JPH05149466A - Electromagnetic proportion valve - Google Patents

Abstract

PURPOSE:To facilitate change operation by selecting the change in flow rate and pressure of a valve and the change in respective delay times in ascending and descending out of the memory data of storage elements provided for an amplifier unit, and rewriting the new data of the storage elements by means of a writing unit. CONSTITUTION:This electromagnetic proportion valve 1 controls flow rate and pressure by controlling a drive current supplied to electric magnets 2A and 2B. In this case, storage elements 18 which store the change in flow rate and pressure of a valve and the change respective delay times in ascending and lowering, are provided for an amplifier unit 3. Respective communication units 13 and 14 are provided for a write unit 5 for rewriting data to be stored in the storage elements 18, and for the amplifier unit 3. Furthermore, data required in advance is stored in the storage elements 18 by means of the actuator 7 of the write unit 5. By means of pattern control unit 25, one set of a plurality of data sets is selected, or data stored in the storage elements 18 is rewritten. By this constitution, the setting of flow rate and pressure, or of delay in time arising accordingly can thereby be changed with ease.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid proportional valve for controlling a drive current supplied to an electromagnet to control a flow rate or pressure.

[0002]

2. Description of the Related Art Conventionally, an electromagnetic proportional valve of this type is disclosed in Japanese Patent Publication No. 2-22272. This is one of a plurality of setters consisting of variable resistors that generate a set signal corresponding to the adjusted flow rate or adjusted pressure in the amplifier unit mounted on the valve body, and one of the set signals from these setters. Switching selection means for switching and selecting one based on an external signal, and rising / falling delay time adjustment for providing individually adjusted rising delay change and falling delay change for rising and falling of the setting signal obtained from the switching selection means. Means and further an amplifier for supplying a drive current according to the setting signal output from the rising / falling delay time adjusting means to the electromagnet, are provided, and a plurality of setting devices and rising / falling delay time adjustments are provided according to the application of the valve. The means are adjusted to provide optimum valve actuation.

[0003]

However, with this valve, whenever it is attempted to change the set adjustment flow rate or adjustment pressure or its rise / fall delay time,
Since it is necessary to adjust the variable resistor of the setter and the rise / fall delay time adjustment means, this valve is installed for controlling the operation of machine tools and press machines that process several types of workpieces, for example. If each set value has to be changed by such a setting, such adjustment operation must be performed while being restricted by the installation location of the valve, and there is a problem that changing the set value becomes complicated. The present invention solves such a problem by making it easy to change the set value for setting the adjustment flow rate or the adjustment pressure or the rise / fall delay time thereof, so that the optimum operation control of the installed machine can be obtained. It provides a proportional valve.

[0004]

Therefore, according to the present invention, a storage element for rewritably storing a plurality of sets of data for setting an adjusted flow rate or adjusted pressure of a valve and its rising / falling delay time is provided, and an external device is also provided. A setting unit that outputs a parallel digital signal corresponding to one set of data of a storage element that is selected according to a signal, and a parallel digital signal from the setting unit is input and an analog signal corresponding to this input signal is output An amplifier unit having a digital-to-analog converter section and an amplifier section for inputting an analog signal from the digital-to-analog converter section and supplying a drive current corresponding to the input signal to the electromagnet is mounted on the valve body or the electromagnet. There is. Further, according to the present invention, a storage unit for rewritably storing data for setting the adjusted flow rate or adjusted pressure of the valve and its rise / fall delay time is provided, and a setting unit for outputting parallel digital signals according to the data of the storage element. And a digital-analog converter that inputs a parallel digital signal from the setting unit and outputs an analog signal according to this input signal, and an analog signal from the digital-analog converter that is input, and drives according to this input signal. An amplifier unit having an amplifying section for supplying current to an electromagnet is mounted on the valve body or the electromagnet, and a writing unit for writing data to a storage element is provided separately from the amplifier unit and arranged separately from the amplifier unit. A transmission means for transmitting write data from the write unit to the amplifier unit is provided.

