KR100292258B1 - Signal transmission apparatus for elevator - Google Patents

Abstract

PURPOSE: A signal transmitting device of an elevator is provided, thereby the problems and disorders can be self-diagnosed. CONSTITUTION: The signal transmitting device of an elevator serially transmits the signals from an elevator-controlling device(401) with a network transmission controlling device, car controlling device(407) with a network transmission controlling device, and multiple elevator controlling devices(403-406) into each device, wherein the car controlling device(407) and multiple elevator controlling devices(403-406) are composed of a problems and disorders detecting means which detects the problems and disorders in a transmission line; an one chip processor which supervises the program status and prints the problems and disorders detecting signal; and a transmission line separating means which separates the transmission line from itself when the numbers of problems and disorders detected are over.

Description

Signal Transmitter of Elevator {SIGNAL TRANSMISSION APPARATUS FOR ELEVATOR}

The present invention relates to a technique for properly coping with a local failure in a system that forms a serial signal transmission system in a network form in each control period of an elevator, and in particular, the function of the entire network due to the local failure of each controller in the network. The present invention relates to a signal transmission device of an elevator that can be prevented from being exerted or deteriorated.

In recent years, microcomputers have been applied to each control device of an elevator system to enable their subdivision and miniaturization. In addition, a high-speed or high-capacity signal transmission system is formed between the respective control devices, and the control function of the elevator may also be distributedly processed by each control device in a suitable place. There is an example of building a local area network (LAN) in an elevator system for such high speed and large capacity real time signal processing. In particular, in the case of an elevator system in order to control the input and output to the platform or elevator car side, a serial signal transmission system is essentially required, and many studies have been actively conducted to satisfy these requirements. In addition, many techniques have been proposed to secure the reliability of serial communication in such a serial signal transmission system.

The present invention particularly relates to an elevator signal transmission system that directly affects the performance of an elevator control system, and is particularly suitable for preventing malfunction or degradation of the entire network due to local failure of each controller in the network.

1 is an overall block diagram of a serial information transmission system in an elevator control system according to the prior art, as shown in FIG. 1, to communicate with terminal devices on a car side and a floor through an input / output transmission control device 102 to be described later. And elevator control device 101 for controlling the overall operation of the elevator; A serial transmission system is constructed through car input / output terminal devices 105A and 105B and network transmission line L30B, which will be described later, and layered input / output terminal devices 106A and 106B and a separate network transmission line L30A are connected. An input / output transmission control device (102) for establishing a serial transmission system through the control unit; A network transmission control device (103) for forming a serial transmission system with the elevator control device (101) through a user command terminal device (104) and a network transmission path (L30), which are separate devices managed at a distance; A car input / output terminal device 105A for controlling the input / output of the service guide panel 107A related to the service of the elevator; A car input / output terminal device 105B for controlling the input to the destination floor indicator 107B in or inside the car of the elevator; A layered input / output terminal device 106A for controlling the input / output of the guide indicator 108A or the hall call button 108B; The layered input / output terminal device 106B for controlling the input / output of the guide indicator 109A or the hall call button 109B.

FIG. 2 is a detailed block diagram of a layered input / output terminal in FIG. 1, and a one chip processor 201 for collectively controlling input and output of a guide indicator or a hall button on the corresponding floor; A transmission circuit 202 which is controlled by the one chip processor 201 and outputs data outputted from the one chip processor 201 to a signal transmission pulse transformer T1 connected to the network transmission path L3OA; A receiving circuit 203 for receiving data input through the signal transmission pulse transformer T1 and outputting the received data to the one chip processor 201; An output circuit 204 for receiving and outputting data output from the one-chip processor 201 and outputting it to an in-car or platform-side indicator and an input circuit 206 for processing data output from the indicator and outputting the data to the one-chip processor 201. , 207; A watchdog timer 208 for monitoring a program processing operation of the one-chip processor 201; Referring to Figure 3 attached to the operation of the conventional elevator signal transmission system configured as a memory circuit 209 for storing the output information of the watchdog timer 208 as follows.

The network transmission control device 103 forms a serial transmission system with the elevator control device 101 through the user command terminal device 104 and the network transmission path L30, which are separate devices managed at a long distance, and input / output transmission control device. Reference numeral 102 is a floor input / output terminal device 106A for controlling input / output of guide indicators 108A, 109A, etc. or input of hall buttons 108B, 109B related to elevator operation in a plurality of platforms. 106B) and a network transmission line (L30A) to establish a serial transmission system.

