JPH0683287B2 - Control signal transmission circuit in equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-device control signal transmission circuit, and particularly to an instrument such as an automatic analyzer which is suitable for simplifying the intermediate wiring and increasing the reliability of signal transmission. The present invention relates to an internal control signal transmission circuit.

[Background of the Invention]

The conventional control signal transmission circuit in equipment is all processed electrically by using a flat cable or individual wiring, but with the increase in the number of wirings, wiring storage space, noise resistance performance, unnecessary electromagnetic radiation, etc. The problem is occurring.

[Object of the Invention]

The present invention has been made in view of the above, and an object of the present invention is to simplify the intermediate wiring, and to achieve electrical insulation between the transmitting and receiving portions, thereby improving the reliability of control signal transmission. An object is to provide an in-device control signal transmission circuit that can be realized.

[Outline of Invention]

The present invention provides a time-series control of a mechanical system by driving a plurality of loads by applying a plurality of control signals generated via a microcomputer system to corresponding loads via a power supply circuit means. In the in-device control signal transmission circuit configured to perform the transmission side parallel-serial signal, which is composed of a parallel data buffer and a parallel data-serial data conversion unit, and converts the plurality of parallel control signals into a serial control signal. The optical fiber transmission means comprises a converting means, an optical fiber transmitting means using at least one optical fiber for converting the serial control signal into an electric-optical conversion signal, and a serial data-parallel data converting section and a parallel data buffer. Receiving side for converting the generated optical control signal into a parallel control signal after opto-electric conversion and inputting the parallel control signal to the power supply circuit means. Synchronization for performing operation timing control between the column-parallel signal converting means and the transmitting-side parallel-serial signal converting means provided on the transmitting-side parallel-serial signal converting means side and performing operation timing control between the transmitting-side parallel-serial signal converting means and the receiving-side serial-parallel signal converting means. It is characterized by comprising a sync signal generating means for generating a signal, and a sync signal transmitting means for electrically insulating the sync signal between transmission and reception and transmitting the sync signal to the receiving side serial-parallel signal converting means. is there.

Example of Invention

The present invention will be described in detail below with reference to the embodiment shown in FIG. 1 and FIG.

FIG. 1 is a block diagram showing an embodiment of an in-device control signal transmission circuit of the present invention. In FIG. 1, reference numeral 1 is a micro computer system, and 2 is a transmission side parallel-serial signal conversion means for converting a control signal from the micro computer system composed of a parallel data buffer 2a and a parallel data-serial data conversion unit 2b from parallel to serial. Reference numeral 3 is an optical fiber transmission means for transmitting the serialized control signal from the parallel-serial signal conversion means 2 including the electro-optical conversion transmission portion 3a, the optical fiber 3b and the optical-electric conversion transmission portion 3c. Reception side series-parallel signal conversion means for converting a reception signal from the optical fiber transmission means 3 comprising the data-parallel data conversion section 4a and the parallel data buffer 4b from serial to parallel, 5 is a power supply circuit means, and 6 is a serial- A power supply unit for supplying electric power to the parallel signal conversion unit 4 and the power supply circuit unit 5, 7 is a load, 8 is an electro-optical conversion transmission unit 8a, an optical fiber 8b and an optical fiber. A synchronous signal transmission means composed of a gas conversion receiving section 8c, and a synchronous signal generation 9 composed of a parallel-serial signal conversion means 2 and an oscillating means 9a for sending a synchronous signal to the synchronous signal transmission means 8 and a synchronous control circuit means 9b. It is a means.

In FIG. 1, after a control signal from the micro computer system 1 is electrically converted into a serial signal by a time division means, a load (pulse motor, solenoid valve, AC motor, light emitting diode) is applied by an optical fiber transmission means 3. Etc.) 7
This is a control wiring system having a configuration in which the series-parallel signal conversion means 4 is provided so that a plurality of parallel signals can be supplied to the power supply circuit means 5 to the drive system near the load 7 by transmitting to the vicinity.

As a means for supplying a serial signal to the optical fiber 3b, a parallel-serial signal converting means 2 (for example, an L like Hitachi HD46850) that can be directly connected to the bus of the microcomputer system 1 is used.
There are those that can be realized by programs such as SI, and those that are configured only by hardware that has a parallel data bus buffer and a parallel-serial signal conversion function. However, in this embodiment, the hardware configuration is used. ) Is used.

