JPS63291199A - Fluid control signal transmission system - Google Patents

Abstract

PURPOSE:To minimize the delay of the contents of a transmitted signal by controlling the transmission/reception of signals between a fluid control driving device and a controller by frequency assigned by parallel control signals, multiplexing these frequency, transmitting the multiplexed frequency and obtaining parallel control signals on the receiving side. CONSTITUTION:A transmitter 1 for controlling frequency previously fixed in each fluid control means by a control signal in each fluid control means controlled by a master control machine 10, multiplexing plural control frequency components and sending the multiplexed frequency is built in a control device. A receiver 2 for extracting a signal with the frequency fixed in each fluid control means out of inputted signals and controlling an electromagnetic manihold 20 to be the fluid control means based on the extracted signal is built in the fluid control driving device. The transmitter 1 is connected with the receiver 2 through a signal line 3 and a control signal is transmitted/received based on the frequency-multiplexed signal. Consequently, plural control signals can be simultaneously transmitted through only one signal line and control can be immediately transmitted.

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a system for electrically transmitting control signals for controlling solenoid valves that use a plurality of solenoid valves to change the direction of fluid, etc. In pneumatic systems, etc., from a control device such as a sequencer using one signal path? ! The present invention relates to a fluid control signal transmission system that can simultaneously send a large amount of signals such as multiple control signals and detection signals.

(Prior Art) In general, for example, in automobile production equipment, semiconductor manufacturing and inspection equipment, etc., solenoid valves are used to control the operation of automatic working machines, and the solenoid valves supply working fluid to actuators such as air cylinders. direction switching control is being performed.

In that case, since a large number of solenoid valves are used, these many solenoid valves are arranged together in a manifold piping, for example, in sets of several to several dozen valves, and are arranged in a centralized exhaust system or an individual supply system. By configuring the solenoid valve manifold as an integrated unit of air type and back piping type, the installation space can be saved.

In order to control the opening and closing operations of such a solenoid valve manifold, a control device such as a sequencer or micro combination is installed in a separate control panel or control box to control the opening and closing of the solenoid valve. It is connected to the control device by a very large number of electric wires, that is, at least the number of IIMI of solenoid valves plus one electric wire.

For this electrical wiring, electrical cables are usually laid using tact wiring or piping.

Normally, as a wiring-saving transmission method that transmits multiple solenoid valve control signals through a single signal line via these cables, the solenoid valve control signals at a certain point in time are summarized into a time-sharing serial signal. As such, there are many cases in which transmission is repeated over a fixed period of time, regardless of changes in state.

Note that there are control devices that send out control signals only when the command status changes, but even in that case, the control signals that are sent to the transmission line are time-sharing status signals that correspond to all of the solenoid valves. It is sent in a serially arranged signal format.

(Problems to be Solved by the Invention) Generally, several to several dozen sets of solenoid valve manifolds as described above are normally used at one location, so the number of status signals that control them also varies. The number ranges from tens to hundreds.

However, in the conventional solenoid valve control method described above, all the status signals are serially arranged in a time-division manner to form the control signal, so one transmission time is long, and as mentioned above, the change in status is Regardless, when repeatedly transmitting at fixed time intervals, all signals are transmitted from the required control time, except when there is a state change immediately before that corresponds to the first pulse sent in the transmitted signal. This will result in delays. Further, when a signal due to a malfunction is sent, the false signal is held for the transmission interval time, and the control fluid may be held in the wrong state for a long time.

On the other hand, even if a control signal is sent only when the command state changes, the actual operation may be delayed from the required control time for controls other than those corresponding to the first pulse sent. Sometimes it happens.

Therefore, the delay in control of pulses near the end of the signal sent at one time is large, which poses a particular problem.

In addition, it may not be able to respond to changes in two or more command states that occur in an extremely short period of time, and since signals with no change in state are also transmitted, there is a high possibility of malfunctions caused by the transmission line. There are also other problems.

The purpose of the present invention is to solve these problems and to simultaneously send multiple control signals through a single signal line, so that when control is required, it can be sent immediately to any controlled object without delay. The object of the present invention is to provide a fluid control signal transmission method that allows for efficient fluid control signal transmission.

(Means for Solving the Problems) In order to achieve the above object, the fluid control signal transmission system of the present invention transmits a control signal from the parent controller 10 to each fluid control means to be controlled. A transmitter 1 that controls a frequency determined for each fluid control means and multiplexes and transmits a plurality of controlled frequencies is incorporated into the control device, and a signal of a frequency determined for each fluid control means is selected from among the input signals. A receiver 2 for controlling a solenoid valve manifold 20 which is a fluid control means based on the extracted signals is incorporated into a fluid control drive device, and a transmitter 1
and a receiver 2 are connected by a signal line 3, and control signals are exchanged using the frequency multiplexed signals.

Further, the transmitter 1 intermittents a frequency determined for each fluid control means to be controlled based on a control signal from the parent controller 10, multiplexes and transmits each of the intermittent frequencies, and transmits the intermittent frequencies to the receiver. 2 is a bandpass filter F that passes a frequency determined for each of the fluid control means from among the received signals;
, , F2...Fn, and the extracted signals are rectified and smoothed to become a signal for controlling the electromagnetic valve manifold 20, which is a fluid control means. The valve manifold 20 is a solenoid valve manifold formed by a plurality of solenoid valves or a plurality of solenoid valves.

