JP3388140B2 - Monitoring device for sequence control circuit - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a monitoring device for a sequence control circuit that controls the operation of, for example, an elevator, and more particularly to monitoring a sequence control circuit for monitoring the operation of contacts and relays that form the sequence control circuit. Regarding the device.

[0002]

2. Description of the Related Art Conventionally, the operation of an elevator is sequence-controlled, and a sequence control circuit having a plurality of contacts and relays that sequentially operate from the upper side to the lower side as the sequence progresses is used.

If an abnormality occurs in the operation of the contacts or relays that make up this sequence control circuit, the progress of the sequence is interrupted and the operation of the elevator is significantly hindered.
For this reason, it is usual to regularly maintain and inspect each contact and relay of the sequence control circuit to maintain its operating condition in a good condition.

FIG. 8 is a diagram for explaining a work form of a conventional regular inspection of an elevator. As shown in the figure, at the time of regular inspection, the inspection worker installs the electromagnetic relay 2 installed in the control device 19 in the machine room 18.
Conduct an operation test such as 0 to check the operating state of each contact and relay of the sequence control circuit that controls the operation of the elevator.

[0005]

By the way, if the abnormality in the operation of the contacts of the sequence control circuit is caused by aging deterioration or the adhesion of dust, or the abnormality in the operation of the relay leads to the disconnection state. If it is caused by the deterioration of the exciting coil to the extent that it is not present, the operation may become unstable due to the contact or relay not turning on and off, but eventually it will often recover to the normal state. In such a case, there is a problem that the inspection worker cannot know the abnormality of the operation of the contact or the relay, except for the abnormality that occurred during the periodic inspection, according to the conventional regular inspection.

When the operation of the contact or the relay is repeatedly performed while the latent abnormality of the operation is held, the contact or the relay (excitation coil) is deteriorated or the amount of dust attached increases. , Its operation will not recover to normal. As a result, a failure occurs in the sequence control circuit, causing a very serious situation in which the operation of the elevator or the like is stopped.

In order to eliminate such latent contact and relay operation abnormalities at the time of regular inspection, it is necessary to replace the electromagnetic relays over a wide range including the portion where the operation abnormality is suspected. In this case, since many normal electromagnetic relays are also targets for replacement, there is a problem that the work efficiency is extremely low, a lot of work time is required, and the cost required for maintenance and inspection is increased.

The present invention has been made in view of the above problems, and detects abnormalities in the operation of contacts and relays of a sequence control circuit at an early stage to prevent a failure from occurring and to perform maintenance and inspection. An object of the present invention is to provide a monitoring device for a sequence control circuit that can significantly improve work efficiency and cost.

[0009]

[Means for Solving the Problems] The present invention has the following configuration in order to solve the problems described above. That is, the present invention relates to a monitoring device of a sequence control circuit, which has a plurality of contacts and relays that operate according to the progress of a sequence, and monitors the operating states of the contacts and relays of the sequence control circuit that controls the sequence of the controlled object. Via the input means for inputting the status state of each contact constituting the sequence control circuit and the trigger state of each relay, the display means for displaying the status state of each contact and the trigger state of each relay, and the input means The status status of each contact of the sequence control circuit and the trigger status of each relay are taken in, and the status status of each contact and the trigger status of each relay are set to the status status of the contact located at the higher order of sequence control and the trigger status of the relay. and control means for display control in said display means in correspondence Provided, the control means, when the relay is energized,
Status status or relay of the contact located above it
The display of the trigger state of is controlled to be erased .

[0010]

Further, the storage means is further provided, and the control means stores in the storage means the status states of the contacts and the trigger states of the relays fetched via the input means, and the storage contents of the storage means. It is characterized in that the display means controls the display based on the above.

Furthermore, the control means reads out the status status of each contact or the trigger status of each relay from the storage means and determines whether the status status of each contact or the trigger status of each relay is abnormal. It is characterized in that the status of each contact or the trigger status of each relay and the status of a contact located above it or the trigger status of the relay are determined, and display control of the display means is performed based on the result of the determination. To do.

