KR950002062Y1 - Stabilization circuit for systems - Google Patents

Abstract

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Description

Output stabilization circuit of the system

1 is a conventional system output circuit diagram.

2 is a system output stabilization circuit diagram of the present invention.

(A) to (h) of FIG. 3 are operation waveform diagrams of parts of FIG.

* Explanation of symbols for main parts of the drawings

1: Data input part 2: Latch part

3: transistor array 4: latch control part

5: output control unit 6: device control unit

10: system control unit 20: field control unit

PC ₁ -PC _n , PC ₁₁ -PC ₁₃ : Photocoupler AND ₁ : Endgate

R ₁ -R ₃ : Resistance

The present invention relates to a digital output board of a system, and more particularly, to an output stabilization circuit of a system that is suitable for improving the reliability of a system by maintaining a normal operation state by supplying a stable control signal to an on-site control unit when an error occurs in the control system. will be.

In general, the field control unit is controlled by the digital output signal of the system control unit. An interface mode between the system control unit and the field control unit controls mutual transmission.

1 is a system output circuit diagram of the related art, as shown therein, a system control unit 10 in charge of controlling a system and a site bearing unit 20 controlling a field device by a control signal of the system control unit 10. The system control unit 10 receives the data input unit 1 for inputting data into the system by driving the photocouplers PC _{1 to} PC _n according to data input, and receives the input data of the data input unit 1. Comprising a transistor array (3) for outputting the corresponding data, the field controller 20 is applied to each of the output signal of the transistor array (3) device control unit (6-1) to control the field equipment 6-n).

Referring to the operation process and problems of the conventional system output circuit configured as described above are as follows.

When data for controlling the operation of the field apparatus is input to the data input terminals D ₁ -D _n of the data input unit 1, the data is applied to the transistor array 3 through the photocoupler PC _1- PC _n .

In this case, when the high potential signal is applied to the data input terminal D ₁ of the data input unit 1, the photocoupler PC ₁ is turned off, which causes the transistor array 3 and the device control unit. When the closed circuit is not formed between the devices 6, the device controller 6 of the field controller 20 does not operate, and light is emitted when a low potential signal is applied to the data input terminal D ₁ of the data input unit 1. The light emitting diode emits light, the phototransistor conducts, and the photocoupler PC ₁ conducts. A closed circuit is formed between the transistor array 3 and the device control unit 6 of the field control unit 20. The device control unit 6 To operate the equipment in the field.

By changing the data as described above, the device in the field is operated as a whole.

When the output circuit of the system operating as described above is abnormal due to the reset state of the digital output board or the failure of the operation power of the corresponding output board in the process of controlling the field device in the system control unit, There was a problem of causing a great damage to the product to reduce the reliability of the system.

In view of the conventional problems described above, the present invention latches the data applied to the field controller by the latch controller, the output controller, and the reset controller to normal data when the output board does not operate normally, such as an error in the power failure system controller. In the event of an error, it is intended to improve the reliability of the system by inducing the normal operation of the field controller.

FIG. 2 is a system output stabilization circuit diagram. As shown in FIG. 2, the system controller 10 is in charge of controlling the system, and the field controller 20 controls the field device operation by the control signal of the system controller 10. It is composed.

The system controller 10 applies a data input unit 1 for driving data to the system by driving photocouplers PC _{1 to} PC _n according to data inputs, and output data of the data input unit 1 to receive a transistor array. A latch section 2 for driving a latch and latching data when an abnormality occurs, a latch control section controller 4 for controlling a latch of the data output of the latch section 2 to the photocoupler PC ₁₁ by an interrupt signal, and An output control unit 5 for controlling the output of the latch unit 2, a reset control unit 6 for receiving a reset signal and controlling a reset of the latch control unit 4, and the latch unit 2 The transistor array 3 receives data and outputs the corresponding data, and the field controller 20 receives the transistor array 3 output data of the system controller 10 to control operation of field devices. Device controllers 6-1 to ( 6-n).

The operation process and the effect of the present invention system stabilization circuit configured as described above will be described in detail with reference to FIG.

First of all, in case of normal operation without any abnormality in the system, the reset terminal of the reset controller 6 ), A high potential signal is applied to the output enable terminal OE of the output controller 5 as in FIG. 3 (a), and a high potential signal is applied to the output enable terminal OE of FIG. When the low potential state is applied to the data input terminal D ₁ of the input unit 1 in the same manner as in FIG. 3B, the photocoupler PC ₁ is turned on and the data input terminal D _{n of} FIG. When a high potential state is applied, the photocoupler PC _n is turned off.

As a result, the photocoupler PC ₁₃ of the reset control unit 6 is turned on and outputs a high-potential signal in the same manner as in (d) of FIG. 3 of the AND gate AND ₁ , so that the light-emitting diode cathode of the latch control unit 4 When a high potential signal is applied to the photocoupler PC ₁₁ , the photocoupler PC ₁₁ is turned off, and the strobe terminal of the latch portion 2 ( ) Is applied with a signal of the same high potential as in (e) of FIG.

As a result, the data input unit 1, the latch unit 2, the transistor array 3, and the device control unit 6-1 of the field control unit 20 operate in a closed circuit, and the device control unit 6-n operates a closed circuit. It does not work because it cannot be configured.

In the meantime, when an abnormality occurs in the system, it is as follows. The high potential state and the low potential state are respectively applied to the data input terminals D ₁ and D _n of the data input unit 1 in the same manner as in FIGS. 3B and 3C. Reset terminal If the reset signal is a signal of a low potential state as in (f) of FIG. 3, the AND gate AND ₁ of the reset control unit 6 is in a low potential state of (d) in FIG. Is applied to the light emitting diode cathode of the latch control section 4. As a result, the photocoupler PC _n is turned on so that the strobe terminal of the latch portion 2 ( ) Is applied to the high potential signal.

At this time, the latch unit 2 does not latch new data, but instead of the data input terminals D ₁ and (D _n ) of the data input unit 1 (D _n ), the signals of the high potential and low potential states, which are the previous data, are shown in FIGS. Output the same as (h) and control the device control unit 6 of the field control unit (2c) to maintain the normal operation of the field device, and then the strobe terminal ( When a high potential signal is applied to the circuit, normal operation is performed by the data value of the data input unit 1.

As described in detail above, the output stabilization circuit of the present invention system may return to the data before the occurrence of abnormality due to the operation of the reset control unit and the data control unit when an abnormality occurs in the system or when the field control unit cannot be normally controlled by data due to noise. By latching, the production line can be normally operated by the normal control of the field control unit, thereby improving the reliability of the system.

Claims (3)

The system control unit 10 outputs a control signal corresponding to the transistor array 3 according to the data of the data input unit 1, and the device control unit 6 controls the field device by the control signal of the system control unit 10. In the system output circuit composed of the field control unit 20 for controlling, a latch unit 2 for latching data applied from the data input unit 1 to the transistor array 3, and an output of the latch unit 2 is controlled. Output latch 5 for controlling, reset controller 6 for controlling the reset of the latch unit 2, and data latch of the latch unit 2 according to the control signal of the reset controller 6 Output stabilization circuit of the system comprising a latch control unit (4) for controlling the. The output stabilization circuit according to claim 1, wherein the output control section (5) comprises a photocoupler (PC ₁₂ ). 2. The output stabilization circuit according to claim 1, wherein the latch control section (4) comprises an end gate (AND ₁ ) and a photo coupler (PC ₁₁ ).