Further, in order to perform conversion synchronization of both transmission and reception systems, a synchronization signal generation means 9 is provided on the transmission side, and the synchronization signal from the synchronization signal generation means 9 is transmitted to the transmission side parallel-serial signal conversion means 2 and the reception side serial-parallel signal. The synchronizing signal to be supplied to the converting means 4 and to the receiving side is an electric signal isolating means (for example, an optical signal transferring means such as a photo coupler, an insulating transformer or an optical fiber). The transmission signal is transmitted from the transmission side to the reception side via the synchronizing signal transmission means 8 having a built-in fiber.

FIG. 2 shows an example of operation timing of the control signal transmission circuit in the device having the above-mentioned configuration. However, in order to simplify the explanation, the case where the number of transmission points is 10 is illustrated, but in reality, it is usual to transmit signals of 50 to 200 points or more.

First, as shown in FIG. 2A, the scanning period T _{1 of the} synchronization signal is selected from the load side from the required value of the minimum time for the control timing. Here, when T ₁ = 100 ms is set, the parallel signal on the transmission side is scanned every 100 ms period, and the scanning result is converted into a serial signal and sent to the optical fiber transmission means 3. Individual signals within T ₁ shown in FIG. (B) CH1~C
Since each scanning interval t ₁ up to H10 has 10 transmission points, it may be set to 10 ms when scanning synchronization T ₁ = 100 ms. That is, each state (“0” or “1”) of the individual signals CH1 to CH10 is sequentially sampled, and the output signal of the receiving side serial-parallel signal converting means 4 is shown as a receiving signal in FIG. As described above, the same pattern signal as the transmission signal shown in FIG. 7D is output (reproduced) with a time lag of at most T ₁ and is used for driving the load.

A unidirectional synchronous transmission system from the micro computer system 1 to the power supply circuit means 5 via the signal insulation system using the optical system of the two systems of the optical fiber transmission means 3 and the synchronization signal transmission means 8 as described above. By transmitting the signal by, it becomes possible to drive various loads with high reliability.

The details will be described below. On the transmission side, a parallel-serial signal conversion means 2 and a synchronization signal generation means 9 each having a hardware configuration including a parallel data buffer 2a and a parallel data-serial data conversion section 2b are used. (For example, Hitachi HD46850),
All of these elements can be incorporated in one LSI and can function as a part of the microcomputer system 1. In addition, it is possible to control the functions of all transmission side systems by software. Therefore, if the LSI is used, the circuit configuration on the transmission side is further simplified than that of FIG.

The receiving side serial-parallel signal converting means 4 is composed of a serial data-parallel data converting section 4a and a parallel data buffer 4b. The operation of these circuits is controlled from the transmitting side via the synchronizing signal transmitting means 8. Therefore, it has a one-to-one correspondence operation with the transmitting side. Since the above-mentioned Hitachi HD46850 can be used for the serial data-parallel data conversion unit 4a and 8-bit data can be output, a general-purpose parallel output LSI using this 8-bit data as the parallel data buffer 4b (eg Hitachi HD46821 etc. ), 16 output wires can be taken out from each HD46821, and by arranging the parallel data buffers 4b near the control system load, even if there are many load points, the driver can be used as a driver. Since the power supply circuit means 5 to be used can be mounted on the same printed circuit board, by mounting the power supply circuit means 5 and the parallel data buffer 4b together,
It is possible to avoid extending the signal wiring individually, and it is possible to form a compact driver that is sufficiently safe in terms of noise resistance.

The parallel data buffer 4b outputs the decoded signal.
It is intended to be stored only during the scanning time of T ₁ , but when the loads are scattered at multiple places, the circuit means necessary for decoding for each individual parallel data buffer 4b, for example, chip select A circuit means having a function for performing A reception controller is provided for this purpose. Various signals necessary for the operation of the reception control section are appropriately fetched from the serial data-parallel data conversion section 4a, the synchronization signal transmission means 8 and the like, so that timing control suitable for the operation of the entire data transmission system can be performed.