Further, the display means comprises a light emitting means having a plurality of light emitting colors, and displays the status of each contact and the trigger status of each relay in correspondence with the light emitting status of the light emitting means. The control means controls the display of the display means by selecting the emission color of the light emitting means in accordance with the status state of the plurality of contacts or the trigger state of the relay determined according to the progress of the sequence of the sequence control circuit. It is characterized by

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION A monitoring device for a sequence control circuit according to an embodiment of the present invention (hereinafter, simply referred to as "main monitoring device") monitors the operating states of contacts and relays forming the sequence control circuit. This is for displaying the status of each contact and the trigger of each relay.

The present monitoring device will be described in detail below with reference to FIGS. 1 to 7. Here, FIG. 1 is a block diagram showing the configuration of the present monitoring apparatus, and FIG. 2 is an external view of the present monitoring apparatus viewed from the operation panel side. Further, FIG. 3 is a diagram showing an example of a sequence control circuit to be monitored by the monitoring device, and FIGS. 4 and 5 are diagrams for explaining a display state of a display unit of the monitoring device. Further, FIG. 6 is a waveform diagram for explaining the operation of the present monitoring apparatus.
FIG. 6 is a diagram for explaining an example of mounting the present monitoring device with an outer panel removed. It should be noted that the same reference numerals are given to common elements in each drawing.

As shown in FIG. 1, the present monitoring apparatus 1 has an interface as an input means for inputting status signals of respective contacts and trigger signals of respective relays constituting a sequence control circuit of a monitoring target shown in FIG. 3 which will be described later. (I /
F) 6 and a display section 8 as display means for displaying the status of each contact and the trigger of each relay.
And the status signal of each contact of the sequence control circuit and the trigger signal of each relay via the interface 6, and the status status of each contact and the trigger status of each relay are the status status of the contact located at the higher order of sequence control. And a control section (CPU) 2 as a control means for controlling the display on the display section 8 in correspondence with the trigger state of the relay, and further, the control section 2
The read-only memory (ROM) 3 for storing the control program executed by the control unit 2, the random access memory (RAM) 4 for storing the processing result regarding the control executed by the control unit 2, and the control unit 2 of various types. An operation unit 5 for giving an operation command, a condition setting unit 7 for setting an erasure control condition described later, a printer interface 9 for outputting the processing result of the control unit 2 to an external printer, and a book The monitoring device 1 includes a power supply unit 10 for supplying operating power to each unit, and a transmission input unit 11 and a transmission output unit 12 as connectors for connecting the interfaces 6 and 9 to the outside. It

The above-mentioned display unit 8 includes a trigger display unit 8a for displaying the trigger state of each relay constituting the sequence control circuit to be monitored, and a status display unit for displaying the status state of each contact. 8b, a time display section that displays the time when an abnormality occurs in the operation of the contacts and the relay, and a trigger count display section 8d that displays the number of times the relay is triggered. The condition setting section 7 includes A switch S1 for setting a trigger signal and a trigger form as erase control conditions, which will be described later.
S2 is provided.

Further, as shown in the external view of FIG. 2, the monitoring device 1 is housed in a box-shaped housing, and an operation panel (no reference numeral) arranged on the front side thereof The power switch PS is arranged together with the operation section 5 and the display section 8 described above, and the transmission input section 11 and the transmission output section 12 are arranged on the side surface thereof. The transmission input unit 11 receives the status signal of each contact and the trigger signal of the relay from the sequence control circuit to be monitored, and the transmission output unit 12 outputs the printer control signal for controlling the external printer. It

Furthermore, as shown in the figure, the trigger display section 8a is provided with a light emitting diode T ₁ , which is assigned to display the operating state (trigger state) of the relay constituting the sequence control circuit to be monitored. 7 such as T ₂
18 diodes are arranged, and in the status display section 8b, 18 light-emitting diodes S ₁₁ , S _12, etc., which are allotted to display the operation state (status state) of the contacts which also constitute the sequence control circuit, are emitted. The diodes are arranged in a matrix of 3 rows and 6 columns.
These light emitting diodes display the operating state of each contact or relay in correspondence with its light emitting state (lighting / lighting off).

Next, the sequence control circuit shown in FIG. 3 will be briefly described as an example of the monitoring target of the monitoring apparatus 1. The sequence control circuit shown in the figure controls a part of the operation of, for example, an elevator, and is composed of two circuits, an X system circuit and a Y system circuit.

