KR20120136246A - A communication device and a mehtod of indicating unusual signal thereof - Google Patents

A communication device and a mehtod of indicating unusual signal thereof Download PDF

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Publication number
KR20120136246A
KR20120136246A KR1020110055339A KR20110055339A KR20120136246A KR 20120136246 A KR20120136246 A KR 20120136246A KR 1020110055339 A KR1020110055339 A KR 1020110055339A KR 20110055339 A KR20110055339 A KR 20110055339A KR 20120136246 A KR20120136246 A KR 20120136246A
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KR
South Korea
Prior art keywords
signal
communication
abnormal signal
abnormal
received
Prior art date
Application number
KR1020110055339A
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Korean (ko)
Inventor
박길환
Original Assignee
엘에스산전 주식회사
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Publication date
Application filed by 엘에스산전 주식회사 filed Critical 엘에스산전 주식회사
Priority to KR1020110055339A priority Critical patent/KR20120136246A/en
Publication of KR20120136246A publication Critical patent/KR20120136246A/en

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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/048—Monitoring; Safety
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B23/00—Testing or monitoring of control systems or parts thereof
    • G05B23/02—Electric testing or monitoring
    • G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
    • G05B23/0259—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterized by the response to fault detection
    • G05B23/0267—Fault communication, e.g. human machine interface [HMI]
    • G05B23/0272—Presentation of monitored results, e.g. selection of status reports to be displayed; Filtering information to the user
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/10—Plc systems
    • G05B2219/15—Plc structure of the system
    • G05B2219/15018—Communication, serial data transmission, modem

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Human Computer Interaction (AREA)
  • Maintenance And Management Of Digital Transmission (AREA)

Abstract

PURPOSE: A communication device and an abnormal signal display method are provided to enable an operator of a device to easily recognize an abnormal signal by displaying abnormal signal detection over a normal level on the outside. CONSTITUTION: A communication connector(130) receives a signal. A communication circuit(120) converts the received signal to a processible signal. A controller(110) processes the converted signal. An abnormal signal detector(140) determines the abnormality of the received signal and notifies a result to the controller. [Reference numerals] (110) Controller; (111,112) Transmission buffer; (113,114) Transmission; (120) Communication circuit; (130,230) Communication connector; (140) Abnormal signal detector; (150) Abnormal signal display part; (210) Controller; (211) Transmission buffer; (212) Reception buffer; (220) Communication circuit

Description

A COMMUNICATION DEVICE AND A MEHTOD OF INDICATING UNUSUAL SIGNAL THEREOF}

The present invention relates to a communication device and a method for displaying the abnormal signal. More specifically, the present invention relates to an industrial control device capable of communication, such as a programmable logic controller (PLC) used in an industrial field, and to receive a signal through communication with another device, for example, another PLC, a PC, or another communication module. When the abnormal signal of the normal level or more is detected, the present invention relates to a communication device and an abnormal signal display method for displaying an external signal so that an operator of an industrial device can easily recognize whether an abnormal signal has occurred.

Programmable Logic Controller (PLC), which is a control device used in industrial sites, exchanges data with other devices through serial communication (RS-232C, RS-485).

1 is a network diagram for explaining PLC communication according to the prior art.

In FIG. 1, the communication device 100 is a PLC, and the communication device 200 may be another PLC, a PC, or any communication device or communication module. The communication device 100 and the communication device 200 may be connected to each other by a communication line 300, for example, RS-232 communication.

The communication device 100, 200 is equipped with a communication connector 130, 230 for receiving data or a signal, a communication circuit 120, 220 for converting the received signal to a processable level, and a control unit 110, 210, and the control unit 110, 210 to transmit. Transmission buffers 111 and 211 storing data, and reception buffers 112 and 212 storing received data.

In FIG. 1, Tx and Rx represent a transmission path and a reception path, respectively.

In the prior art as shown in FIG. 1, assuming that data is transmitted from the communication device 200 to the communication device 100, the communication line 300 and the signal ground (SG) connection are installed together with other power sources or are treated with the same ground. In this case, a severe noise flows into the reception signals of the communication apparatuses 100 and 200, and an abnormal reception signal flows into the reception port of the communication circuit 120 so that the control unit 110 cannot process or transmit the communication apparatus. There is a problem in that the normal response to the 200 can require a lot of maintenance time and cost depending on the industrial communication equipment.

