KR19980033566A - Multiplexing transmission device - Google Patents

Abstract

The present invention relates to a multiplexed transmission device, and more particularly, to a multiplexed transmission device that enables multiplexed transmission control using a serial cable when controlling a plurality of controllers located at a remote location. The signal input unit 110 receives the signal through the light emitting diode of the photo coupler PC1 and outputs the signal to the emitter of the photo transistor, and the parallel signal input from the signal input unit 110 is shifted to be converted into a serial signal and output. The transmission control unit 120 performs serial transmission control, detects transmission error, and performs transmission error control, and transmits the shifted serial signal from the transmission control unit 120 using the photo coupler PC2 to the rated voltage source U2. A transmission module 100 including a transmission unit 130 which converts a power signal from the power supply signal to a serial communication line, and outputs the same to a serial communication line; Receiving unit 210 receives the serial signal from the photocoupler (PC5) connected to the serial communication line and outputs to the emitter of the photo transistor and the serial signal from the receiving unit 210 restored to the parallel signal The reception control unit 220 converts and outputs the reception control unit 220, and the restored parallel signal from the reception control unit 220 is amplified and converted into a predetermined power signal using the port coupler PC6 and output to each control target element. Including the receiving module 200 including the signal output unit 230, it is possible to obtain a low cost, high productivity, easy maintenance.

Description

Multiplexed Transmission Unit (APPARATUS FOR MULTIPLEX COMMUNICATION)

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multiplexing transmission apparatus, and more particularly, to a multiplexing transmission apparatus capable of restoring a plurality of signals to a serial signal line and restoring an original signal at a remote location when controlling a plurality of remote controllers.

Typically, PLC I / O wiring, automation equipment, dumb waiters, simple lifts, sugar mills, hoists and crane controls, conveyor systems, building fire and burglar detector connections, semiconductor processing equipment, injection extrusion machines, automatic balers, central Each load was controlled by transmitting a large number of ON / OFF signals in a 1: 1 wiring where intensive controllers, display panels and mosaic panels, connections between mobile and fixed devices, and ship berthing facilities were required.

However, such a conventional wiring method requires, for example, at least two wires per sensor (contact), and a minimum number of contacts (signal lines) + 1 (common line) strands when connecting multiple contacts. There is a problem in that the burden of material cost of the wiring is large, and the construction of the wiring support such as the laying of the wiring and the terminal processing and the tray is required, which requires a lot of construction time.

In addition, it takes a long time because the circuit tester checks each line at the time of inspection, there is a problem that it is difficult to trace when contact or poor strand break.

Therefore, the present invention is to solve the problems such as the high cost, low productivity, inconvenience of maintenance and inspection described above.

The present invention has been made to solve the above-mentioned conventional problems, the object of the present invention is to transmit a plurality of signals to the two-line signal line when controlling a plurality of controllers located at a remote location and restore a plurality of original signals at the remote site The present invention provides a multiplexing transmission device that can control wiring controllers to achieve cost reduction of wiring and ease of maintenance and inspection.

In the multiplexed transmission device according to the present invention, the parallel signal from a plurality of input elements is input to the light emitting diode of the photo coupler (PC1) to exclude various electrical noises mixed in the wires and suppress mutual interference, and emitters of the photo transistors. A signal input unit for outputting each of the signals, a transmission control unit for performing a serial transmission control for shifting a parallel signal inputted from the signal input unit, converting the signal into a serial signal, and outputting the serial signal, and detecting a transmission error; Transmission error state based on the transmission error control of the transmission control part which converts the shifted serial signal from the transmission control part into the power supply signal from the rated voltage source U2 using the photo coupler PC2, and outputs it to a serial communication line; Is displayed using the light-emitting diode (LED2) and the predetermined point as the relay contact (K1) A transmission module including a transmission error indication and an alarm unit for outputting an alarm signal; The receiver receives the serial signal from the transmitter by means of a light emitting diode of the photo coupler PC5 connected to the serial communication line and outputs the signal to the emitter of the photo transistor, and receives and restores and converts the serial signal from the receiver into a parallel signal. And a reception control unit for detecting a reception error to perform reception error control, and a signal output for amplifying and converting the restored parallel signal from the reception control unit into a predetermined power signal using a port coupler PC6 to output to each control target element. And a reception error display and an alarm unit for displaying a reception error state using a light emitting diode LED4 and outputting a predetermined alarm signal to the relay contact K2 based on reception error control of the reception control unit. Characterized in that made.