Each of the X system circuit and the Y system circuit is connected between a positive power source (+) and a negative power source (-), and one X system circuit has a contact 13, a switch contact 14, and a control. The relay (X) 15 is connected in series, and the other Y system circuit is formed by connecting a contact 16 and a control relay (Y) 17 in series.

Here, the contacts 13 that form the X system circuit are
The switch contact 14 is a normally closed contact that is normally closed during operation, and the control relay 15 is a normally open relay for starting operation. On the other hand, the contact 16 that constitutes the Y-system circuit is a normally open contact that is closed by the bias of the control relay 15 described above, and the control relay 17 is a normally open relay. Control relay 15
It is assumed that the control relay 17 and the control relay 17 are excited when the trigger signal is at a high level.

The operation of the sequence control circuit to be monitored having such a configuration will be described. When the contact 13 is closed according to the progress of the sequence, the potential of the positive power source (+) appears as the status signal C via the contact 13, and then appears as the status signal D via the switch contact 14. The potential of the positive power source (+) that appears through the contact 13 and the switch contact 14 is given to the exciting coil of the control relay 15 and appears as the trigger signal A, and the control relay 15 is excited and closed.

Next, in the sequence control order, the operation of the Y-system circuit located lower than the above-mentioned X-system circuit is started. That is, when the contact 16 is biased by the operation of the control relay 15 to be closed, the potential of the positive power source (+) appears as the status signal E via the contact 16. The potential of the positive power source (+) that appears through the contact 16 is the control relay 1
7 is applied to the excitation coil 7 and appears as a trigger signal B, and this control relay 17 is excited and closed. With the above, the operations of the X system circuit and the Y system circuit are completed.

In a series of operations of this sequence control circuit, the status signals C, D and E are respectively applied to the contact 1
The operating states of 3, 14, and 16, that is, the status states are reflected, and the trigger signals A and B reflect the operating states of the control relay 15 and the control relay 17, that is, the trigger states, respectively.

For example, when the insulating dust adheres to the contact 13 and the potential of the positive power source (+) does not appear as the status signal C, the abnormality of the operating state of the contact 13 is known from the signal level of the status signal C. be able to. The present invention is
Focusing on this point, the signal state of each status signal and trigger signal in the sequence control circuit is displayed as the operating state of each contact and relay.

In the following, regarding the operation of the present monitoring apparatus 1 shown in FIGS. 1 and 2, with the above sequence control circuit as a monitoring target, the control unit 2 controls the display of the display unit 8 with respect to the condition setting unit 7. The case where the erasure control condition described later is not set and the case where the erasure control condition is set will be described separately. The erase control condition will be described in detail later.

First, the case where the erasure control condition is not set in the condition setting unit 7 will be described. When a monitoring operation start command is given from the operation unit 5 to the control unit 2, the control unit 2 starts a series of monitoring operations according to a program stored in the read-only memory 3, as described below.

That is, the control unit 2 takes in the status signals C, D and E of each contact and the trigger signals A and B of each relay from the sequence control circuit to be monitored shown in FIG. The display status of the relay status and the trigger status of the relay are controlled to be displayed on the display unit 8 in correspondence with the status status of the contact positioned higher in the sequence control and the trigger status of the relay.

The display control performed by the control unit 2 on the display unit 8 will be specifically described below with reference to FIG. Here, FIG. 4 shows a display state of the display unit 8 shown in FIGS. 1 and 2, and shows an example of a display in which the operating state of each contact and the relay is made to correspond to the light emitting state of each light emitting diode. It is a thing.

As an initial state of the sequence control circuit to be monitored shown in FIG. 3, it is assumed that the contacts 13 and 16 are open (the switch contact 14 is always fixed in a closed state). In this initial state, the potential of the negative power source (-) is the trigger signals A, B and the status signals C, D,
Appears as E.

When the sequence control is started from this initial state and the contact 13 is closed, the potential of the positive power source (+) appears as the status signal C via the contact 13. The control unit 2 takes in the signal state of the status signal C,
As shown in FIG. 4A, the light emitting diode S ₁₁ of the status display portion 8b is turned on to display the status of the contact 13.

Next, the potential of the positive power source (+) is supplied with the status signal D via the switch contact 14 fixed in the closed state.
Appears as. The control unit 2 takes in the signal state of the status signal D, further lights up the light emitting diode S ₁₂ , and displays the status state of the switch contact 14, as shown in FIG. 4B.