In addition, the network transmission control device 103 may be present in a plurality of car input and output terminal device 105A to control the input and output of the service guide panel 107A, destination floor indicator 107B, etc. in the car inside or above the elevator car. ) And 105B and a serial transmission system through a network transmission path L30B.

Herein, the operation of the layered input / output terminal devices 106A and 106B will be described in more detail with reference to FIGS. 2 and 3.

The watchdog timer 208 performs a monitoring function for program processing of the central processing unit 201A in the one-chip processor 201. That is, the watchdog timer 208 turns out that the central processing unit 201A does not monitor and output the changed output pulse WDTP to the output terminal Q7 of its parallel communication output port PO22 on a regular basis. When the abnormality detection signal S is generated, the abnormality detection signal S generated on the one hand is supplied as a reset signal to the central processing unit 201A on the one hand, and the memory circuit 209).

Accordingly, the memory circuit 209 outputs the transmission control signal TXEN to the transmission circuit 202 through the output terminal Q, thereby transmitting from the one chip processor 201 to the network transmission path L30A. The signal to be cut is cut off at the transmitting circuit 202.

The signal blocking operation in the transmission circuit 202 will be described in more detail with reference to FIG. 3 as follows.

The signal blocking operation is performed by the transistor Q1. That is, the abnormality detection signal S output from the watchdog timer 208 is stored in the memory circuit 209 and the transistor Q1 is transmitted by the transmission control signal TXEN output from the memory circuit 209. Is off.

Here, the transistor driving circuit 301 is driven by the transmission data TXDATA and the clock signal CLK outputted from the serial input / output port SIO21 of the one-chip processor 201, whereby the transistors Q2 and Q3. ) Is continuously driven, but if the transistor Q1 is not driven, the signal transmission pulse transformer T1 is not driven. Consequently, no further signal is output to the network transmission line L30A.

As described above, in the conventional elevator signal transmission apparatus, the watchdog timer, which is an error detection means, has little consideration for the network transmission path, and thus, when an abnormality occurs in the network transmission path, it is impossible to take appropriate measures. There was a problem. In addition, until the watchdog timer detects an abnormality, the possibility of transmitting data to the network transmission path, that is, the possibility of disturbing the network transmission path, cannot be completely excluded. After detecting the abnormality, the transmission circuit is blocked and the central processing unit is turned off. It has a self-resetting function to reset, but there was a problem that the process is repeated repeatedly. Because most failures are permanent.

Therefore, the technical problem to be achieved by the present invention is to enable any device connected to the network transmission path to detect abnormality and magnetic failure for the network transmission path, and when the error or magnetic failure is repeated several times or more, The present invention provides an elevator signal transmission device that permanently separates a device from a management object.

1 is an overall block diagram of an elevator serial information transmission system according to the prior art.

FIG. 2 is a detailed block diagram of the layered input / output terminal in FIG. 1. FIG.

3 is a detailed circuit diagram of the transmission circuit in FIG.

4 is a block diagram of an elevator network serial transmission system according to the present invention.

5 is a detailed block diagram of a network transmission control apparatus in FIG. 4;

6 is a detailed block diagram of a car control device or a platform control device.

7 is a detailed circuit diagram illustrating an embodiment of the transmission control unit.

*** Description of the symbols for the main parts of the drawings ***

401: elevator control unit 402: network transmission control unit

403-406: Platform control device 407: Car control device

4 is a block diagram of a network serial transmission system in an elevator control system to which the present invention is applied, and as shown therein, an elevator control device 401 for collectively controlling the operation of an elevator car; On the one hand, it performs parallel communication with the elevator control device 401 through the dual port RAM, and on the other hand, the platform control device 403-406 and the car control device 407 through the network transmission path 11L. A network transmission control device 402 for establishing a network serial transmission system; Platform control device for controlling the input and output of the guidance call associated with the hall call signal or elevator operation generated in a plurality of platforms, and blocks the network transmission path (11L) when the number of failures is counted and the predetermined number of times is exceeded. 403-406); Control the input of the destination floor indicator 407B in the car or the inside of the elevator and the input / output of the guide indicator 407A related to the service of the elevator and count the number of failures to exceed the preset number of times. The car input / output control device 407 cuts off the transmission path 11L.