[0005]

According to the first structure as means for solving the problem, the adjusted flow rate or adjusted pressure and its rise / fall delay time are selected from a plurality of sets of data stored in the storage element. Since it is set by a set, by storing the necessary data in a plurality of sets of storage elements in advance, when changing the set value, one set of data is selected by an external signal and the conventional adjustment work is performed. You can easily change without going through. Further, according to the second configuration, when it is necessary to rewrite the data of the storage element that sets these in order to change the setting of the adjustment flow rate or the adjustment pressure or the rise / fall delay time thereof, the writing unit You can write the data required for new settings to the memory element and rewrite the data, and the writing unit can be placed separately from the amplifier unit and separated from it, so write in a place that is easy to work apart from the valve installation location. The unit can be handled, and it is not affected by the installation location of the valve, and change work can be simplified.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention in which an electromagnetic proportional valve is applied to a current control type directional flow control valve will be described below with reference to the drawings. FIG. 1 shows the appearance of this valve, and reference numeral 1 denotes a valve body, which is equipped with electromagnets 2A and 2B so that a valve body (not shown) incorporated therein can be operated. As shown by the symbol in FIG. 2, this valve causes the electromagnet 2A to be driven to restrict the flow between the supply port P and the output port A at an opening degree according to the drive current, and to drive the electromagnet 2B to supply the port. It has a well-known configuration in which the control flow rate to the output ports A and B corresponding to the drive current is obtained by restricting and flowing between P and the output port B at an opening degree corresponding to the drive current. 3 is an amplifier unit,
It is mounted on the valve body 1 so as to supply the drive currents corresponding to the plurality of adjusted flow rates and the rising / falling delay times thereof to the electromagnets 2A and 2B. 4 is an operation indicator, which is an electromagnet 2A, 2B
It is provided on the amplifier unit 3 so as to display the adjusted flow rate and the rising / falling delay time when the valve body is actuated when the drive current is applied to the valve. Reference numeral 5 denotes a writing unit, an operating unit 7 having a plurality of keys for writing a plurality of adjusting flow rates and data for setting the rising / falling delay time thereof, and the adjusting flow rate and the adjusting flow rate during the writing operation by the operating unit 7. A data display 6 for displaying the rising / falling delay time, and is detachably attached to the amplifier unit 3 via a connector 9 via a signal line 8. Reference numeral 10 denotes an external signal line that outputs signals from a switching selector 24 and a pattern selector 25, which will be described later, to the amplifier unit 3.
It is provided to lead to.

The configuration of the amplifier unit 3 and the writing unit 5 consists of a block diagram as shown in FIG. In the writing unit 5 of FIG. 3, 11 is an input / output device, which connects the input port 11A to the operation device 7, the output port 11B to the data display device 6, and the data bus line 11C to the common bus line 12. The write data input by operating the operation unit 7 is output to the common bus line 12, and the data on the common bus line 12 is input and output to the data display unit 6. 13 is a communication device, and communication terminals 13A, 1
3B is connected to the communication terminals 14A and 14B of the communication device 14 provided in the amplifier unit 3 described later via the signal line 8,
The communication device 13 converts a serial signal transmitted from the communication device 14 into a parallel signal and outputs the parallel signal to the buffer register 13E, or converts a parallel signal of the buffer register 13E into a serial signal and transmits the serial signal to the communication device 14. It has a section 13D. The buffer register 13E of the communication device 13 is connected to the common bus line 12 by the data bus line 13C.
A storage element 15 rewritably stores data, and connects the data bus line 15A to the common bus line 12. 1
Reference numeral 6 denotes a CPU that operates according to a program stored in the read-only storage element 17, connects the data bus line 16A to the common bus line 12, and connects the storage element 15 to the buffer register 13E of the communication device 13 or the input / output device 11. In between, parallel digital signals corresponding to data are sent through the common bus line 12 to write / read data.