Next, the potential of the positive power source (+) that appears through the contact 13 and the switch contact 14 is given to the exciting coil of the control relay 15 and appears as the trigger signal A.
The control unit 2 takes in the signal state of the trigger signal A, and further turns on the light emitting diode T ₁ of the trigger display unit 8a to display the trigger state of the control relay 15, as shown in FIG. 4C.

Thus, when the contact 13, the switch contact 14, and the control relay 15 sequentially operate in accordance with the progress of the sequence, and the potential of the positive power source (+) appears as the status signals C and D and the trigger signal A in sequence. , Control unit 2
Causes the light emitting diodes S ₁₁ , S ₁₂ , and T ₁ of the display unit 8 to sequentially light up. The inspector, from the display state so far,
The potential of the positive power supply (+) is the contact 13 and the switch contact 14.
It is known that the signal is applied to the exciting coil of the control relay 15 through the, and that there is no abnormality in the operation of each contact of the X system circuit and the relay.

Next, the potential of the positive power source (+) is changed to the control relay 1
When the control relay 15 is actuated by being applied to the exciting coil of No. 5, the contact 16 of the Y system circuit is closed by being energized, and the potential of the positive power source (+) is transmitted via the contact 16 to the status signal E. Appears as. The control unit 2 takes in the signal state of the status signal E, and further turns on the light emitting diode S ₂₁ of the status display unit 8b to display the status state of the contact 16, as shown in FIG. 4 (d).

Next, the potential of the positive power source (+) that appears through the contact 16 is given to the exciting coil of the control relay 17 and appears as the trigger signal B. The control unit 2 takes in this signal state, and further turns on the light emitting diode T ₂ of the trigger display unit 8a to display the trigger state of the control relay 17, as shown in FIG. 4 (e). The inspector knows from the display state so far that the potential of the positive power source (+) is applied to the exciting coil of the control relay through the contact 16, and the contacts and relays of the X system circuit and the Y system circuit are relayed. Know that there is no abnormality in the operation of.

As described above, when the erasure control condition is not set in the condition setting unit 7, each of the display units 8 assigned to display the operating state of each contact and relay as the sequence control progresses. The light emitting diodes are sequentially turned on, and the display section 8 is display-controlled by the control section 2. The trigger count display unit 8d of the display unit 8 displays the trigger count of the trigger signal A, for example, so that the number of operations of the contacts and relays in the X-system circuit, that is, the number of times the sequence is executed can be known. .

Next, the operation when the erase control condition is set in the condition setting section 7 will be described with reference to FIG. As will be described in detail below, when the erasure control condition is set in the condition setting unit 7, the control unit 2 controls the erasure of the display of the status status on the upper side when the erasure control condition is satisfied, and The display state of the display unit 8b is organized.

First, the switches S1 and S2 of the condition setting section 7 are operated to set the above-mentioned erase control condition. This erasure control condition is a condition for performing erasure control for erasing the display of the status state.As this erasure control condition, the trigger signal of the relay and the signal state when the trigger signal triggers the relay (hereinafter , "Trigger form") are set.

Specifically, the above-mentioned trigger signals A and B are set as the trigger signals for the erase control condition, and the trigger state is a signal state in which the trigger signal transits from a low level to a high level (hereinafter, "up"). “Slope trigger state”) or a signal state transiting from a high level to a low level is selected and set.

In the present embodiment, both the trigger signals A and B are set as the trigger signals of this erasing control condition, and the up-slope trigger state is set as these trigger forms. In this case, the erase control condition is set as "the trigger signal A is in the up-slope trigger state" or "the trigger signal B is in the up-slope trigger state". That is, the trigger signal A or B received via the interface 6 is
When the up-slope trigger state is entered, the erase control condition is satisfied.

As described above, since the control relay 15 and the control relay 17 shown in FIG. 3 are excited in the high level state of the trigger signal, the above-mentioned erasing control condition is satisfied. Means that there is no abnormality in the trigger state of the relay triggered by the trigger signal set as the erase control condition. The control unit 2
As described above, when the erasure control condition set in the condition setting unit 7 is satisfied, the erasure control of the status display on the upper side is performed, which will be specifically described later. The trigger signal and the trigger form of the erase control condition may be appropriately selected according to the configuration of the monitoring target, and the status signal may be set instead of the trigger signal.

