator 22_3 on the slave 2 side to the slave sub power supply circuit 22_2 which supplies the power supply voltage V7 to the communication driver 22_1 on the slave 2 side.

At this time, the shunt regulator 13_3 at the parent machine 1 side uses the current IM used in the parent machine main circuit 12 and returned to the two-wire transmission path L via the current detection resistor 14 to generate the power supply voltage V4 to the parent machine sub power supply circuit 13_2, and the slave machine The 2-terminal shunt regulator 22_3 uses the current IS used in the slave main circuit 21 and returned to the two-wire transmission path L via the current detection resistor 14 to generate a power supply voltage V6 to the slave sub power supply circuit 22_2.

As a result, in the two-wire process apparatus 100 of the present embodiment, the currents (IM, IS) used in the main circuits of the parent machine and the child machine can be diverted to the communication between the parent machine and the child machine, and the parent machine can be secured. The current consumed by communication between 1 and Slave 2 without sacrificing current consumption elsewhere.

It should be noted that, in the above-mentioned embodiment, the current control circuit 12_4 is provided in the main machine main circuit 12, but as in the two-wire process apparatus 100 (100B) shown in FIG. A current control circuit 12_4 is provided.

In this case, the isolator 15 between the CPU 12_3 and the communication driver 13_1 is used as the first isolator 15_1, and the second isolator 15 (15_2) is provided between the CPU 12_3 and the current control circuit 12_4.

In addition, in the above-mentioned embodiment, the case where the parent machine 1 and the child machine 2 are 1:1 (see FIG. 3 ) has been described, but the case where the parent machine 1 and the child machine 2 are 1:N (N≥2) (see FIG. 4 ) ), can also be configured in the same way.

In addition, in the above-described embodiment, digital isolators are used as the isolators 15 and 23 using the magnetic coupling of the coils facing each other with an insulator interposed therebetween. However, digital isolators such as photocouplers may be used. .

In addition, in the above-described embodiment, the constant voltage diodes ZD1 and ZD2 are used as the shunt regulators 13_3 and 22_3, but the shunt regulator used in the present invention is not limited to the constant voltage diodes.

In addition, in the above-mentioned embodiment, the case where data is transmitted from the communication driver 22_1 to the communication driver 13_1 has been described, but it is also possible to transmit a command from the host device from the communication driver 13_1 to the communication driver 22_1.

[Extension of Embodiment]

As mentioned above, although this invention was demonstrated with reference to the embodiment, this invention is not limited to the said embodiment. Various modifications that can be understood by those skilled in the art can be made within the scope of the technical idea of the present invention for the configuration and details of the present invention.

Symbol Description

1...main machine, 2...slave machine, 12...main machine main circuit, 12_1...primary power supply circuit, 12_2...main machine main power supply circuit, 12_3...CPU, 12_4...current control circuit, 13...main machine sub-circuit, 13_1...communication driver , 13_2...main unit auxiliary power circuit, 13_3...parallel regulator, 14...current detection resistor, 15(15_1, 15_2), 23...isolator, 21...slave unit main circuit, 21_1...slave unit main power supply circuit, 21_2...CPU , 21_3...A/D converter, 21_4...sensor, 22...slave sub-circuit, 22_1...communication driver, 22_2...slave sub-power circuit, 22_3...parallel regulator, 100(100A, 100B)...two-wire process device.

Claims (5)

1. A two-wire processing apparatus includes:

a primary power supply circuit configured to generate a power supply voltage from a current supplied via a two-wire transmission path;

a master main power supply circuit configured to receive a power supply voltage supplied from the primary power supply circuit and generate a main power supply voltage used in the master;

a slave unit main power supply circuit configured to receive the power supplied from the primary power supply circuit and generate a main power supply voltage used by the slave unit; and

a current detection resistor that detects a value of a current returned to the two-wire transmission path,

the two-wire process apparatus is characterized in that the master unit receives data transmitted from the slave unit and adjusts the value of the current detected by the current detection resistor based on the received data,

the master is provided with:

a main circuit of a main unit including the primary power supply circuit, the main power supply circuit of the main unit, and a main-unit-side arithmetic processing unit configured to operate by receiving a power supply voltage supplied from the main power supply circuit of the main unit;

a master-slave circuit including a master-slave communication driver, a master-slave power supply circuit, and a master-slave parallel regulator, the master-slave communication driver being configured to transmit and receive data to and from the slave units, the master-slave power supply circuit being configured to generate a power supply voltage to the master-slave communication driver, the master-slave parallel regulator being configured to generate a power supply voltage to the master-slave power supply circuit; and

a parent-side isolator configured to transmit and receive digital data between the parent-side arithmetic processing unit and the parent-side communication driver in an insulated manner,

the slave unit includes:

a slave unit main circuit including the slave unit main power supply circuit and a slave unit-side arithmetic processing unit configured to operate by receiving a power supply voltage supplied from the slave unit main power supply circuit;

a slave unit sub-circuit including a slave unit-side communication driver, a slave unit sub-power supply circuit, and a slave unit-side parallel regulator, the slave unit-side communication driver being configured to transmit and receive data to and from the master unit, the slave unit sub-power supply circuit being configured to generate a power supply voltage to the slave unit-side communication driver, the slave unit-side parallel regulator being configured to generate a power supply voltage to the slave unit sub-power supply circuit; and

an isolator on the slave side configured to transmit and receive digital data between the arithmetic processing unit on the slave side and the communication driver on the slave side in an insulated manner,

the parallel regulator on the parent terminal generates a power supply voltage to the parent-machine sub-power supply circuit by using a current used in the parent-machine main circuit and returned to the two-wire transmission path via the current detection resistor,

the sub-unit-side parallel regulator generates a power supply voltage to the sub-unit sub-power supply circuit by using a current that is used in the sub-unit main circuit and returned to the two-wire transmission path via the current detection resistor.

2. The two-wire process arrangement according to claim 1,

the main circuit of the main unit includes:

and a current control circuit that receives a voltage value indicating a current value detected by the current detection resistor and adjusts a value of the current returned to the two-wire transmission path so that the voltage value becomes a voltage value corresponding to the received data.

3. The two-wire process device according to claim 1, wherein the two-wire process device uses the parent-end isolator as a first parent-end isolator,

the master-slave circuit includes:

a current control circuit that receives a voltage value indicating a current value detected by the current detection resistor and adjusts a value of a current returned to the two-wire transmission path so that the voltage value becomes a voltage value corresponding to the received data,

the master is provided with:

and a second parent-side isolator configured to transmit digital data from the parent-side arithmetic processing unit to the current control circuit in an insulated manner.

4. The two-wire process apparatus according to any one of claims 1 to 3,

the isolator on the parent side and the isolator on the child side are digital isolators using magnetic coupling of coils facing each other with an insulator interposed therebetween.

5. The two-wire process apparatus according to any one of claims 1 to 4,

the master unit is provided with a plurality of slave units.

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