1 is a block diagram of a multiplexed transmission apparatus according to the present invention.

2 is a detailed circuit diagram of the transmission module of FIG.

3 is a detailed circuit diagram of the receiving module of FIG.

Explanation of symbols for the main parts of the drawings

100: transmitting module 110: signal input unit

120: transmission control unit 130: transmission unit

140: transmission error display and alarm unit

200: receiving module 210: receiving unit

220: receiving control unit 230: signal output unit

240: reception error display and alarm unit

The above objects and various advantages of the present invention will become more apparent from the preferred embodiments of the invention described below with reference to the accompanying drawings by those skilled in the art.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a multiplexing transmission apparatus according to the present invention, a transmission module 100 including a signal input unit 110, a transmission control unit 120, a transmission unit 130, a transmission error display and an alarm unit 140, It comprises a receiving module 200 consisting of a receiving unit 210, a receiving control unit 220, a signal output unit 230, a receiving error display and an alarm unit 240, multiplexing according to the present invention in Figures 2 and 3 A detailed circuit diagram for the transmission device is shown.

In such a configuration, the signal input unit 110 of the transmission module 100 is a portion for receiving signals of each input element (16 in the present invention), for example, a sensor, and the like, and the sensor state is mixed into the wire at the time of input. In order to suppress various electrical noises and suppress mutual interference, the signal from the sensor is input to the light emitting diode of the photo coupler PC1 while maintaining the insulation using the photo coupler PC1, and output to the emitter of the photo transistor. The output of the emitter is connected to the LED for display to configure the signal input status.

In addition, the transmission control unit 120 shifts each input signal input in parallel from the signal input unit 110 to convert it into a serial signal, and synchronizes the serial signal converted based on a predetermined oscillation frequency to indicate the start and end of the transmission. It outputs together and displays error status by checking communication line status and alarm control.

Meanwhile, the transmitter 130 converts the serial signal transmitted from the transmission controller 120 into a current signal and transmits the current signal to the serial communication line. In order to exclude electrical noise and mutual interference that may be mixed on the line, the photo coupler PC2 The power supply signal from the rated voltage source U2 is selectively transferred through the phototransistor of the photo coupler PC2 using the T1, and as a result, the square wave signal is output.

In detail, the transmission terminal TX of the transmission control unit 120 is connected to the base of the transistor Q1 whose emitter is grounded, the light emitting diode of the photo coupler PC2 is connected to the collector, and the photo coupler PC2 is connected. It is configured by connecting the rated voltage source (U2) to the photo transistor collector of the phototransistor, the emitter of the photo transistor of the photo coupler (PC2) is connected to the serial communication line, and the light emitting diode of the photo coupler (PC3) is connected to the photo of the photo coupler (PC2) It is connected between the transistor emitter and the serial communication line to connect the phototransistor emitter of the photo coupler (PC3) to the receiving terminal (RX) of the transmission control unit 120 to use a half-duplex communication method.

On the other hand, the transmission error display and alarm unit 140 displays a communication error state based on the display and alarm control signals of the transmission control unit 120, and transmits to the display and alarm control signals applied to the base of the transistor Q2, which is a driving driver. On the basis of this, the light emitting diode LED2 is turned on, and the relay contact K1 is connected to configure the alarm means not shown.

In addition, the receiving unit 210 of the receiving module 200 receives a signal transmitted through the serial communication line from the transmitting unit 230 of the transmitting module 100 and transmits the received signal to the receiving control unit 220 which will be described later, to be mixed on the line. Received using photo coupler PC5 to eliminate possible electrical noise and mutual interference.

In detail, the transmitting terminal TX of the reception control unit 220 is connected to the base of the transistor Q3 whose emitter is grounded, the light emitting diode of the photo coupler PC4 is connected to the collector, and the photo coupler PC4 is connected. Is connected to the photo transistor collector via a bridge diode (BD1) connected to the serial communication line, and the light emitting diode of the photo coupler (PC5) is connected to the emitter of the photo transistor of the photo coupler (PC4) and the photo coupler (PC5) The photo transistor emitter is connected to the receiving terminal RX of the receiving controller 220.

At this time, since the bridge diode BD1 is difficult to maintain the polarity of the line when the serial communication line is a long distance, the bridge diode BD1 is for matching the polarity at the receiving end using the bridge diode BD1.