In this way, when the operating unit 5 gives a start command of the monitoring operation to the control unit 2 after setting the erasure control condition in the condition setting unit 7, the control unit 2 will operate as described below. , Starts a series of monitoring operations according to the program stored in the read-only memory 3.

That is, when the contact 13 of the sequence control circuit is closed as the sequence control progresses, the potential of the positive power source (+) appears as the status signals C and D in sequence. The control unit 2 takes in these signal states,
As shown in FIGS. 5A and 5B, the light emitting diodes S ₁₁ and S ₁₂ of the status display portion 8b are sequentially turned on to display the respective status states of the contact 13 and the switch contact 14.

Next, the potential of the positive power source (+) that appears through the contact 13 and the switch contact 14 is given to the exciting coil of the control relay 15 and appears as the trigger signal A.
At this time, the trigger signal A transits from the potential of the negative power supply (−) (low level) to the potential of the positive power supply (+) (high level), becomes the up-slope trigger state, and is set in the condition setting unit 7. The erase control condition is satisfied. The control unit 2 takes in the signal state of the trigger signal A, and
As shown in, the light emitting diode T of the trigger display portion 8a
₁ is lit and the trigger state of the control relay 15 is displayed.

By the way, in the sequence control, since the higher order operation is reflected in the lower order, it is inevitable that the upper order operation is not abnormal unless the lower order operation is abnormal. Therefore, when a display indicating that there is no abnormality in the lower operation is displayed, it is not necessary to display the upper operation state.

Therefore, in the X system circuit, the trigger signal A of the control relay 15 located at the lowest position of sequence control is given.
However, the control relay 1
If there is no abnormality in the trigger state of No. 5, that is, if the above-mentioned erasure control condition is satisfied, the control unit 2 operates as shown in FIG.
As shown in, the light emitting diodes S ₁₁ and S ₁₂ are turned off, and the display of the status state of the contact 13 and the switch contact 14 located above the control relay 15 in the sequence control order is erased.

At this time, the display state of the display section 8 is such that only the light emitting diode T ₁ of the trigger display section 8a is turned on, and the inspector can check the contact state of the X system circuit and the relay from this display state. Know that there is no abnormality in operation.

Next, as described above, when the control relay 15 is excited and operates, it is energized to close the contact 16 and the potential of the positive power source (+) serves as the status signal E and the trigger signal B. Appear one after another. The control unit 2 takes in the signal state of the status signal E, and as shown in FIG. 5D, controls the light emitting diode S ₁₁ that has displayed the status state of the contact 13 until the above-described erase control is performed. It is turned on again to display the status of the contact 16.

Next, the control section 2 takes in the signal state of the trigger signal B, lights the light emitting diode T ₂ and displays the trigger state of the control relay 17, as shown in FIG. 5 (e). At this time, since the trigger signal B is in the up-slope trigger state, the erase control condition set in the condition setting unit 7 is satisfied. Therefore, the control unit 2 turns off the light-emitting diode S ₁₁ and controls the display of the status state of the contact 16 positioned above the control relay 17 in the sequence control order to be erased.

At this time, the display state of the display unit 8 is such that only the light emitting diodes T ₁ and T ₂ of the trigger display unit 8a are turned on, and the inspector can check the X system circuit and the Y state from this display state. Know that there is no abnormality in the operation of each contact and relay of the system circuit.

In the above-mentioned erasure control, only the display of the status of the upper side is erased, but the display of the trigger state of the higher side may be erased together. In this case, the display state shown in FIG. 5 (e) is such that only the light emitting diode T ₂ is turned on, and the operating states of both the X system circuit and the Y system circuit are summarized in the light emitting diode T ₂ lighting state. Becomes That is, in this case, if the light emitting diode T ₂ is on, there is no abnormality in the operating state of the X system circuit and the Y system circuit.

The operation in the case where there is no abnormality in the operation of each contact and relay has been described above separately for the case where the above-mentioned erasure control condition is not set and the case where it is set. Assuming that there is a cause of an abnormality in the contact operation of the contact 16 shown, the inspector determines that the monitoring device 1
The process of identifying the location of the cause of abnormality from the display state of will be specifically described with reference to FIG.