The present invention is to solve the above problems, in a communication device such as a PLC, when receiving a signal through communication with other devices, when abnormal signal above the normal level is detected, it is displayed to the outside of the industrial device It is an object of the present invention to provide a communication device that enables an operator to easily recognize whether an abnormal signal has occurred.

Communication device according to an embodiment of the present invention, a communication connector for receiving a signal; Communication circuitry for converting the received signal into a processable signal; A control unit for receiving and processing the converted signal; An abnormal signal detection unit which determines whether there is an abnormality of a signal received by the communication connector and notifies the control unit; And an abnormal signal display unit displaying whether an abnormal signal is generated when the abnormal signal is generated under the control of the controller.

According to an embodiment of the present invention, there is provided a method for displaying an abnormal signal of a communication device, the method including receiving a communication signal; Determining whether the received signal is above a predetermined signal level; And displaying whether an abnormal signal is generated when the signal level is higher than or equal to a predetermined signal level.

According to the present invention, in a communication device such as a PLC, when an abnormal signal having a normal level or more is detected during communication with another device, the external device may be displayed externally so that an operator of an industrial device may easily recognize whether an abnormal signal has occurred.

1 is a network diagram for explaining PLC communication according to the prior art.
2 is a network diagram for explaining an operation of a communication device according to an embodiment of the present invention.
3 shows a configuration of the abnormal signal detection unit 140 according to an embodiment of the present invention.
4 illustrates a configuration of the abnormal signal display unit 150 according to an embodiment of the present invention.
5 is a flowchart illustrating an operation of a communication device according to an embodiment of the present invention.

Embodiments of the present invention will now be described in more detail with reference to the drawings.

2 is a network diagram for explaining an operation of a communication device according to an embodiment of the present invention.

In FIG. 2, the first communication device 100 may be a PLC, and the second communication device 200 may be another PLC, a PC, or any communication device or communication module. The first communication device 100 and the second communication device 200 may be connected by serial communication, for example, RS-232 communication or RS-485 communication. That is, the communication line 300 may be an RS-232 communication line or an RS-485 communication line.

As shown in FIG. 2, the first communication device 100 includes a communication connector 130 for receiving a signal, a communication circuit 120 for converting the received signal into a processable signal, and receiving the converted signal. The controller 110 to process the control unit 110, the abnormal signal detection unit 140 to determine whether there is an abnormality of the signal received by the communication connector 130, and to notify the control unit 110 according to the control of the control unit 110. An abnormal signal display unit 150 for displaying whether or not the abnormal signal is generated when the abnormal signal is generated.

The communication connector 130 is connected to the communication connector 230 of the second communication device 200 through the communication line 300. The communication connector 130 serves to transmit and receive signals.

The communication circuit 120 converts the received signal into a signal that can be processed by the controller 110, and the conversion process may include various processes such as decoding and signal level conversion.

The controller 110 controls the overall operation of the first communication device 100 and may be any computing device such as an MPU, a controller, a microcontroller, and the like. The control unit 110 receives a signal indicating whether or not the abnormal signal from the transmission buffer 111 for storing the data to be transmitted, the reception buffer 112 for storing the received data, and the abnormal signal detection unit 140. And an output terminal 114 for outputting a control signal to indicate whether an abnormal signal is present in the abnormal signal display unit.

Each component of the second communication device 200, that is, the communication connector 230, the communication circuit 220, and the control unit 210 and the corresponding components of the first communication device 100 performs the same operation.

3 shows a configuration of the abnormal signal detection unit 140 according to an embodiment of the present invention.

As shown in FIG. 3, the abnormal signal detector 140 according to an exemplary embodiment of the present invention may include an input resistor R1 connected to the communication connector 130, a photo coupler 141 transmitting the abnormal signal, and the photo signal. A current limiting resistor (R2) for preventing a current above a predetermined value from flowing through the coupler (141), and a pull-up resistor (R3) for raising a level of a voltage of the signal received by the photo coupler (141) to a predetermined level or more. do.

According to one embodiment of the invention, the values of R1, R2, R3 can be determined as follows, respectively.

The determination of R1 can be determined according to the value of the input current. Assuming that the input current is 1 (mA) and the normal input voltage is 7 (V), the value of R1 can be determined as shown in Equation 1 below.

 R1 = (voltage across R1) / (input current)

= (7-V F ) / I in = (7-1.15) / 1 = 5.85㏀ (Equation 1)

Here, V F is a voltage across the photo coupler 141 and I in is an input current.