In the amplifier unit 3 of FIG. 3, the communicator 14 is the communicator 13 in the writing unit 5 described above.
And a buffer register 14E and a transmitter / receiver 14D having communication terminals 14A and 14B.
The data bus line 14C is connected to the common bus line 19. Then, the communication devices 13 and 14, the signal line 8, and the connector 9
And constitutes a data transmission means. Reference numeral 18 is a storage element for rewritably storing a plurality of sets of data for setting the adjusted flow rate and its rise / fall delay time, and the data bus line 18A is connected to the common bus line 19. Reference numeral 20 denotes an input / output device, which is a switching selector 2 described later, in which the input port 20A is provided outside the amplifier unit 3 via the external signal line 10 shown in FIG.
4 and the pattern selector 25, the output port 20B of which is connected to the operation indicator 4, the data bus line 20C is connected to the common bus line 19, and are operated by the switching selector 24 and the pattern selector 25. Contact signal is common bus line 1
9 and the digital data signals in parallel on the common bus line 19 are input and output to the operation indicator 4. Reference numeral 21 denotes a digital-analog conversion unit, which connects the data bus line 21A to the common bus line 19 and the analog data line 21B to the amplification unit 22.
A parallel digital data signal input via the converter is converted into an analog voltage and output to the analog data line 21B. The amplification unit 22 guides the analog data line 21B of the digital-analog converter 21 to the inside and is connected to the electromagnets 2A and 2B, and the digital-analog converter 2 is connected.
It is provided so that the analog voltage input from 1 is amplified and a current proportional to this voltage is supplied to the electromagnets 2A and 2B as a drive current. Here, the amplification section 22 is provided so as to selectively drive the electromagnets 2A and 2B with the positive and negative output voltages from the digital-analog conversion section 21. 23 is CP
In U, based on the program stored in the read-only storage element 26, writing and reading of digital signals in parallel with the buffer register 14E of the communication device 14 and the storage element 18 via the common bus line 19 are performed. , And sends a parallel digital signal obtained by performing appropriate calculation to the digital-analog converter 21. And the CP connected to the common bus line 19
The U 23, the storage element 18, the read-only storage element 26, and the input / output device 20 constitute the setting unit 27. Further, the switching selector 24 installed outside the amplifier unit 3 has four contacts T1, T2, T3, and T4 and is connected to the input port 20A of the input / output device 20 via the external signal line 10, and these four By closing one of the contacts T1, T2, T3, T4, the adjusted flow rate corresponding to that contact and its rise / fall delay time can be read out from the memory element 18, and for example, by opening / closing these four contacts, It is provided so as to obtain the adjusted flow rate characteristic as shown in FIG. Further, the pattern selector 25 has a plurality of contacts P1, P2, ..., Pn and is connected to the input port 20A of the input / output device 20, and the plurality of contacts P1, P2.
, ..., Pn is closed to select the adjusted flow rate pattern corresponding to the contact.

FIG. 5 is a block diagram showing the state of the adjusted flow rate stored in the storage element 18 and the rise / fall delay time thereof. The data Mi (i = 1, 2, ..., N) for the electromagnet 2A and the electromagnet 2B. A plurality of sets of pattern data PiM (i = 1, 2, ..., N) defining one pattern of valve operation are sequentially formed with the data Ni (i = 1, 2, ..., N) for Therefore, a plurality of patterns of valve operation are stored in advance, and the contact Pi for turning on the pattern selector 25 described above is stored.
The pattern data PiM corresponding to is selected. That is, when P1 of the pattern selector 25 is turned on, P1M is selected, when P2 is turned on, P2M and so on. Similarly, when Pn is turned on, PnM is selected. Then, in the pattern data PiM, the flow rate data F
1ai, F2ai, F1bi, F2bi (i = 1, 2,
..., n) and their rise / fall delay times t1ai, t2ai,
t3ai, t1bi, t2bi, t3bi (i = 1,
The data of 2, ..., N) are stored in the order of addresses in the arrangement as shown in FIG. Here, for each of these data, the subscript i
As a representative of the control pattern of the valve given by P1M when 1 is 1, F1a1
Is data that gives the flow rate to be obtained when only the contact T1 of the switching selector 24 is turned on, and t1a1 is data corresponding to the delay time until reaching this. F2a1 is data that gives a flow rate to be obtained when the contacts T1 and T2 of the switching selector 24 are simultaneously turned on, and t2a1 is data corresponding to a delay time until reaching this. t3a1
Is data which gives the time until the flow rate reaches zero when the contacts T1 and T2 of the switching selector 24 are simultaneously turned off.
Further, F1b1 is data giving a flow rate to be obtained when only the contact T3 of the switching selector 24 is turned on, and t1b1
Is data corresponding to the delay time until reaching this. F2b1 is data which gives the flow rate to be obtained when the contacts T3 and T4 of the switching selector 24 are turned on at the same time.
2b1 is data corresponding to the delay time until this is reached. t3b1 is data that gives the time until the flow rate reaches zero when the contacts T3 and T4 of the switching selector 24 are simultaneously turned off. The meaning of each data is the same from P2M to PnM.