Now, when the operation of the contact 16 becomes abnormal due to the cause of the abnormality existing in the contact 16, the potential of the positive power source (+) does not appear as the status signal E, and the progress of the sequence is interrupted. In this case, the display on the display unit 8 is as shown in FIG.
When it becomes the one shown in (c), it stops and the control relay 1
Light emitting diode T ₁ for displaying the trigger state of 5
Only the light will be lit. From this display state, the inspector has no abnormality in the operation of the contact 13, the switch contact 14, and the control relay 15, and the contact 16 and the control relay 1
Know that an abnormality has occurred in the operation of 7.

Here, the contact 16 reflects the respective operations of the contact 13, the switch contact 14, and the control relay 15 which are positioned higher in the sequence control order. Since no abnormality is recognized in the operation of the contact 16, the inspector knows that the cause of the operation of the contact 16 is in the contact 16 itself.

On the other hand, since the operation of the control relay 17 in which the abnormality is also recognized reflects all the operations on the upper side thereof, the abnormality of the operation of the control relay 17 is detected by the contact 16 positioned on the upper side. It may be caused by the abnormal operation being reflected, or may be caused by the cause of the abnormality of the control relay 17.

Therefore, the inspection worker finds from this display state that the cause of the operation abnormality of the control relay 17 is the control relay 17
It is not concluded that it exists in itself, and the control relay 17
Does not deny that he may have a cause of abnormal operation. That is, in this case, the inspector identifies at least the contact 16 as having an abnormal cause of operation,
The contact 16 is replaced. At this time, the control relay 17 that may have the cause of the operation abnormality itself
May be replaced at the same time.

In this way, the inspection worker is
From the display state of, the current progress status of the sequence control is grasped, the contact or relay in which the operation is abnormal is identified, the contact or relay having the cause of the abnormality is specified, and the maintenance and inspection work is performed.

In the above description of the operation of the present monitoring apparatus 1, the control unit 2 displays the status state of each contact and the trigger state of each relay on the display unit 8 in sequence as the sequence progresses. The status of each contact and the trigger status of the relay may be temporarily stored in the memory 4, and the contents stored in the memory 4 may be read and displayed on the display unit 8.

As described above, if the operating states of the contacts and relays are stored in the memory 4, it is not necessary for the inspection operator to keep an eye on the display state of the display unit 8 at all times. By reproducing the operating state of each contact or relay from the contents of 4, the operating state up to that point can be known. In this case, the control unit 2 displays at what time the operation state displayed on the display unit 8 is at the time display unit 8c shown in FIGS.

By the way, when the operating state of each contact or relay is displayed from the stored contents of the memory 4, it may be displayed by determining whether or not the operating state of each contact or relay is abnormal. In the following, assuming that there is a cause of operation abnormality in the switch contact 14 shown in FIG. 3, and an example in which an abnormality in the operation state of each contact and relay of the X system circuit shown in the same figure is determined and displayed, The operation of the control unit 2 will be specifically described with reference to FIG. Here, FIG. 6 is a waveform diagram of the status signals C and D and the trigger signal A stored in the memory 4 as the operating states of the contacts and the relay, and the waveform indicated by the solid line is abnormal in the operation of the contacts and the relay. This is the original waveform in the case where there is no, and the part indicated by the broken line is due to an abnormal operation.

In the X system circuit shown in FIG. 3, assuming that there is no abnormality in the operation of each contact and relay, the status signal D
As shown by the solid line in FIG. 6A, the trigger signal A and the trigger signal A transit almost simultaneously with the status signal C positioned higher in the sequence control order.

Now, as indicated by the broken line in the figure, the status signal D
However, if you stand up after the time when you should stand up,
Under this influence, the rising edge of the trigger signal A is also delayed. Such a signal state occurs, for example, when the conductive state of the switch contact 14 becomes unstable due to adhesion of insulating dust or the like.

When the control section 2 fetches the signal waveforms shown in FIG. 6A from the memory 4, the operation state of the switch contact 14 is shown in FIG. 6 from the relationship between the status signals C and D.
It is determined that the section P1 shown in (a) is abnormal.
That is, although the status signal D should originally rise almost at the same time as the status signal C, in the section P1, the state up to that point continues, and from this fact, the control unit 2 controls the switch contact 14 Determine abnormal operation.