In addition, the reception control unit 220 restores and outputs the serial signal applied from the reception unit 210 to the original parallel signal, and checks the communication line state to display the error state and control the alarm.

On the other hand, the signal output unit 230 is a part that receives the received signal restored as a parallel signal from the reception control unit 220 to each of the output port to output to the external control target element, the direct operation / non-operation of the control target element Function to control. This part also maintains isolation using photo coupler PC6 to eliminate electrical interference with the control object, and a light emitting diode (LED3) for indicating the state of the output signal on the emitter of the photo transistor of photo coupler PC6. ) And outputs a predetermined power supply (for example, 24V) connected to the collector of the phototransistor corresponding to the driving state of the phototransistor, and amplifies and outputs this output signal through the inverter U4. In addition, the output type can be configured to enable direct connection with various controllers by adopting a semiconductor (NPN TYPE TRANSISTOR OPEN COLLECTOR) method and a contact relay method, which are widely used throughout the industry.

In addition, the reception error display and alarm unit 240 displays a communication error state based on the display and alarm control signals of the reception control unit 220, and displays the alarm and the control signal applied to the base of the transistor Q4, which is a driving driver. On the basis of this, the light emitting diode LED4 is turned on, and the relay contact K2 is connected to configure the alarm means not shown.

Next, an operation process of the multiplexing transmission apparatus according to the present invention having the above-described configuration will be described in detail.

First, when input signals from a plurality of input elements (not shown) are respectively applied to the signal input unit 110, the signal input unit 110 may exclude noise through an input wire using a photo coupler PC1 provided for each channel. The input signal is output to the reception controller 120 while suppressing mutual interference.

In other words, the photo transistor is turned on by light emission of the light emitting diode of the photo coupler PC1 hung in the forward direction on the common line with the corresponding channel CH1, and the predetermined power supply Vcc applied to the collector of the photo transistor is transmitted through the emitter. The signal input state may be confirmed by the display LED LED1 output to the controller 120 and connected to the emitter of the photo transistor of the photo coupler PC1.

Next, the transmission control unit 120 converts the parallel signal applied from each signal input unit 110 into a serial signal and outputs the serial signal to the transmission unit 130 through the transmission terminal TX.

In detail, the transmission control unit 120 is initialized by the operation congestion monitoring timer U1 when the internal CPU stops the operation due to the disturbance during the operation or performs the operation indefinitely, and is based on the reference time from the reference signal generator Y1. To generate a synchronization signal for detecting the start of data in the communication between the parent and the local station, and outputs the synchronization signal to the transmitter 130, and shifts the parallel signal input from each signal input unit 110 into a serial signal. Output to 130.

At this time, the input signal is temporarily stored during operation of the input signal, and after each transmission is completed, the data is updated after initialization, and when the serial signal is output, a binary digit is used to serialize the data read from the signal input unit 110. It outputs 1 bit by using movement operation, and 8 digit shifts are required for 1 BYTE transmission.

On the other hand, the faster the reference time for communication, the faster the transmission speed and the signal transmission delay time is reduced, but too fast is set to an appropriate speed because it is vulnerable to external electrical noise and may cause a malfunction.

Next, the transmitter 130 transmits the serial signal including the synchronization signal from the transmission controller 120 to the remote reception module 200 through the serial communication line.

In detail, the transistor Q1 is turned on / off in response to whether the signal from the transmission terminal TX is applied, and the photo coupler PC2 is driven in response to the driving of the transistor Q1 to supply the rated voltage source U2. Since the signal is output through the serial communication line, the serial signal of the TTL level is converted into the current signal of the rated voltage source U2 level and eventually output.

At this time, the communication state can be confirmed by a signal applied to the receiving terminal RX of the transmission control unit 120 through the photo coupler PC3, and the error state of the communication line can be confirmed.

Meanwhile, if it is determined that the serial communication line is short-circuited or disconnected due to an accident by checking the transmission terminal TX and the reception terminal RX, the transmission control unit 120 transmits a predetermined signal to the transmission error display and alarm unit 140. In this case, the light emitting diode LED2 having a small current consumption and heat generation of the transmission error display and the alarm unit 140 is turned on by driving the transistor Q2, and the relay contact K1 is contacted to output a predetermined alarm signal. Thus, the maintenance and inspection of the communication error state can be confirmed without a separate tool.

Next, the receiving module 200 restores the serial signal applied from the transmitting module 100 to the original parallel signal to control each control element, not shown. First, the receiving unit 210 is applied through the serial communication line. The serial signal is received and applied to the reception controller 220.