FIG. 6 is a flow chart showing the overall operation of the current control type directional flow control valve of the present invention. In FIG. 6, when the process is started, when all the contacts Pi of the pattern selector 25 are off, writing can be performed by inputting the write key 7A provided on the operation unit 7 of the writing unit 5. The input signal of the writing key 7A is sent from the input / output device 11 of the writing unit 5 to the communication device 13 by the CPU 16.
Is sent to the buffer register 13E of the amplifier unit 3 and converted into serial data by the transmitting / receiving unit 13D to be transmitted to the communication unit 1 of the amplifier unit 3.
4 is converted into parallel data by the transmission / reception unit 14D of the communication device 14 and read by the CPU 23 from the buffer register 14E. Then, if one of the contacts of the pattern selector 25 is selected in the judgment 100, the pattern data PiM corresponding thereto is selected in the processing 104, and if the contact of the switching selector 24 is turned on in the judgment 105, it is selected in the processing 106. It is provided to drive the electromagnet according to the pattern.

FIG. 7 is a flow chart showing in detail the writing process of the process 103 in FIG. In FIG.
First, in 201, each data forming the pattern data P1M to PnM stored in the storage element 18 of the amplifier unit 3 is sequentially written for each address storage element 15 of the unit 5.
Written to. That is, the CPU 23 uses F at the starting address.
The data from 1a1 to t3bn of the termination address is sequentially sent to the buffer register 14E of the communication device 14, and this is converted into serial data by the transmission / reception unit 14D and the writing unit 5
Of the buffer register 13E to C.
The PU 16 writes this from the predetermined starting address to the ending address of the storage element 15. Next, at decision 202, the edit key 7B of the operation device 7 is pressed to write data in step 203. Process 20 by inputting the Trans key 7F in the determination 204
Contrary to 1, the data in the storage element 15 is sequentially written to the original address of the storage element 18. At this time, the process 201
On the contrary, the data from the starting address to the ending address of the storage element 15 is sequentially sent by the CPU 16 to the communication device 13, converted into serial data and sent to the communication device 14, and the CPU 23 sequentially writes the data in the storage device 18. ing.

FIG. 8 is a flow chart showing the data writing process of the process 203 in FIG. 7 in more detail. In FIG. 8, the CPU 16 reads the data written in the storage element 15 from the starting address of the storage element 15 for each address and writes the data in the input / output device 11, and in the determination 306, the operation device 7
If there is data input by the data key 7D of No., process 307
The data written in the input / output device 11 with the data key 7D
The data written in the input / output unit 11 is left as it is if it is rewritten to the data input by the key or if there is no data input. At decision 308, the data written or rewritten in the input / output device 11 by the input of the ENT key 7C is written in the original address of the storage element 15. When the stop key 7E is input at decision 304, this process ends, but if the stop key 7E is not input, the data up to the end address is rewritable.

FIG. 9 is a flow chart showing the process of driving the electromagnet in the process 106 in FIG. 6 in more detail. In FIG. 9, the judgment 401 is the contact T1 or T of the switching selector 24.
When only T1 is turned on in the input waiting state for selecting 3, the electromagnet 2A is selected and the process proceeds to 402. Process 4
In 02, the CPU 23 causes the analog voltage output from the digital-analog converter 21 to reach the voltage VF1ai corresponding to the flow rate F1ai between zero volt and time t1ai at a rate of change Δ.
V1 / ΔT is calculated, and a parallel signal for changing a minute voltage ΔV1 is converted into a digital-analog converter 2 at every minute time ΔT.
1 and outputs a constant parallel signal corresponding to the voltage VF1ai after the time t1ai elapses. This state is shown in FIG. 10, and the analog voltage output from the digital-analog converter 21 changes stepwise until it reaches VF1ai. Then, when T2 is further turned on in the determination 403, the process proceeds to 404. In process 404, the CPU 23 changes the analog voltage output from the digital-analog converter 21 from the voltage VF1ai corresponding to the flow rate F1ai to the flow rate F2ai.
Change rate ΔV2 / ΔT reaching voltage VF2ai corresponding to
Is calculated and a parallel signal for changing the minute voltage ΔV2 is output to the digital-analog converter 21 at every minute time ΔT, and a constant parallel signal corresponding to the voltage VF2ai is output after the time t2ai has elapsed. Subsequently, when both T1 and T2 are turned off in the determination 405, the process proceeds to 406. In step 406, the CPU 23 determines that the analog voltage output from the digital-analog converter 21 is the voltage VF corresponding to the flow rate F2ai.
Rate of change reaching zero volts from 2ai to time t3ai Δ
V3 / ΔT is calculated, and a parallel signal for changing a minute voltage ΔV3 is converted into a digital-analog converter 2 at every minute time ΔT.
1 and outputs a constant parallel signal corresponding to a voltage of 0 volt after the time t3ai has elapsed. If only T3 is turned on in the determination 401, the electromagnet 2B is selected and the process proceeds to 407. In the process from the process 407 to the process 411 for the electromagnet 2B, the same calculation as the process performed from the process 402 to the process 406 for the electromagnet 2A is performed, and the flow rates F1bi and F2bi and the rising / falling delay time t1.
Bi and t2bi are provided so as to be output to the digital-analog conversion unit 21.