(Example) Next, the present invention will be explained with reference to the drawings.

FIG. 1 is an explanatory diagram showing, in a professional manner, the main parts of an embodiment of the fluid control transmission system according to the present invention.

FIG. 2 is an explanatory diagram showing an overall outline of a solenoid valve manifold control system using the transmission method of the embodiment shown in FIG.

As shown in FIG. 2, the transmitter 1 of this embodiment is arranged on the control device side, and the parent controller 10 and the transmitter 1 are connected by a multi-contact connector and a large number of control cables. .

Further, the receiver 2 of this embodiment is disposed on the side of the fluid control drive device, and has a solenoid valve manifold 2 that performs fluid direction switching control.
0 are connected to each other by a number of connection connectors and a number of control cables.

The transmitter 1 and receiver 2 are connected by one signal line 3. The transmitter 1 inputs a control signal, which is a parallel signal, from the master controller 10, and in order to control each solenoid valve of the solenoid valve manifold 20, transmitter 1 intermittents the frequency assigned to each solenoid valve with the input control signal. , and sends out a multiplexed signal obtained by adding all those frequencies to the signal line 3. The receiver 2 separates the multiplexed signal received from the signal line 3 using a filter with a frequency assigned to each solenoid valve, converts it into a parallel control signal, and outputs it to control each solenoid valve of the solenoid valve manifold 20. do.

Next, the configuration and operation of the transmitter 1 and receiver 2 will be explained.

As shown in FIG. 1, a transmitter 1 has a solenoid valve manifold 2.
a sine wave oscillation circuit G with a frequency assigned in advance to each of the fluid control means such as each electromagnetic valve of 0;
, Cr2...Gn, and the sine wave oscillation circuit G, , G2
. . . Switches S, , S2 . . . . . . .
2...Equipped with an adder circuit 4 that adds and multiplexes all the signals of each frequency outputted via Sn. On the other hand, the receiver 2 includes bandpass filters F, , F2 for separating the frequencies assigned to each fluid control means from the input multiplexed signal.
...Fn and...

Bandpass filter F l + F 2... Rectifying and smoothing circuit for converting the AC output of Fn to DC, respectively, D
2...Dn, and the rectifying and smoothing circuit D1. A voltage comparison circuit C1°C2...Cn that compares the output of D2...Dn with a constant voltage and outputs a control signal only when the voltage is higher than that voltage.
It is equipped with

Now, assuming that the fluid control means to be controlled are n solenoid valves, fl is applied to each of them.

To explain the operation when frequencies f2...rn are assigned, in the transmitter 1, the frequency f1 is assigned to the sine wave oscillation circuit G1, the frequency f2 is assigned to the sine wave oscillation circuit G2, and so on. It oscillates at frequency fn.

Then, the switch S1 is turned on or off by a control signal that commands the state of the electromagnetic valve to which the frequency f1 is assigned, and the signal of the frequency f1 is sent to the adder circuit 4 or not. Similarly, the switch S2 is turned on and off by a control signal to the solenoid valve assigned the frequency f2,
Thereafter, in the same manner, the switch Sn is turned on and off by the control signal to the solenoid valve to which the frequency fn is assigned. The frequencies f1 . . . are interrupted by such switches sl, s2 . All of the signals f2...fn are added to the input of the adder circuit 4 and added to perform frequency multiplexing and output to the signal line.

On the other hand, the receiver 2 receives and receives such multiplexed signals and passes them through bandpass filters F1. When input to F2...Fn, an output of frequency f1 appears in the bandpass filter F1,
An output with a frequency f2 appears in the bandpass filter F2, and similarly an output with a frequency fn appears in the bandpass filter Fn. Since the outputs of these bandpass filters are almost sinusoidal alternating current, the rectifying and smoothing circuit D1. D2...
- By rectifying and smoothing with Dn, a DC voltage approximately proportional to the area surrounded by the energy distribution curve shown by the solid line in FIG. 3 can be obtained. Therefore, the rectifier and smoothing circuit DI + D
2...The output of Dn is sent to the voltage comparator circuit c,,c2...
Cn and compares it with a constant voltage set internally, outputs a high potential when it is higher than the set voltage, and outputs a low potential when it is lower than the set voltage.
2...Pulse waveforms depending on the presence or absence of fn are output from each of the voltage comparison circuits c, , c2...Cn. The output of the voltage comparison circuit C1 obtained in this way has a waveform equivalent to the control signal issued from the parent controller 10 to control the solenoid valve to which the frequency r1 is assigned, and the output of the voltage comparison circuit C2 The output has a waveform equivalent to the control signal issued from the master controller 10 to control the solenoid valve to which the frequency f2 is assigned. Thereafter, control signals for all solenoid valves up to the solenoid valve to which the frequency fn is similarly assigned are sent to the voltage comparator circuit CI.

