JPS619040A - Transmission circuit of control signal in equipment - Google Patents

Abstract

PURPOSE:To attain high reliability of control signal transmission by using an optical fiber and transmitting a synchronizing signal after electrooptic conversion and giving the signal to a serial/parallel signal converting means after optoelectric conversion. CONSTITUTION:After a control signal from a microcomputer system 1 is converted into a serial signal by a time division means electrically, the result is transmitted to the vicinity of a load 7 by an optical fiber transmission means 3 and a serial-parallel signal converting means 4 is provided so as to apply plural parallel signals to a power supply circuit means 5 to a drive system near the load 7. As the serial signal supply means to the optical fiber 3b, a parallel-serial signal converting means 2 connected directly to a bus of the microcomputer system 1 is used. In order to take the converting synchronism of both the transmission and reception systems, a synchronizing signal generating means 9 is provided at the transmission side and a synchronizing signal from the synchronizing signal generating means 9 is applied to a parallel-serial signal converting means 2 at the transmission side and a serial-parallel signal converting means 4 at the reception side. Then the synchronizing signal to the reception side is transmitted from the transmission side to the reception side via a synchronizing signal transmission means 8 incorporated with an electric signal insulating means optical fiber.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to internal control signal transmission circuits, and in particular to automatic analyzers and the like suitable for simplifying intermediate wiring and increasing the reliability of signal transmission. This invention relates to an in-device control signal transmission circuit.

[Background of the invention]

The conventional in-device control signal transmission circuit is entirely electrically processed using 7-rat cables and individual wiring. [Object of the Invention] The present invention has been made in view of the above, and its purpose is to An object of the present invention is to provide an in-device control signal transmission circuit that can simplify wiring, provide electrical insulation between transmitting and receiving sections, and achieve high reliability of control signal transmission.

[Summary of the invention]

The present invention is characterized by comprising: a parallel-to-serial signal converting means for converting a plurality of parallel control signals into a serial control signal; and at least one optical fiber serving as an electric-to-optical conversion transmitter for the serial control signal. The optical fiber transmission means used and the optical control signal transmitted by the optical fiber are subjected to optical-to-electrical conversion, and the series control signal is converted into a parallel control signal and input into the power supply circuit means for driving the load. A parallel signal converting means, and installed on the side of the parallel-to-serial signal converting means for generating a synchronization signal for controlling operation timing between the parallel-to-serial signal converting means and the serial-to-parallel signal converting means.
digit synchronization signal generation means and the above synchronization signal between sending and receiving? Another feature of the present invention is that it includes a synchronizing signal transmission means for electrically insulating the signal and transmitting it to the serial-to-parallel signal conversion means.

[Embodiments of the invention]

The present invention will be described in detail below with reference to the embodiment shown in FIG. 1 and FIG. 2.

FIG. 1 is a block diagram showing an embodiment of the in-device control signal transmission circuit of the present invention. In FIG. 1, 1 is a microcomputer system, 2 is a transmission-side parallel-to-serial signal converter for converting a control signal from the microcomputer system from parallel to serial, and is composed of a tltJtl data buffer 2a and a parallel data-to-serial data converter 2b; Optical fiber transmission means for transmitting serialized control signals from the parallel-to-serial signal conversion means 2 consisting of an electric-to-optical conversion transmitter 3a, an optical fiber 3b, and an optical-to-electrical converter and transmitter 3C, 4 is serial data parallel data Receiving side serial-to-parallel signal converting means for converting the received signal from the optical fiber transmission means 3 from serial to parallel, consisting of a converter 4a and a parallel data buffer 4b; 5 is a power supply; 11 circuit means;
Reference numeral 6 denotes a power supply section that supplies power to the serial-parallel signal conversion means 4 and the power supply circuit means 5, 7 is a load, 8 is an electric-to-optical conversion transmitting section Ba, an optical fiber 8b, and an optical-to-electrical conversion receiving section 8C. Reference numeral 9 denotes a synchronization signal generating means consisting of an oscillation means 9a and a synchronization control circuit means 9b which send a synchronization signal to the parallel-to-serial signal conversion means 2 and the synchronization signal transmission means 8.

