JPH05298512A - Operating condition monitoring device - Google Patents

Abstract

PURPOSE:To perform a monitoring operation even when power failure occurs in facilities. CONSTITUTION:An operation monitoring motor 1 is to monitor the operating condition of the facilities that is a target of monitoring, and is equipped with a power failure detecting means, a data input circuit 21, a ring buffer 22, and a control part 23. The power failure detecting means is to detect whether or not the power failure occurs in a power source supplied to the facilities. The data input circuit 21 is to collect the operating condition sequentially as operating condition data. The ring buffer 22 invalidates a part of operating condition data in the neighborhood of a detecting timing when the power failure detecting means detects the power failure. The control part 23 outputs the operating condition data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operating condition monitoring device, and more particularly to an operating condition monitoring device for monitoring the operating condition of equipment to be monitored.

[0002]

2. Description of the Related Art In a factory that employs factory automation, in order to improve productivity, it is necessary to accurately grasp the status of equipment stoppages due to product or equipment malfunctions, identify the causes of equipment stoppages, and make improvements. is necessary. An operation management monitor as an operating condition monitoring device is used in order to grasp the stop situation and to pursue the stop cause. This operation management monitor records various signals from the equipment and monitors the operating status of the equipment and the occurrence status of defective products. Some types of monitors are supplied with power from equipment, and some are supplied with power separately from equipment.

In this type of operation management monitor, it is important to process the equipment when a power failure occurs. Conventionally, when the equipment has a power failure, the voltage drop immediately after the power failure is used as a trigger signal to collect and store the data at that time, and after the power is restored, it is read to check the consistency with the current state. Processes such as creating possessed data are performed.

[0004]

In the above-mentioned conventional configuration in which power is supplied from the equipment, the above processing is difficult when the timing of power failure is different between the equipment and the operation management monitor. In addition, since the voltage at the time of a power failure often causes chattering without a simple drop and drops in a wave shape, it is difficult to determine a power failure at a certain threshold value, and the above-described processing at the time of a power failure is difficult.

Further, when the equipment and the operation management monitor are separate power sources, the operation management monitor operates without power failure even when the equipment has a power failure, but random data is input to the operation management monitor when the equipment has a power failure. Therefore, it is not possible to determine whether the data is due to a power failure or true data, and the credibility of the data when the above processing is performed cannot be ensured.

An object of the present invention is to enable a normal monitoring operation even if the equipment has a power failure.

[0007]

An operating condition monitoring apparatus according to the present invention monitors the operating condition of equipment to be monitored, and comprises a power failure detecting means, a data collecting means, and an outputting means. The power failure detection means is for directly detecting the voltage of the power supply section of the equipment to detect whether or not the equipment has a power failure. The data collecting means is for sequentially collecting operating states as operating state data. The output means outputs the operating state data according to the detection result of the power failure detection means. Further, when the power failure detecting means detects a power failure, it is also possible to provide an invalidating means for invalidating a part of the operating state data near the detection timing.

[0008]

In the operating condition monitoring apparatus according to the present invention, when the power failure detecting means directly detects the voltage of the power supply section of the equipment to detect a power failure, the operating condition data sequentially collected by the data collecting means becomes the detection result. Is output accordingly. Since the power failure can be accurately detected here, erroneous data due to a transient phenomenon occurring at the time of the power failure can be easily discriminated, and the structure and internal processing of the device can be simplified.

Further, when the invalidating means is provided, a part of the data in the operation state data in the vicinity of the power outage detection timing is invalidated by the invalidating means when the power outage is detected. Then, only valid data is output by the output means. Here, since some of the operating state data at the time of power failure is invalidated, only normal data will be output even when a power failure occurs. Therefore, the reliability of the data is enhanced even during a power failure, and the monitoring operation can be performed normally.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 shows an operating condition monitoring system adopting an embodiment of the present invention. In the figure, an operation management monitor (hereinafter referred to as a monitor), which is an operation state monitoring device 1
Are attached to the processing machine 2, which is the equipment to be monitored. The monitor 1 is provided on the front with an operating rate / cycle time display section 3, a time / stop elapsed time display section 4, and a status display section 5 for displaying a stop cause number and the like. Further, below the time / stop elapsed time display portion 4, there is provided an input key group 6 for switching the display and referring to the stop time. Below the input key group 6, a memory card insertion slot 7 for inserting the memory card 8 is arranged.

