JPS6057074A - Solenoid valve control system - Google Patents

Abstract

PURPOSE:To reduce the number of wiring leads between solenoid valves and their control device by receiving only the corresponding data to their holding addresses through a data network line. CONSTITUTION:A controlling data comprises a pair of a signal A and a signal B. The signal A contains the address signals of solenoid valves 18a to 18h, and the signal B contains the on-off control signals for each of the solenoid valves, and both the signals A, B are introduced from control devices 10, 12 synchronously or asynchronously. Each of interfaces 16a to 16h always watches the signals fed from the control devices 10, 12 through a ring bus 14 and functions to receive signals only when the signal fed to the ring bus 14 is related to its own solenoid valve.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control system for a solenoid valve or a group of solenoid valves, and more specifically, a plurality of solenoid valves or a group of solenoid valves are connected in a ring shape or in a tree shape by connecting wires such as optical fibers or coaxial cables. The present invention relates to a control system for a group of electromagnetic valves arranged in a connected manner and configured to control the electromagnetic valves by sending a predetermined signal from a control device to each electromagnetic valve via a connecting line.

2. Description of the Related Art Solenoid valves have been widely used to control the supply of driving media such as hydraulic pressure and pneumatic pressure to actuators. In this case, in order to electrically control a group of solenoid valves connected by a solenoid valve or manifold, the solenoids that make up each solenoid valve and a control device including a sequencer must be electrically connected individually. . That is, since on/off signals for the solenoid valves and electric power for driving the control valves are sent through lines connecting the individual solenoid valves and the control device, for example, 100 solenoid valves are installed. in case of,
200 lines have to be led out from the control device. For this reason, the amount of wiring between the control device and the electromagnetic valve group increases depending on the number of electromagnetic valves, and the wiring is also extremely complicated, resulting in an increase in manufacturing costs.

As a result of extensive research, the inventors of the present invention connected a plurality of solenoid valves and a control device to a network using optical fibers or coaxial cables. If the address signal and on/off signal of each solenoid valve can be checked, and the control valve itself can be driven accordingly, the amount of wiring can be reduced and the narrow space can be used more effectively. A control method for solenoid valves that facilitates operation and reduces manufacturing costs can be obtained.
I was able to solve all of the above problems all at once.

Therefore, an object of the present invention is to provide a control method for a solenoid valve that can reduce the amount of wiring between a solenoid valve and its control device, thereby reducing manufacturing costs and man-hours. purpose.

In order to achieve the above object, the present invention connects a plurality of solenoid valves and a control device through a network line, and transmits data including address signals and on/off command signals for the solenoid valves from the control device to the control device. The power is supplied to the electromagnetic valves via a network line, and each of the electromagnetic valves receives the data corresponding to the address it owns and energizes or deenergizes it.

Next, preferred embodiments of a control system for a solenoid valve according to the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 1, reference numeral 10 indicates a first control device, and reference numeral 12 indicates a second control device. As can be understood from the figure, the first control device 10 and the second control device 12 are connected by a ring bus 14, which is a network line formed of optical fibers in a ring shape, and the ring bus 14 is connected to the ring bus 14. Solenoid valves 18a to 1 via interfaces 16a to 16h, respectively.
Connect 8b. ? ll11 control device 10 and control device 12b, solenoid valves 18a and 18 for ring lotus 14.
In this case, as shown in FIG. 2, the control data consists of a pair of All 11 or B word signals.

Therefore, the A yard contains address signals for each of the solenoid valves 18a to 18h, and the B word contains a signal for controlling on/off of each solenoid valve. Deriving data signals synchronously or asynchronously.

The interfaces 16a to 16h monitor the signals sent from the control device 10 and the control device 12 via the ring bus 14, and when the ring bus 14 receives a signal related to its own solenoid valve. only functions to capture that signal.

At this time, among the signals sent, the on/off control signal for the solenoid valve is generally a serial signal, so it is converted into a parallel signal at the interface, and thereby the control signal for the solenoid valve ( (not shown).

In this case, a memory circuit is attached to each of the solenoid valves 18a to IB (1), and only when there is a change in the conventional data,
Data related to the change is sent from the control devices 10 to 12 to the ring bus 14 to rewrite the data in the memory circuit,
In other cases, the solenoid valve is
The structure is designed to increase or decrease power. That is, when performing on/off control of a specific solenoid valve, new data is sent from the control device 10, (2) only when there is a change from off to on, for example, and when there is no change, data is sent to the memory. Make sure to retain the previous data (.

Next, another embodiment is shown in FIG. In this example,
Unlike the previous embodiment, the control device and each electromagnetic valve are connected by a lotus connected in a tree shape. That is, the lotus 22 is extended in a tree shape from the control device 20, and the solenoid valves 24a to 24i are connected to the branches, respectively. Also in this embodiment, each electromagnetic valve and the bus 22 are connected via an interface (not shown) to the control device 20.
An address signal and an on/off signal for a solenoid valve are sent from the interface, and only a control signal related to a predetermined solenoid valve specified by the address signal is identified and taken in by the interface.

According to the present invention, as described above, the control device sends a control signal to energize or deenergize each of a plurality of solenoid valves via a single bus line, and the solenoid valve side receives its own specified address. It is possible to determine and capture the address signal and on/off signal corresponding to the address signal. Therefore, the number of wires between the control device and the solenoid valve can be significantly reduced, manufacturing costs and man-hours can be reduced, and the reliability of the entire device can be improved. It will be done.

The present invention has been described above with reference to preferred embodiments, but
The present invention is not limited to this embodiment (the network line is constructed not only from optical fibers but also from coaxial cables, bus cables, twisted cables, etc., and the on/off signals of solenoid valves are also parallel signals). It goes without saying that various improvements and changes in design are possible without departing from the spirit of the present invention, such as being able to send the same.

[Brief explanation of drawings]

The figures relate to the present invention, and FIG. 1 is an explanatory diagram of a state in which a control device and a solenoid valve are connected by a ring bus;
FIG. 2 is an explanatory diagram of signals sent from the control device to the solenoid valve, and FIG. 3 is an explanatory diagram of a state in which the control device and the solenoid valve are connected in a tree shape. 10...First control device 12...Second control device 14
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Claims (1)

[Scope of Claims] (11 A plurality of solenoid valves and a control device are connected through a network line, and the control device transmits data including address signals and on/off command signals for the solenoid valves via the network line. A control method for a solenoid valve, characterized in that the solenoid valve receives the data corresponding to the address it owns and energizes or deenergizes it. (2) Patent In the system set forth in claim 1, the network line is a control system for a solenoid valve made of optical fiber. (3) In the system set forth in claim 1, the network line is a coaxial cable, a bus A control method for a solenoid valve that includes either a cable or a twisted cable.