In detail, the transistor Q3 is turned on based on the high level signal applied from the transmission terminal TX of the reception control unit 220 when the reception waits, so that the photo coupler PC4 is driven and applied through the serial communication line. The serial signal passes through the bridge diode B1 and is applied to the light emitting diode of the photo coupler PC5.

At this time, the photo transistor of the photo coupler PC5 is driven in response to the light emission driving of the light emitting diode of the photo coupler PC5, and the serial signal converted into the TTL level through the emitter of the photo transistor is received by the receiving terminal of the receiving controller 220. Is applied via (RX).

Then, the reception control unit 220 starts reception immediately after detecting the synchronization signal. The reception control unit 220 reads and receives the voltage of the reception terminal RX in accordance with the reference time generated by the internal reference time generation unit Y2 to reduce the error. In order to do this, normally, N times are read and an average value is used.

In addition, error correction is performed by detecting whether the received data deviates from the data arrangement rule by using a stop signal and a parity signal included in the serial signal.

Next, the reception control unit 220 restores the serial data received through the above-described process to parallel data, and applies them to the signal output unit 230 to which each control target element is connected, and temporarily stores the last received data. The data is updated and stored immediately after each reception, and the serial communication line keeps the output signal as old data to prevent accidents.

Next, the signal output unit 230 applies a signal applied from each output terminal of the reception control unit 220 to each control target element (not shown) through the photo coupler PC6 and the inverter U4, and the transmission module Similar to the transmission error display and the operation of the alarm unit 140 of 100, the reception error display and the alarm unit 240 of the reception module 200 also display an error state in the event of a communication failure under the control of the reception control unit 220. It displays through (LED4) and outputs alarm signal through relay contact (K2).

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

As described above, the multiplexing transmission apparatus of the present invention can be simply adopted in all parts of the industry where a large number of electrical signals are required, thereby reducing the material cost of the wiring by eliminating the need for a dedicated wiring support and a plurality of wirings. In addition, it is possible to shorten the working time and the operator or the manager can easily track and repair the communication error status such as disconnection and poor contact.

Claims (5)

The signal input unit 110 receives the parallel signals from a plurality of input elements through a light emitting diode of the photo coupler PC1 to exclude various electrical noises mixed in the wires and suppresses mutual interference, and outputs them to the emitters of the photo transistors, respectively. Wow, A transmission control unit 120 performing serial transmission control for shifting a parallel signal input from the signal input unit 110, converting the parallel signal into a serial signal, and outputting the serial signal; Transmission module 100 including a transmission unit 130 for converting the shifted serial signal from the transmission control unit 120 to a power supply signal from a rated voltage source U2 by using a photo coupler PC2 and outputting the serial signal to a serial communication line. )and; A receiver 210 which receives the serial signal from the transmitter 130 through a light emitting diode of a photo coupler PC5 connected to a serial communication line and outputs the signal to an emitter of a photo transistor; A reception control unit 220 which performs reception control of restoring and converting the serial signal from the reception unit 210 into a parallel signal; Receiving module 200 including a signal output unit 230 for amplifying and converting the restored parallel signal from the reception control unit 220 to a predetermined power signal by using the porter coupler PC6 Multiplexed transmission device comprising a. According to claim 1, Transmission error display for displaying the transmission error status using the light emitting diode (LED2) based on the transmission error control of the transmission control unit 120 and outputs a predetermined alarm signal to the relay contact (K1) and Multiplex transmission device further comprises an alarm unit (140). The method according to claim 1 or 2, wherein the reception error state is displayed by using the light emitting diode LED4 based on the reception error control of the reception control unit 220, and a predetermined alarm signal is output to the relay contact K2. Multiplex transmission device further comprises a reception error display and alarm unit (240). According to claim 1, Porter coupler (PC3) between the porter coupler (PC2) and the serial communication line of the transmission unit 130 by further comprising a light emitting diode of the porter coupler (PC3) and the porter coupler (PC2) transistor and the And a photo transistor emitter output of the photo coupler (PC3) to be connected to the transmission control unit (120). According to claim 1, Between the serial communication line and the porter coupler (PC5) of the receiver 230, the bridge diode (BD1) connected to the serial communication line, and the signal from the bridge diode (BD1) receiving control unit 220 And a porter coupler (PC4) for selectively passing under control of the < RTI ID = 0.0 >). ≪ / RTI >