As the synchronizing signal transmission means 8, an optical fiber transmission method having an optical system or electromagnetic electrical insulation means, a simple transmission method in which a photo coupler and electric wiring are combined, and the like are used. Conversion / transmission unit 8a, optical fiber
8b and an opto-electric conversion receiving section 8c are shown, and which one should be selected appropriately according to the electromagnetic noise generation state of the use environment.

According to the embodiments of the present invention described above, the following effects can be obtained.

1. Since the optical fiber transmission means 3 and the synchronization signal transmission means 8 using the optical fiber are used for transmission of the signal and the synchronization signal from the side of the micro computer system 1 to the vicinity of the load 7, the digital signal circuit is caused by electromagnetic interference noise. The system does not malfunction, eliminating the need for countermeasures against pulsed electromagnetic noise and static electricity. Therefore, the reliability of the system function control system can be significantly improved.

2. In the frame wiring with 100 to 300 electric wires, the electric space insulated by using two optical fibers or one optical fiber and one optical means can be used as a substitute, so wiring space Is almost unnecessary, and downsizing of equipment is possible.

3. Since there is no problem even if the power supply line and the signal line are bundled and wired, there is no need for a wiring duct or metal parts for wiring separation, and the structure can be simplified.

4. The amount of wiring material is extremely small and the price can be reduced.

5. Since it is not affected by electrical noise, the wiring route becomes short, which simplifies the work and significantly reduces the wiring man-hours.

The in-device control signal transmission circuit according to the present invention is mainly
Since the original effect is exhibited when there is a large load such as a pulse motor or relay connected to a digital output, it is suitable for use in an analytical instrument such as an automatic blood analyzer or physicochemical instrument.

Further, it can be used as a signal transmission means in a control device in another field, especially when it is used in a place where electromagnetic noise is high.

Also, in the transmission of high-frequency switching signals, for example, processing signals such as pulse width modulation of 20 KHz or more, if several meters of electrical wiring are used, electromagnetic waves may be emitted, causing various EMI.
Not desirable from a defense standpoint. In this case, the shorter the length of the electrical wiring is, the more the radiation of electromagnetic waves can be avoided. Therefore, it is preferable to use the in-device control signal transmission circuit according to the present invention.

〔The invention's effect〕

As described above, according to the present invention, there is an effect that the intermediate wiring can be simplified, electrical insulation between the transmitter and receiver can be achieved, and high reliability of signal transmission can be realized.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the in-device control signal transmission circuit of the present invention, and FIG. 2 is a time chart showing an example of operation timing of the in-device control signal transmission circuit of FIG. 1 ... Microcomputer system, 2 ... Transmission side parallel-series signal conversion means, 3 ... Optical fiber transmission means, 4
...... Receiving side serial-parallel signal converting means, 5 …… Power supply circuit means, 7 …… Load, 8 …… Synchronous signal transmitting means, 9 ……
Synchronous signal generating means.

Claims (2)

[Claims] 1. A time-series system of a mechanical system by driving a plurality of loads by applying a plurality of control signals generated via a microcomputer system to corresponding loads via a power supply circuit means. In a device control signal transmission circuit for performing control, a transmission side parallel-series circuit configured by a parallel data buffer and a parallel data-serial data conversion unit for converting the plurality of parallel control signals into serial control signals. The optical fiber transmission means comprises a signal conversion means, an optical fiber transmission means using at least one optical fiber for transmitting the serial control signal after electrical-optical conversion, and a serial data-parallel data conversion section and a parallel data buffer. The optical control signal transmitted by the converter is converted into a parallel control signal after optical-electric conversion, and the converted control signal is input to the power supply circuit means. Side serial-parallel signal conversion means and operation timing control between the transmission side parallel-serial signal conversion means and the reception side serial-parallel signal conversion means provided on the transmission side parallel-serial signal conversion means side. A device comprising: a synchronization signal generation unit for generating a synchronization signal; and a synchronization signal transmission unit for electrically insulating the synchronization signal between transmission and reception and transmitting the synchronization signal to the reception side serial-parallel signal conversion unit. Internal control signal transmission circuit. 2. The synchronizing signal transmitting means transmits the synchronizing signal from the synchronizing signal generating means using an optical fiber after electrical-optical conversion to perform optical-electrical conversion and then to the receiving side serial-parallel signal converting means. The in-device control signal transmission circuit according to claim 1, which is configured to provide.