FIG. 5 is a detailed block diagram illustrating an embodiment of the network transmission control apparatus 402 in FIG. 4. As shown in FIG. 4, an internal watchdog timer is periodically executed by a program processed by an internal CPU. A one-chip processor 501 which is reset so as to perform a monitoring function for program processing of the central processing unit by itself; The signal transmission pulse transformer T51 is connected to the network transmission path 11L and, on the other hand, is connected to the one-chip processor 501 and there is an abnormality of the network transmission path 11L or the one-chip processor 501. A transmission control unit 502 for determining the control and controlling the connection to the network transmission path 11L; A dual port RAM 503 connected to the one chip processor 501 to perform parallel communication of data with the elevator controller 401; A signal transmission pulse transformer T51 connected to the network transmission path 11L and outputting a pulse signal; The resistors R51 and R52 used for biasing the pulse transformer T51 and a reset circuit 504 and a buffer 505 for resetting the one-chip processor 501 at power-on are configured.

FIG. 6 is a block diagram showing an embodiment of a car controller 407 or a platform controller 403-406 forming a network serial transmission system with a network transmission controller 402, similar to FIG. The difference is that it has an input / output circuit 603 required in addition to the boarding point and the car in addition to the dual port RAM.

7 shows the abnormality of the network transmission path 11L and the abnormality of the one-chip processor 501 and 601 in the network transmission control device 402, the car control device 407, and the platform control devices 403-406. As a circuit diagram showing an embodiment of the transmission control unit 502, 602 which determines the presence or absence and controls the connection to the network transmission path 11L, as shown therein, the existence of an abnormality of the network transmission path 11L is checked and the result is determined accordingly. A retrievable multivibrator 701 for outputting a signal; A counter 704 for counting the number of abnormal detections output from the retriggerable multivibrator 701; A counter 708 for counting the number of times of abnormal occurrence in the one-chip processor 501; NAND gates 705, 709, and gates 710 and transistors for turning off the transmission-blocking relay RY71 when the count value of the counter 704 or counter 708 exceeds a predetermined value. Q71), and the operation of the present invention configured as described above will be described in detail as follows.

When the elevator control device 401 performs serial communication with the platform control device 403-406 or the car control device 407 via the network transmission control device 402 and detects a failure of a predetermined number of times in one control device. The control device is separated from the network transmission path 11L. Since their configuration is similar to each other and the communication method with them is also similar, serial operation with the car control device 407 is taken as an example in the following description.

First, when power is supplied to each control device, the counters 704 and 708 in the one-chip processor 601 and the transmission control unit 602 are initialized by the reset circuit 604.

In order to determine the abnormality of the network transmission path 11L (11L = 11A, 11B), the primary coil of the signal transmission pulse transformer T61 is connected to the transmission paths 11A, 11B, and one side of the secondary coil. The tap A was connected to the trigger terminal T + of the retriable multivibrator 701 as shown in FIG.

At this time, the network transmission control device 402 on the elevator control device 401 side periodically on the network transmission path 11L to perform serial communication with the car control device 407 and the platform control devices 403-406. Output the signal.

Accordingly, the multi-vibrator 701 can detect a signal that is regularly transmitted on the network transmission path 11L through the path. If the signal cannot be detected, the network transmission path is for some reason. It is determined that an abnormality has occurred at 11L.

For this purpose, the power supply terminal VCC is directly connected to the input terminals -T and CLR of the retriggerable multivibrator 701 and connected to the input terminal RC through the resistor R71. Again, the condenser C71 was connected to the input terminal CX.

Accordingly, when the signal is normally supplied through one side tap A of the secondary coil of the network transmission paths 11A and 11B and the signal transmission pulse transformer T61, the resistor R71 and the capacitor C71 are used. The retriggerable multivibrator 701 is repeatedly triggered by the time constant determined to be " low " at its output terminal Q continuously.

However, when a signal is not normally supplied from the network transmission paths 11A and 11B to the retrievable multivibrator 701, a ″ high ″ pulse is output at the output terminal Q of the retrievable multivibrator 701. Is output, which is supplied to the input terminal A of the counter 704 to increase its count value by one.

When detecting more than eight times through the path, ″ high ″ is output to all of the output terminals Qa, Qb, and Qc of the counter 704, so that ″ low ″ is output to the NAND gate 705. As a result, " low " is output to the output terminal of the AND gate 710, so that the transistor Q71 is turned off. Therefore, the transmission path blocking relay RY71 is turned off to disconnect the car control device 407 from the network transmission path 11L.

