JPS63293376A - Solenoid valve group control system - Google Patents

Abstract

PURPOSE:To eliminate the delay of solenoid valve control by detecting a voltage level corresponding to the address of a control signal, and judging whether or not the sent out control signal is addressed to the controller itself in present use. CONSTITUTION:A control signal is sent out, the waveform of which is formed in a combination consisting of a voltage corresponding to each address set for every one of controllers 2 through 4 to be controlled, and a reference voltage. Each of controllers 2 through 4, detects the voltage level corresponding to the address of the transmitted control signal, and then judges whether or not the control signal is sent out to the controller itself in present use, so as to make control according to the content of the control signal only in the case of the signal sent out to the controller itself in present use.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a solenoid valve group control method in which a plurality of solenoid valve control machines such as a solenoid valve manifold are arranged and these are controlled by one master control machine. In particular, the present invention relates to a solenoid valve group control system that allows solenoid valves belonging to any controller to be controlled without delay using only a pair of signal lines.

(Prior art) Generally, solenoid valves are used to control the operation of automatic working machines in automobile production equipment, semiconductor manufacturing and inspection equipment, etc., and the solenoid valves are used to switch the direction of working fluid to actuators such as air cylinders. control is in place. In this case, a large number of solenoid valves are used, and in most cases, several to several dozen solenoid valves are combined and arranged together in a manifold piping system, resulting in a centralized exhaust system.

It is configured as a solenoid valve manifold, which is a unified unit with individual air supply formula and back piping system, to save installation space. In recent years, it has become increasingly necessary to control a plurality of such solenoid valve manifolds simultaneously. In such cases, conventionally, in order to control the operation of the desired solenoid valve of the solenoid valve manifold, the control signal sent from the parent controller to the controller is binary-coded with the address and control data assigned to each controller. It is serially formed and sent as a code. Therefore, each controller determines whether the address signal included in the sent control signal is assigned to its own controller, and receives the control data only when it is the appropriate address and controls the solenoid valve. It is carried out.

(Problem to be Solved by the Invention) In general, several to dozens of sets of solenoid valve manifolds as described above are normally used at one location, so it is difficult to transmit address signals for each controller and There is a problem in that it is necessary for the user to determine whether the signal has been sent to him/her, and it takes an extra amount of time to start control based on the control signal.

Furthermore, since the time required for one transmission is long, there is also the problem that subsequent commands are further delayed when the command status changes in an extremely short period of time. In addition, when wiring for control signal transmission is omitted and the control signal is superimposed on the power line and transmitted, power line transmission superimposes the signal by changing the power supply voltage waveform in some way, so 1 When the control signal sent at each time becomes longer, there is a problem in that the influence of fluctuations in the power supply voltage due to the superimposition of the control signal on the receiving side cannot be ignored.

The purpose of the present invention is to solve these problems, so that there is no delay in solenoid valve control, the length of the control signal sent at one time is short, and even when the control signal is transmitted by power line, the power supply voltage is almost the same. The object of the present invention is to provide a control method for a solenoid valve group that does not cause any adverse effects.

(Means for Solving the Problems) In order to achieve the above object, the solenoid valve group control method according to the present invention includes a controller 2.3.4 for controlling a plurality of solenoid valves.
・In a solenoid valve group control method in which multiple controllers are arranged and controllers 2, 3, 4, etc. are controlled by control signals from parent controller 1, the controller corresponds to a predetermined address for each controller to be controlled. A control signal having a waveform formed by a combination of the voltage and the reference voltage is sent out, and each controller 2, 3, 4... detects the level of the voltage corresponding to the address of the transmitted control signal. The system determines whether or not the control signal is sent to the own controller, and performs control according to the content of the control signal only based on the signal sent to the own controller. Furthermore, the controller 2. 3. 4..., a controller that controls a solenoid valve of a solenoid valve manifold made up of a plurality of solenoid valves, and the voltage corresponding to the reference voltage and the address determined for each controller to be controlled is , Among the two values of high voltage and low voltage that form the control signal, if the high potential is high when there is no signal, the high potential is used as the reference voltage, and the low potential is used as the voltage corresponding to the address, and the control signal is formed. Among the two values, if the potential is low when there is no signal, the low potential is used as the reference voltage and the high potential is used as the voltage corresponding to the address.