Next, the operation of this structure will be described. Data is written in the memory element 18 of the amplifier unit 3 as shown in FIG. 5, and when the contact P1 of the pattern selector 25 is turned on, the contacts T1, T2 of the switching selector 24,
In response to the operation of T3 and T4, the valve is operated by driving the electromagnets 2A and 2B so that the flow rate as shown in FIG. 4 is obtained. At this time, the writing unit 5 is disconnected from the amplifier unit 3 by removing the connector 9. When the contact P1 is turned off when the flow rate pattern is to be changed, when the drive of the electromagnet 2A or 2B is finished, the contact Pi (i = 1, 2,
..., n), waiting for input, so new contact points P2, P
By turning on any one of 3, P4, ..., Pn, the pattern data P2M, P3M, P4M,
..., PnM can be selected. Therefore, data indicating a plurality of patterns predicted in advance is PiM (i = 1,
, ..., n), the contact Pi
By selecting (i = 1, 2, ..., N), different flow rate patterns can be selected and used, and the flow rate pattern can be changed very easily.

Further, by rewriting the contents of the memory element 18,
When trying to obtain another flow rate pattern, the contact point Pi (i = 1, 2,
, N) is turned off, the writing unit 5 is connected to the amplifier unit 3 by connecting the connector 9, and then the operation unit 7
Writing can be obtained by inputting the writing key 7A of, and writing can be performed as shown in FIGS. 7 and 8. After the writing is completed, the connector 9 can be removed again to disconnect the writing unit 5 from the amplifier unit 3, and the valve operation can be performed by the input of the contacts Pi (i = 1, 2, ..., N). At the time of this writing, the writing unit 5 and the amplifier unit 3 can be separated from each other by the signal line 8. Therefore, even in a place where writing is difficult, such as a narrow valve or a high valve, workability can be kept away from that. The writing operation can be performed from a good location, and the flow pattern can be easily changed without being restricted by the installation location of the valve as in the conventional case. Since the flow rate pattern can be set by the data written in the storage element 18,
Compared with the case where a plurality of variable resistors are adjusted and set as in the prior art, work experience is not required, and even an unskilled worker can easily set the optimum flow rate pattern. Further, since the writing unit 5 may be normally separated from the amplifier unit 3, there is an advantage that one writing unit 5 can handle a plurality of valves.

In the present embodiment, the pattern data PiM is selected according to the turning on of the contact Pi of the pattern selector 25. However, the plurality of contacts P1 and P of the pattern selector 25 are selected.
It is also possible to select the pattern data PiM corresponding to the so-called BCD code or BIN code in which ON, OFF of 2, ..., Pn are combined. Further, the amplifying section 22 is configured to selectively drive the electromagnets 2A and 2B with the positive and negative output voltages from the digital-analog converting section 21, but the digital-analog converting section 21 is provided with two channels and one of the positive channels is positive. Electromagnet 2A with output voltage,
The electromagnet 2B may be selectively driven by the positive output voltage of the other channel. The transmission of signals between the writing unit 5 and the amplifier unit 3 is performed by the communication devices 13, 1
4, the common bus line 12 of the writing unit 5 and the common bus line 1 of the amplifier unit 3 may be used.
9 may be provided with buffers, and the buffers may be connected by a bus line to transmit signals in parallel, or the optical signals may be transmitted in series and connected by an optical fiber cable. It is also possible to directly transmit an optical signal wirelessly without using an optical fiber cable for transmission. Further, in the present embodiment, the solenoid proportional valve is applied to the directional flow control valve, but it goes without saying that it can also be applied to the flow control valve and the pressure control valve, and the amplifier unit may be mounted on an electromagnet.