Next, the control unit 2 does not determine from the relationship between the trigger signal A and the status signals C and D that the operation state of the control relay 15 is abnormal. because,
Although the trigger signal A rises after being delayed from the time when it should originally rise, this delay is inevitable from the state of the status signal D and does not serve as the basis for determining that the operation of the control relay 15 is abnormal. .

Next, the operation of the control unit 2 will be described by taking the case where the waveform of each signal is as shown in FIG. 6B as an example. In this case, the status signal D is delayed due to the cause of abnormality of the switch contact 14, but the trigger signal A rises at the same time as the status signal C. Such a signal state occurs, for example, when the exciting coil of the control relay 15 is electrically connected to the contact 13 due to adhesion of conductive dust or the like.

In this case, in the same manner as described above, the control section 2 determines that the section P2 has the following relationship from the relationship between the status signals C and D.
It is determined that the operation of the switch contact 14 is abnormal. Next, the control unit 2 determines that the operation of the control relay 15 is abnormal based on the relationship between the status signal D and the trigger signal A.
Because the trigger signal A rises at the time when it should originally rise in relation to the status signal C, and it cannot be said that the operation is abnormal in this sense, but in relation to the status signal D, This is because the operation of the upper switch contact 14 is not reflected in the order of sequence control, and the operating state of the control relay 15 is rather abnormal.

As described above, the control unit 2 determines whether or not each contact or relay is in an abnormal operating state, and determines the status of the contact or the trigger state of the relay, and the position higher in the sequence control order. The status of the contact to be contacted or the trigger status of the relay is referenced to make a determination, and the result of this determination is displayed on the display unit 8. As a result of the determination as described above, the abnormality caused by the operation abnormality on the upper side of the sequence control is eliminated. Therefore, the inspector specifies the contact or the relay whose operation abnormality is determined by the control unit 2 as having the cause of the operation abnormality.

In the present embodiment, the control section 2 determines the operation abnormality when reading out and displaying the operation state of each contact or relay from the memory 4, but as the sequence control proceeds, Whether or not the operation of the contact or the relay is abnormal may be sequentially determined and displayed on the display unit 8, or the determination result may be temporarily stored in the memory 4 and displayed.

Further, in the present embodiment, the trigger display portion 8a and the status display portion 8b of the display portion 8 display the operating state of each contact or relay in association with the light emitting state (lighting / lighting off) of the light emitting diode. However, the light emitting means having a plurality of light emitting colors may be provided, and the light emitting color of the light emitting means may be selected and display-controlled according to the status state of the plurality of contacts or the trigger state of the relay. Good.

For example, in the operation of the X system circuit shown in FIG. 3, when the contact 13 is closed and the potential of the positive power source (+) appears as the status signal C, the control unit 2 causes the emission color of the light emitting means. Assuming that yellow is selected to control the display of the display unit 8 and then, when the potential of the positive power source (+) appears as the status signal D, red is selected to control the display. A plurality of operating states are expressed by the light emitting means.

Further, in this embodiment, the main monitoring device 1 is housed in the box-shaped housing having the outer panel.
The various parts that make up the car are protected and made suitable for carrying. On the other hand, as shown in FIG. 7, the outer panel is removed, and a panel unit 1a on which the display unit 8 and the like are arranged and a printed circuit board 1b on which various components such as the control unit 2 are mounted
It may be configured as a combination of and.

In the case of such a configuration, various parts constituting the monitoring device 1 are exposed to the outside, but as shown in the figure, the bolts are installed inside the control device (no reference numeral) to be monitored. By mounting with B or the like, it is possible to individually deal with each monitoring target, and it becomes a form suitable for long-term monitoring.

[0075]

As is apparent from the above description, according to the present invention, the following effects can be obtained. That is, the status state of each contact and the trigger status of each relay that make up the sequence control circuit to be monitored are configured to be displayed in correspondence with the status status of the contact located higher in the sequence control and the trigger status of the relay. Therefore, it is possible to visually grasp the operating state of each contact or relay of the sequence control circuit to be monitored, identify an operation abnormality, and specify the contact or relay having the cause of the abnormality.