Since the control signals are obtained from C2...Cn, all the solenoid valves can be controlled without delay by simultaneously applying these control signals in parallel to each solenoid valve.

Note that each of the band-pass filters F I + F 2 . . . Fn needs to be sufficiently spaced from adjacent frequencies, as shown in FIG. 3, in consideration of the cutoff characteristics of the band to be passed. The curve represented by the dotted line in FIG. 3 shows an example of a case where the characteristic curve whose center frequency is f2 is adjacent to the band of the characteristic curve whose center frequency is fl shown by the solid line. .

Next, as a modified example of this embodiment, FIG. An example using multiplexed signals for transmission to the controller 10 is shown in a block diagram.

In FIG. 4, the control device includes a master controller 10 and a transmitter 1.
In addition, there is a reception v! that receives a state detection signal via the signal line 13. It is equipped with 112. The fluid control drive device includes a receiver 2, a solenoid valve 21, an operating section 22 for controlling the fluid, a detector 23 for detecting the state of operation, and a transmitter for sending a state change detection signal to the signal line 13. It is equipped with 11 machines.

The solenoid valve 21 can be controlled by the master controller 10 in the same manner as in the embodiment shown in FIG.
The state of the transmitter 23 is detected by the detectors 23 and 23, and the resulting signal is frequency-multiplexed by the transmitter 11 in the same manner as the transmitter 1 and sent to the signal line. This is the receiver 12
The signal extracted from the frequency multiplexed waveform is rectified and smoothed by the same operation as the receiver 2, and compared with the internal reference voltage of the voltage comparison circuit, and then sent to the parent controller 1 as a pulse-like parallel signal.
By setting the value to 0, it is possible to check the operation of the solenoid valve 21, etc. in the main controller 10.

Note that the signal sent to the signal line by the transmitter 11 includes information to be transmitted from the fluid control drive device side to the control device side, in addition to the detection signal of the fluid control result detected by the detector 23 and 23 depending on the state of the operating section 22. You can add signals to others.

(Effects of the Invention) As explained in detail above, the present invention controls the reception of signals between a fluid control drive device and a control device that controls the same, using parallel control signals to control frequencies assigned to each. By multiplexing and transmitting these frequencies, dividing this multiplexed signal into each frequency component on the receiving side, and obtaining parallel control signals from the output,
This has the effect of minimizing delay for all contents of the transmitted signal.

Therefore, by using this embodiment, command states that occur at short intervals can be transmitted to the control drive device in real time, so that control can be performed at accurate timing according to the program. Further, even if there is a control-related malfunction, an erroneous state command will not be held for a long time unlike in the conventional case, so there is an advantage that the adverse effects can be minimized.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing main parts of an embodiment according to the present invention in blocks. FIG. 2 is an explanatory diagram showing an example of how the embodiment of FIG. 1 is used. FIG. 3 is a curve diagram showing an example of the characteristics of the bandpass filter used in the embodiment of FIG. 1. FIG. 4 is an explanatory diagram showing another usage example of the embodiment according to the present invention. 1.11...Transmitter 2.12...Receiver 3.13...Signal line 4...Addition circuit 10...Main controller 20...Solenoid valve manifold 21...Solenoid valve 22... Solenoid valve operating section 23... Detector C,, C2,... Cn... Voltage comparator circuit,, D2
．． ...Dn... Rectifying and smoothing circuit F,, F2. ...F
n... Bandpass filter G,, G2. ...Gn...
Sine wave oscillation circuit Sl+S2. ...Sn...switch f,, f2. ...fn... Frequency patent applicant Koganei Seisakusho Co., Ltd. Agent Patent attorney Hisao Inoro 2 Figures 3 times (a Hama number) - 110 4 Figures

Claims (4)

[Claims] (1) A transmitter that controls a frequency determined for each fluid control means using a control signal from a parent controller for each fluid control means to be controlled, and multiplexes and transmits a plurality of controlled frequencies. The receiver is incorporated into a control device, extracts a signal with a frequency determined for each of the fluid control means from input signals, and controls the plurality of fluid control means based on the extracted signal. A fluid control signal transmission system characterized in that it is incorporated into a drive device, the transmitter and the receiver are connected by a signal line, and control signals are exchanged using frequency multiplexed signals. (2) The transmitter intermittents a frequency determined for each fluid control means to be controlled based on a control signal from a parent controller, multiplexes and transmits each of the intermittent frequencies, and The machine extracts a frequency determined for each of the fluid control means from the received signal using a band pass filter, rectifies and smoothes each of the extracted signals, and generates a signal for controlling the fluid control means. A fluid control signal transmission system according to claim 1. (3) The fluid control signal transmission system according to claim 1 or 2, wherein the fluid control means is a plurality of solenoid valves or a solenoid valve manifold that is a collection of a plurality of solenoid valves. (4) The fluid control drive device includes a transmitter for electrically transmitting motion detection information generated as a result of the operation of the fluid control means or the operation of another operating mechanism, and the fluid control drive device receives the motion detection information. The fluid control signal transmission system according to claim 2 or 3, wherein the control device includes a receiver.