[0017]

As described above, according to the present invention, the amplifier unit is mounted on the valve body or the electromagnet, and a plurality of adjustment flow rates or pressures and changes in the rise / fall delay time are stored in the storage element provided in the amplifier unit. An appropriate one set is selected from the set of data by an external signal, or data required for new setting is rewritten to a storage element provided in the amplifier unit by a writing unit from a place separated from the amplifier unit. Therefore, when changing the setting, it is possible to eliminate the situation where the changing work is performed while being restricted by the place where the valve body of the solenoid proportional valve is installed, and it is possible to easily change the setting. Further, since the setting of the adjustment flow rate or the adjustment pressure and its rise / fall delay time is given based on the data stored in the storage element provided in the amplifier unit, adjustment by a variable resistor or the like is required to give this setting as in the conventional example. It has an effect that it is possible to provide a solenoid proportional valve which does not require a delicate adjustment work requiring skill and is easy to handle.

[Brief description of drawings]

FIG. 1 is an external view of a current control type directional flow control valve showing an embodiment of the present invention.

FIG. 2 is a symbol diagram showing the function of the current control type directional flow control valve shown in FIG.

FIG. 3 is a block diagram of an electric circuit that constitutes an amplifier unit and a writing unit of the present invention.

FIG. 4 is an operation explanatory view of a current control type directional flow control valve showing an embodiment of the present invention.

5 is a block diagram showing a state in which an adjusted flow rate and its rise / fall delay time are stored in a storage element provided in the amplifier unit shown in FIG.

6 is a flowchart showing the overall operation in FIG.

FIG. 7 is a flowchart showing the writing process of FIG. 6 in more detail.

FIG. 8 is a flowchart showing the data writing process of FIG. 7 in more detail.

9 is a flowchart showing the process of driving the electromagnet of FIG. 6 in more detail.

FIG. 10 is a graph showing a state of a stepwise analog voltage output from the digital-analog converter.

[Explanation of symbols]

 1 Valve Main Body 2A, 2B Electromagnet 3 Amplifier Unit 5 Writing Unit 18 Storage Element 21 Digital-Analog Converter 22 Amplifier 27 Setting Section

Claims (3)

[Claims] 1. An electromagnetic proportional valve for controlling a flow rate or a pressure by controlling a drive current supplied to an electromagnet, wherein a plurality of sets of data for setting a regulated flow rate or regulated pressure of the valve and its rise / fall delay time are rewritten. A setting unit that includes a storage element that stores as much as possible and that outputs a parallel digital signal corresponding to one set of data of the storage element that is selected according to an external signal, and a parallel digital signal from the setting unit It has a digital-analog converter that inputs and outputs an analog signal corresponding to this input signal, and an amplifier that inputs the analog signal from the digital-analog converter and supplies a drive current corresponding to this input signal to the electromagnet. An electromagnetic proportional valve characterized in that the amplifier unit is installed on the valve body or on an electromagnet. 2. The solenoid proportional valve according to claim 1, wherein a write unit for writing data to the storage element is provided separately from the amplifier unit and the write data is sent from the write unit to the amplifier unit. 3. An electromagnetic proportional valve for controlling a flow rate or a pressure by controlling a drive current supplied to an electromagnet, and rewritably storing data for setting a regulated flow rate or regulated pressure of the valve and its rise / fall delay time. A digital analog that includes a storage element that outputs a parallel digital signal corresponding to the data of the storage element, and a parallel digital signal that is input from the setting section and outputs an analog signal corresponding to the input signal. An amplifier unit having a conversion unit and an amplification unit that inputs an analog signal from the digital-analog conversion unit and supplies a driving current corresponding to the input signal to the electromagnet is mounted on the valve body or the electromagnet, and a storage element The writing unit that writes data to the amplifier unit is provided separately from the amplifier unit, and the writing unit An electromagnetic proportional valve characterized by comprising a transmission means for transmitting write data to an amplifier unit.