(Example) Next, an example of the electromagnetic valve group control system according to the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram illustrating an embodiment of a system according to the present invention.

As shown in Fig. 1, a solenoid valve 1 of a fluid control device is made by assembling a plurality of solenoid valves like a solenoid valve manifold.
Controllers 2, 13, and 14, respectively, are connected by a signal line 10 to a master controller 1 that sends control signals to these controllers.

FIG. 2 is a block diagram showing another embodiment of the system according to the present invention.

In the embodiment shown in FIG. 2, the solenoid valve 31°32
．． Controllers 21, 22, and 23 controlling the controllers 33, respectively, are connected in cascade through signal lines 10b and 10c, and the controller 21 placed at the head is connected to the master controller 11 through a signal line 10a. In this example, the control signal sent from the master controller 11 passes through each controller 21, 22, and 23 as it is, and if there is a next-stage controller, it is sent to that controller via the signal line 10d.

FIG. 3 shows the parent controller 1 or 11 in FIGS. 1 and 2.
3 shows an example of the voltage waveform of a control signal sent from the .

Figure +a) is a waveform when the potential is high (hereinafter referred to as H level) in the absence of a signal, and the H level is used as a reference value, and the low potential (hereinafter referred to as L level) is assigned to the controller to be controlled. The value corresponds to the address.

Figure (b) shows the waveform when the signal is at L level when there is no signal, and with L level as the reference value, H level is the value corresponding to the address assigned to the controller to be controlled. . A control signal having such a waveform is generated by a master controller transmitter 4o included in the master controller 1 (or 11) as shown in FIG.

FIG. 4 is a block diagram showing the internal configuration of the master controller transmitter 4o and one of the controllers 2, 3, 4 (or 21, 22, 23).

As shown in FIG. 4, the parent controller transmitter 4o includes a parallel-to-serial converter circuit 41 that converts parallel signals into serial signals, and a digital signal in which the address assigned to the controller to be controlled is expressed as a parallel signal. Consisting of a DA conversion circuit 42 that converts the voltage to a value corresponding to the address, and a pulse voltage setting circuit 43 that creates a control signal by switching the output of the DA conversion circuit 42 and the reference voltage using the output of the parallel-serial conversion circuit 41. has been done. Therefore, the control data for controlling the solenoid valve created in the parent controller 1 (or 11) using conventional technology is input to the parallel-to-serial conversion circuit 41, and the address of the controller that controls the solenoid valve is input to the DA. When input to the converter, the pulse voltage setting circuit 43 converts the parallel to serial conversion circuit 4
Based on the output of 1, the reference voltage and the DA converter output voltage are output by switching.

As a result, a control signal with a waveform as shown in FIG. 3(a) or ('b) is obtained, in which the reference voltage and the voltage corresponding to the address assigned to the controller to which the solenoid valve to be controlled belong are binary values. It will be done. This control signal is sent from the master controller 1 (or 11) to the signal line 10 (or 10a).

On the other hand, as shown in FIG. 4, the controller compares the input signal waveform with an internal reference voltage and outputs a higher voltage when it is higher than the reference voltage, and outputs a lower voltage when it is lower than the reference voltage. and a serial/parallel conversion circuit 4 that converts the serial signal into a parallel signal and outputs parallel data for controlling the solenoid valve.
6 is included. In the case of a controller that should receive or receive pulses P3 and P4 in the control signal shown in FIG. The voltage comparator circuit 45 uses a voltage level L2, which is slightly lower than the voltage corresponding to the addresses of pulses P3 and P4, as its internal reference voltage.