In FIG. 1, a control signal from a microcomputer system 1 is electrically converted into a serial signal by a time division means, and then transmitted to a load (pulse motor, solenoid valve, AC motor, light emitting diode, etc.) by an optical fiber transmission means 3. 7
The control wiring system has a configuration in which a serial-to-parallel signal conversion means 4 is provided so that a plurality of parallel signals can be transmitted close to the load 7 and supplied to the power supply circuit means 5 for the drive system near the load 7, As a serial signal supply means to the optical fiber 3b, c.
Parallel-to-serial signal conversion means 2 that can be directly connected to the bus of the microcomputer system 1 (for example, Hitachi HD46850
There are some that can be realized with a siprogram using an LSI such as 1-2, and some that have a built-in parallel data bus buffer and parallel-to-serial signal conversion function. (using a software configuration).

In order to synchronize the conversion of both transmitting and receiving systems, a synchronizing signal generating means 9 is provided on the transmitting side, and the synchronizing signal from the synchronizing signal generating means 9 is transferred to the transmitting side parallel-serial signal converting means 2 and the receiving side serial-parallel signal. In addition, the synchronization signal to the receiving side is supplied to the converting means 4 using an electrical signal isolating means (for example, an optical signal transmitting means using a photocoupler, an insulating transformer, or an optical fiber, etc., but in this embodiment, an optical signal is supplied to the receiving side. Synchronous signal transmission means 8 with built-in Aino
The data is transmitted from the sending side to the receiving side via the .

FIG. 2 shows an example of the operation timing of the intra-device control signal transmission circuit configured as described above. However, to simplify the explanation, the case where the number of transmission points is 10 is illustrated as an example, but in reality, it is common to transmit signals of 4d50 to 200 or more points.

First, as shown in FIG. 2(a), the scanning period Tl of the synchronizing signal is selected from the minimum time requirement for the control timing from the load side. Here, TI = 100
When set to ms, the parallel signal on the transmitting side is scanned every iooms period, and the scanning result is converted into a serial signal and sent to the optical fiber transmission means 3. Each scanning interval t1 from individual signals CHI to CHIO in TI shown in (in the same figure) is as follows.
Since the number of transmission points is 10, the scanning period T1 = 100m
s, it may be set to 10ms. That is, each state ("0" or "11") of the individual signals CHI to CHIO is sampled sequentially, and from the output section of the receiving side serial-to-parallel signal converting means 4, the received signal is output as a received signal (C
), the same slam signal as the transmission signal shown in (d) of the figure is output (regenerated) with a maximum time lag of T1 and is used to drive the load.

As described above, a unidirectional synchronous transmission method is carried out from the microcomputer system 1 to the power supply circuit means 5 via a signal isolation system using two optical systems, the optical fiber transmission means 3 and the synchronous signal transmission means 8. By transmitting the signals, it becomes possible to drive various loads with high reliability.The details will be explained below. On the transmitting side, a parallel data buffer 2a and a parallel data-serial data converter 2 are provided.
Parallel-to-serial signal converting means 2 and synchronizing signal generating means 9 are used, which are configured by hardware consisting of b. However, if a serial communication control LSI (for example, Hitachi HD46850, etc.) is used, these elements are as follows. All of them can be built into one LSI and can function as part of the microcomputer system 1. It also becomes possible to control the functions of all systems on the transmitting side using software. Therefore, if an LSI is used, the circuit configuration on the transmitting side is
The illustrations are also simplified.

The receiving side serial-to-parallel signal conversion means 4 converts serial data into
However, the operation of these circuits is controlled from the transmission side via the synchronization signal transmission means 8, so there is no communication between the transmission side and the transmission side. M corresponds to one-to-one operation. The above-mentioned Hitachi HD46850 can be used as the serial data-parallel data converter 4a, and since it can output 8-pin data, this 8-pin data converter 4a can be used.
If the focus data is transferred to a general-purpose parallel output LSI (such as the Hitachi HD46821) used as the parallel data buffer 4b, 16 output wires can be taken out per HD46821, reducing the load on the control system. By dispersing the parallel data buffers 4b nearby, even if there are many loads, the power supply circuit means 5 and the power supply circuit means 5 used as drivers can be mounted on the same printed circuit board. By mounting it in tandem with the parallel data buffer 4b, it is possible to avoid having to route individual signal lines, and it is possible to make the driver compact and sufficiently safe in terms of noise resistance. .

Note that the purpose of the parallel data buffer 4b is to store the decoded signal only during the scanning time of T1, but if the loads are scattered at multiple locations, individual parallel data buffers may be used. For each 4b, circuit means necessary for decoding: For example, a circuit means having a function of performing chip selection is required. For this purpose, the reception control section -
will be established.