R2 is a device that prevents the abnormal signal detector 140 from operating by preventing the photo coupler 141 from operating below a predetermined voltage. For example, at 5V or less, the photo coupler 141 may be guaranteed to be off.

The voltage across photocoupler 141 is typically 1.15V and the minimum voltage is 1.0V.

Then, R2 should have a resistance value that satisfies the following condition (Equation 2).

 5x [R2 / (5850 + R2)] <1.0 (Equation 2)

Solving above (Equation 2) gives R2 <1462 1.

R3 depends on the input voltage and the values of R1 and R2. For example, assuming that the input voltage is set to 7V, R1 is 5.85 mA, and R2 is 8.9 mA, the current flowing through R1 is 1.20 mA, and the current flowing through R2 is 0.78. mA becomes.

At this time, it is assumed that the current flowing in the photo coupler 141 is 0.42 mA, and the CTR (Current Transfer Ratio) of the photo coupler 141 is 100%.

According to the abnormal signal detection unit 140 configured as described above, when a voltage of 7V or more is detected in the received signal, a voltage higher than or equal to a predetermined value is applied to R3, and the control unit 110 monitors a voltage applied to R3 and then detects a voltage higher than or equal to a predetermined value. As a result, the LED device 151 is turned on by applying a predetermined voltage to the abnormal signal display unit 150.

4 illustrates a configuration of the abnormal signal display unit 150 according to an embodiment of the present invention.

The abnormal signal display unit 150 is connected to the output terminal 114 of the controller 110 and includes a light emitting device, for example, an LED device 151 that emits light when an abnormal signal is generated as shown in FIG. 4. In addition, it may further include a resistor (R) for limiting the current applied to the LED element 151.

5 is a flowchart illustrating an operation of a communication device according to an embodiment of the present invention. The flowchart illustrated in FIG. 5 may be performed by the controllers 110 and 210 of the first communication device 100 or the second communication device 200 of FIG. 2, and in any case, may be performed by the control unit of the receiving side. have.

In step S11, a communication signal is received.

In step S12, the signal level of the received signal is monitored. As described above, the controller 110 or 210 may monitor the signal level of the received signal by monitoring the voltage applied to R3 of the abnormal signal detector 140.

In step S13, it is determined whether the signal level is higher than or equal to the predetermined signal level. If the signal level is higher than or equal to the predetermined signal level, the signal is applied to the abnormal signal display unit 150 in step S14 to indicate that an abnormal signal has occurred. A preprogrammed processing operation is performed on the signal received in S15).

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

100: first communication device 200: second communication device
110,210: control unit 111: transmission buffer
112: reception buffer 113: control unit input terminal
114: control unit output terminal 120,220: communication circuit
130,230 communication connector 140 abnormal signal detection unit
141: photo coupler 150: abnormal signal display unit
151: LED

Claims (5)

A communication connector for receiving a signal;
Communication circuitry for converting the received signal into a processable signal;
A control unit for receiving and processing the converted signal;
An abnormal signal detection unit which determines whether there is an abnormality of a signal received by the communication connector and notifies the control unit; And
And an abnormal signal display unit which displays whether an abnormal signal is generated when the abnormal signal is generated under the control of the controller. The method of claim 1,
The abnormal signal detection unit,
An input resistor coupled to the communication connector;
A photo coupler for transmitting the abnormal signal;
A current limiting resistor for preventing a current above a predetermined value from flowing through the photo coupler; And
And a pull-up resistor for raising a level of a voltage of the signal received by the photo coupler to a predetermined level or more. The method of claim 1,
The communication connector includes at least one of rs-232 communication or rs-485 communication connector,
And the communication device is a programmable logic controller (PLC). Receiving a communication signal;
Determining whether the received signal is above a predetermined signal level; And
And indicating whether an abnormal signal is generated when the signal level is higher than or equal to a predetermined signal level. 5. The method of claim 4,
Storing the received signal in a reception buffer if the received signal is below a predetermined signal level; And
And processing the stored signal.
KR1020110055339A 2011-06-08 2011-06-08 A communication device and a mehtod of indicating unusual signal thereof KR20120136246A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020110055339A KR20120136246A (en) 2011-06-08 2011-06-08 A communication device and a mehtod of indicating unusual signal thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020110055339A KR20120136246A (en) 2011-06-08 2011-06-08 A communication device and a mehtod of indicating unusual signal thereof

Publications (1)

Publication Number Publication Date
KR20120136246A true KR20120136246A (en) 2012-12-18

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