Further, when the relay of the sequence control circuit to be monitored is excited, the sequence of sequence control controls the erasure of the operating states of the contacts and relays located above it, and the unnecessary display is sorted out. The progress of the sequence can be easily identified.

Furthermore, by storing the operating state of each contact or relay in the storage means, an abnormal operation can be grasped ex post facto, and it is necessary for the inspector to constantly watch the display state. Disappear.

Furthermore, by inspecting and displaying whether or not the operating state of each contact or relay is abnormal, the inspector can quickly grasp the contact or relay having the cause of abnormality from the displayed contents. Therefore, the inspection work can be performed more efficiently.

Furthermore, the number of parts constituting the display means can be reduced by selecting the light emission color according to the operation state of the plurality of contacts or relays and causing the light emitting means to emit light. The device can be made compact.

Therefore, according to the present invention, it is possible to detect abnormalities in the operation of the contacts and relays held by the sequence control circuit to be monitored at an early stage, prevent the sequence control circuit from failing, and perform inspection. The work can be performed extremely efficiently, and the cost required for maintenance and inspection can be minimized.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a monitoring device according to an embodiment of the present invention.

FIG. 2 is an external view of a monitoring device according to an embodiment of the present invention.

FIG. 3 is a diagram showing an example of a sequence control circuit to be monitored by the monitoring device according to the embodiment of the present invention.

FIG. 4 is a diagram for explaining a display control operation of a display unit included in the monitoring device according to the embodiment of the present invention.

FIG. 5 is a diagram for explaining an erase control operation of the display unit included in the monitoring device according to the embodiment of the present invention.

FIG. 6 is a diagram for explaining the operation of the control unit included in the monitoring device according to the embodiment of the present invention.

FIG. 7 is a diagram for explaining an implementation example of the monitoring device according to the embodiment of the present invention.

FIG. 8 is a diagram for explaining a work mode of a regular inspection of an elevator.

[Explanation of symbols]

1 monitoring device, 2 control unit, 3 read-only memory,
4 random access memory, 5 operation unit, 6 interface, 7 condition setting unit, 8 display unit, 8a trigger display unit, 8b status display unit, 8c time display unit, 8d trigger count display unit, 9 printer interface, 10 power supply unit , 11 Transmission input section, 12
Transmission output, PS power switch.

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) G01R 31/00 G05B 23/02 301

Claims (4)

(57) [Claims] 1. A monitoring device for a sequence control circuit, which has a plurality of contacts and relays that operate according to the progress of a sequence, and monitors the operating states of the contacts and relays of the sequence control circuit that controls the sequence of a controlled object. Input means for inputting the status of each contact constituting the control circuit and the trigger status of each relay, display means for displaying the status of each contact and trigger status of each relay, and via the input means The status status of each contact of the sequence control circuit and the trigger status of each relay are taken in, and the status status of each contact and the trigger status of each relay correspond to the status status of the contact located at the higher order of sequence control and the trigger status of the relay. And control means for controlling the display on the display means, For example, the control means, when the relay is energized, its upper
Status status of the located contact or trigger of the relay
A monitoring device for a sequence control circuit, which controls erasing the display of the status . 2. The control means, further comprising a storage means.
Is the status of each of the contacts, which is taken in through the input means.
Memory status and trigger status of each relay.
Stored in a column, and based on the stored contents of the storage means, the above table
2. The sequence control circuit monitoring device according to claim 1, wherein the display means is display-controlled . 3. The control means stores the data from the storage means.
Status of each contact or trigger of each relay
Read the status of each contact or relay
The trigger status of the
Status status or trigger status of each relay
Status status or relay of the contact located above it
Discriminate by referring to the trigger state of the
Claims, characterized in that the display control can the display means
2. The monitoring device for the sequence control circuit according to 2 . 4. The display means has a plurality of emission colors.
It is equipped with a light emitting means and corresponds to the light emitting state of the light emitting means.
It was the trigger status conditions and the relays of the respective contacts
-Displays the status, and the control means controls the sequence progress of the sequence control circuit.
Status status or reset of multiple contacts determined by
The color of the light emitted by the light emitting means is selected according to the trigger state of the ray.
The display means is selectively controlled.
The monitoring device for a sequence control circuit according to claim 1 .