Various signals necessary for one operation of the reception and reception control section are appropriately taken in from the serial data-parallel data conversion section 4a, the synchronous signal transmission means 8, etc., so that timing control suitable for the operation of the entire data transmission system can be performed. .

Further, as the synchronization signal transmission means 8, an optical fiber transmission method having an optical system or electromagnetic electric insulation means, a simple transmission method combining a photocoupler and electric wiring, etc. are used, but the electric-optical The conversion transmitting section 3a, the optical fiber 8b, and the optical-to-electrical conversion receiving section 8C are shown, but it is preferable to select one of them as appropriate depending on the electromagnetic noise generation state of the usage environment. According to the embodiments of the present invention described above, there are the following effects.

! Since the optical fiber transmission means 3 and the synchronization signal transmission means 8 using optical fibers are used to transmit signals and synchronization signals to the vicinity of the microcomputer system III color load 7, electromagnetic interference noise can interfere with the sidigital signal circuit. This eliminates the need for countermeasures against pulsed electromagnetic noise and electrostatic interference. For this reason,
The reliability of the mechanism control system of the system can be significantly improved.

2. In case of internal wiring where the number of electrical wiring is 100 to 300, it can be replaced with two optical fibers or one optical fiber and one optically insulated electrical wiring, which saves wiring space. #1 It is almost unnecessary, and it is possible to downsize the equipment.

1. Since there is no problem even if the power supply line and the signal line are wired in a bundle, there is no need for a wiring duct or hardware for wiring separation, and the structure can be simplified.

J4. An extremely small amount of wiring material is required, making it possible to reduce costs.

5. Since it is not affected by electrical noise, the wiring route does not matter, the work can be simplified, and the number of wiring steps can be significantly reduced.

Note that the in-device control signal transmission circuit according to the present invention mainly includes:
Since it is most effective when there are many loads such as pulse motors and relays connected to digital output, it is suitable for use in analytical instruments such as automatic blood analyzers and physical and chemical instruments.

Furthermore, it can be used as a signal transmission means in control devices in other fields, especially when used in places with a lot of electromagnetic noise.

Also, a high frequency switching signal, for example, 20KH2
In the transmission of processed signals such as pulse width modulation as described above, if several meters of electrical wiring is used, electromagnetic waves will be radiated, which is undesirable from the viewpoint of various EMI protections. In this case, it is preferable to use the in-device control signal transmission circuit according to the present invention, since radiation of electromagnetic waves can be avoided, such as when the electrical wiring is short.

l-=″AcDfiJIL)
f As explained above, according to the present invention, the intermediate wiring can be simplified, electrical insulation between the transmitting and receiving parts can be achieved, and high reliability of signal transmission can be realized.

[Brief explanation 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 the operation timing of the in-device control signal transmission circuit of FIG. DESCRIPTION OF SYMBOLS 1... Microcomputer, computer system, 2... Transmission side parallel-serial signal conversion means, 3... Optical fiber transmission means, 4... Receiving side serial-parallel signal conversion means, 5...
- Power supply circuit means, 7... Load, 8... Synchronous signal transmission means, 9... Synchronous signal generation means.

Claims (1)

[Claims] 1. A mechanical system by driving a plurality of loads by applying a plurality of control signals generated via a microcomputer system to the respective loads via a power supply circuit means. An in-device control signal transmission circuit configured to perform time-series control of the plurality of parallel control signals, comprising a parallel-to-serial signal conversion means for converting the plurality of parallel control signals into serial control signals; an optical fiber transmission means using at least one optical fiber that transmits after electrical-to-optical conversion; and an optical fiber transmission means using at least one optical fiber to transmit the optical control signal after the optical-to-electrical conversion, converting the serial control signal into parallel control signals. a serial-to-parallel signal converter for converting and inputting the converted signal to the power supply circuit means; and the parallel-to-serial signal converter for generating a synchronizing signal for controlling operation timing between the parallel-to-serial signal converter and the series-to-parallel signal converter. A device comprising a synchronizing signal generating means provided on the signal converting means side, and a synchronizing signal transmitting means for electrically insulating the synchronizing signal between the sending and receiving sides and transmitting the synchronizing signal to the serial-parallel signal converting means. Internal control signal transmission circuit. 2. A patent wherein the synchronization signal transmission means is configured to transmit the synchronization signal from the synchronization signal generation means using an optical fiber after electrical-to-optical conversion, and provide the synchronization signal to the serial-parallel signal conversion means after optical-to-electrical conversion. An in-device control signal transmission circuit according to claim 1.