At this time, the ″ low ″ signal output from the NAND gate 705 is inverted to a ″ high ″ signal through the inverter 702 and supplied to the control terminal of the tri-state buffer 703, whereby the retrievable multi-vibration is performed. Since the output signal of the letter 701 is blocked by the three-state buffer 703, the count operation by the subsequent abnormal detection is stopped.

The following describes the processing by each fault of each control device.

In recent years, watchdog timers capable of effectively processing a central processing unit have been commercially available, and many of them have embedded circuits inside one-chip processors.

In addition, the one-chip processor performs a reset process on its own and outputs a reset signal to reset the peripheral hardware.

For example, in FIG. 6, the central processing unit CPU61 processes the watchdog timer 601C inside the one-chip processor 601 to perform a monitoring function for the program processing of the central processing unit CPU61. The watchdog timer 601C is periodically reset by the program.

Due to various reasons, such processing error results in failure detection of the watchdog timer 601C, whereby the one-chip processor 601 is reset. When the one-chip processor 601 is reset, reset signals C.REST and P.REST are output through the parallel communication input / output port PIO61 and the input / output circuit 603.

The reset signals C.REST and P.REST are supplied to the counter 708 through the tri-state buffer 707 and counted as described above, and are repeated several times (for example, 8). Is detected, the " low " signal is output from the NAND gate 709, whereby the transmission line blocking relay RY71 is turned off, and the control device is disconnected from the network transmission line 11L.

As described in detail above, the present invention is an elevator control device for controlling the operation of the elevator, the car control device for controlling the input and output signals of the elevator car and the platform control device for controlling the input and output of the platform in a plurality of platforms, respectively, network transmission control In an elevator signal transmission system that includes a device and is connected to a common transmission path and performs serial transmission of signals between the devices, the car input / output device and the platform control device check the abnormality of the transmission path and, when an abnormality is detected, transmits itself from the transmission path. By separating, each controller has an effect of preventing various side effects due to abnormalities in the transmission path. That is, when data cannot be received from the elevator controller through the transmission path, the failure factor of the transmission path is essentially eliminated by separating itself from the transmission path, thereby improving the reliability of the network transmission control system of the elevator signal transmission system. As a result, the reliability of the elevator system is improved. In addition, when each control device having a magnetic failure detection circuit detects a failure of several times or more, the connection to the transmission path is completely disconnected, thereby causing a permanent failure in each control device having the network transmission control device. There is an effect that can prevent the occurrence of a disorder.

Claims (4)

The elevator controller 401 for controlling the operation of the elevator, the car controller 407 for controlling the input / output signals of the elevator car, and the platform controllers 403-406 for controlling the input / output of the platforms in a plurality of platforms are respectively networked. In an elevator signal transmission device having a transmission control device and connected to a common transmission path to perform serial transmission of signals between the devices, the car control device 407 and the platform control device 403 to 406 are connected to each other. Abnormality detecting means for detecting an abnormality and outputting an abnormality detection signal according thereto; A one-chip processor that monitors an internal program processing state and outputs an error detection signal accordingly when an abnormality is detected; The elevator signal comprising a transmission path separating means each counting the number of abnormal detections supplied from the abnormality detecting means or the one-chip processor and separating the self from the transmission path when the count value exceeds a predetermined value. Transmission device. The car controller 407 of claim 1, wherein the elevator controller 401 is disconnected from the transmission path due to an abnormality of the transmission path and its own failure in order to maintain the optimum signal required on the transmission path. And the platform control apparatus (403-406) so as not to transmit the control signal. 2. The car control apparatus (407) and the platform control apparatus (403-406) according to claim 1, in order to maintain an optimum signal on the transmission path, the connection to the transmission path until the cause of the abnormality and failure is resolved. Elevator signal transmission, characterized in that configured not to allow. 2. The transmission path separating means according to claim 1, further comprising: a retriggerable multivibrator (701) for outputting an abnormal detection signal when a signal is not periodically input through the transmission path (11L); A counter 704 for counting the abnormality detection signal output from the retriggerable multivibrator 701; A counter 708 for counting the abnormality detection signal output from the one chip processor 501; Respective NAND gates 705 and 709 which output a " low " signal when the counter value of the counter 704 or counter 708 exceeds a certain value; An AND gate 710 for and combining the output signals of the NAND gates 705 and 709; A transistor (Q71) for controlling driving of a transmission-blocking relay (RY71) in accordance with the output signal of the AND gate (710); When the count value of the abnormality detection signal exceeds a predetermined value, an elevator signal transmission comprising a transmission path blocking relay (RY71) for separating the car control device or the platform control device from the transmission path 11L. Device.