Therefore, this controller is supplied with pulses p as shown in Fig. 5.
p2. P3. P41 P5. When a control signal including P8 is input, the voltage comparison circuit 44 outputs a pulse PI3 corresponding to the pulse P3, a pulse P14 corresponding to the pulse P4, and a pulse P5 corresponding to the pulse P5, as shown in FIG.
15, pulse P1B corresponding to pulse P6 is output. On the other hand, the voltage comparison circuit 45 outputs a pulse P25 corresponding to the pulse P5 and a pulse P28 corresponding to the pulse P6, as shown in FIG. 5(C). However, the waveform of the output of the voltage comparison circuit 45 is inverted by the NOT circuit 47 and is input to the OR circuit 48 together with the output of the voltage comparison circuit 44, so the output of the OR circuit 48 includes pulses PI5 and PI.
3 is canceled by pulses P25 and P26 and is not output, and only pulses P13 and PI3 are output. In addition,
The capacitor connected to the output of the OR circuit 48 is
This is to prevent malfunctions by removing waveforms that occur instantaneously due to hazards or other causes that are not based on correct logic. This pulse is current-amplified and input to the serial-parallel conversion circuit 46, so that the output of the serial-parallel conversion circuit 46 is only a signal for controlling the solenoid valve belonging to this controller. In this way, the solenoid valves can be controlled only by control signals for the solenoid valves belonging to the own controller. Therefore, the parent controller l (
Or, by setting the voltage corresponding to the address of the controller among the two values that form the waveform of the control signal output from 11) using the address signal assigned to the desired controller, that signal can be used to control the desired control signal. The receiver can be used to control the operation of any solenoid valve. In the examples of FIGS. 1 and 2, only three controllers are shown, but there is no problem with using other than three controllers as long as there are multiple controllers.

(Effects of the Invention) As explained in detail above, the present invention allows the control signal sent from the master controller to be divided into two voltages: the reference voltage and the voltage corresponding to the address assigned to the controller that controls the desired solenoid valve. It determines whether the voltage corresponding to the address in the signal waveform formed by voltage and input on the controller side is assigned to the own controller, and determines whether it is the voltage assigned to the own controller. Since the solenoid valves belonging to the control valve are controlled by the signal only in the case of the control signal, there is no need to include an address signal in the control signal as in the conventional case, and the effect is that the control signal sent out at one time can be short.

Therefore, in the solenoid valve group control system configured according to this embodiment, the delay in solenoid valve control is reduced, and malfunctions occur due to delays such as when a solenoid valve in a different location must be operated for a short time. In addition, since the wiring of the signal line can be omitted, when the control signal is transmitted by the power supply line, there are also effects such as less fluctuation in the power supply voltage.

[Brief explanation of the drawing]

FIG. 1 is a block diagram illustrating an embodiment of a system according to the present invention. FIG. 2 is a block diagram showing another embodiment of the system according to the present invention. FIG. 3 is a waveform diagram showing an example of the control system of the embodiment of FIGS. 1 and 2. FIG. FIG. 4 is a block diagram showing the configuration of a part of the parent controller of the embodiment of FIG. 1 and the main parts of a typical controller. FIG. 5 is an explanatory diagram showing an example of waveforms of main parts inside the controller shown in FIG. 4. 1.11... Parent controller 2.3.4.21, 22.23... Controller 12.13
．． 14.31, 32.33...Solenoid valve 10.10a,
1. Ob, loc, 10a signal line 40... Parent controller transmitter 41... Parallel/serial conversion circuit 42... DA conversion circuit 43... Pulse voltage setting circuit 44.45... Voltage comparison circuit 46. ...Serial-to-parallel conversion circuit 47...Negation circuit 48...Order circuit Patent applicant Koganei Seisakusho Co., Ltd. Agent Patent attorney Inoro Juba 1 Figure 3 + 3 Figure

Claims (3)

[Claims] (1) Arrange multiple controllers to control multiple solenoid valves,
In a solenoid valve group control method in which the controller is controlled by a control signal from a parent controller, a waveform is formed by a combination of two values: a voltage corresponding to an address determined for each controller to be controlled and a reference voltage. Sending a control signal, each controller detects a voltage level corresponding to the address of the transmitted control signal and determines whether the control signal is a control signal sent to its own controller; A solenoid valve group control method that performs control according to the content of control signals only by signals sent to its own controller. (2) The solenoid valve group control system according to claim 1, wherein the controller is a controller that controls a solenoid valve of a solenoid valve manifold that is a collection of a plurality of solenoid valves. (3) The voltage corresponding to the reference voltage and the address determined for each controller to be controlled is the high voltage when there is no signal among the two values of high voltage and low voltage forming the control signal. , the high potential is the reference voltage, the low potential is the voltage corresponding to the address, and a control signal is formed.
Among the values, if the potential is low when there is no signal, the low potential is used as the reference voltage, and the high potential is used as the voltage corresponding to the address. control method.