The memory card 8 automatically records the collected data such as the stop time of the equipment, the number of stop times, and the number of productions.
The recorded data is sent to the personal computer (hereinafter referred to as a personal computer) via the card reader / writer 9.
It is possible to take in 10. On the personal computer 10,
With the application software, the data recorded in the memory card 8 can be automatically totaled, and the operating data analysis material such as the daily operating report and the Pareto chart can be printed out from the printer 11.

FIG. 2 shows a block configuration of the operating condition monitoring system. Directly from the power supply 12 to the monitor 1,
The voltage of DC24V is supplied. In addition, a DC 24V voltage is supplied from the power source 12 to the processing machine 2 via the breaker 13 and the control switch 14. further,
A voltage of 24 VDC is supplied to the sequencer 16 via the breaker 13 and the main switch 15.

The sequencer 16 is connected to the processing machine 2 and controls the processing machine 2 in sequence. Control switch 14
A control signal is output from the sequencer 16 to. The main switch 15 is turned on / off from the switch panel 17.
The FF signal is output. A switch panel 17 and a display panel 18 are connected to the sequencer 16, and various switch signals are output from the switch panel 17 to the sequencer 16 and various display signals are output from the sequencer 16 to the display panel 18. Is output. From the sequencer 16 to the monitor 1, various signals DA to be described later are provided.
~ DG is output. Further, a power failure monitoring input signal DH for detecting whether or not the power supplied to the sequencer 16 has a power failure is output to the monitor 1.

As shown in FIG. 3, the monitor 1 inputs the input signals DA to DH (data) collected from the sequencer 16 into 3 signals.
The data input circuit 21 that sequentially collects data every m seconds, the ring buffer 22 that temporarily stores the data collected by the data input circuit 21, and the data that is fetched from the ring buffer 22 and that is stored in the arithmetic unit 25 and the data storage circuit 24 And a control unit 23 that inputs and outputs.

Here, the signal DA is a data collection input signal, and the collection data during the period when this input signal is ON are recorded in the memory card 8. It should be noted that since one memory card 8 can only record data for one period during which it is turned on, the data collection signal DA
Once turned off, subsequent data cannot be recorded in the same memory card 8. Further, the signal DB is the reference operation input signal, the signal DC is the operation / stop input signal, and the signal D
D is a stop factor input signal, signal DE is a production pulse input signal, and signal DF is turned on once when a defective product is detected.
The signal DG is a code signal indicating the reason for occurrence of a defect. Further, the signal DH is an input signal for monitoring whether or not the target equipment has a power failure. When this is ON, the target equipment has not lost power.

The data input circuit 21 collects the input data only when all the input signals including the power failure monitoring input signal DH have the same input data three consecutive times. This is to prevent erroneous signals due to noise or the like from being collected. As shown in FIG. 4, the ring buffer 22 has a storage area of 101 bytes and can record signals DA to DG in 1 byte. However, the signal DH is directly input to the control unit 23 without passing through the ring buffer 22 as shown in FIG. When the start address A _s of the ring buffer 22 for example, "1", the destination address A _e is "102". In this ring buffer 22, when the data is read / written up to the end point address A _e , the data is next read / written in a ring shape from the top address again. The capacity of the ring buffer 22 is set to 101 bytes in order to read and discard 100 unreliable data collected before and after the power failure when the power failure occurs and when the power failure is restored. When data is collected every 3 msec, 300 msec of data can be stored in the ring buffer 22 (details will be described later). Normally, data stored 300 m seconds after being stored in the ring buffer 22 is processed as valid data. Signal D due to power failure
When H is turned off, the data for 300 msec immediately before the power failure can be invalidated by interrupting the process.

Next, when the signal DH is turned on, the data for one round of the ring buffer 22 is skipped to invalidate the data collected in 300 ms after the restoration of the power failure. Here, even if the power failure monitoring input signal DH is turned off due to noise or the like, as described above, for all the input signals DA to DH including the signal DH, the data input only when the input data for three consecutive times is the same. Since the data is collected, the data until the power failure or the signal DA is turned off can be surely recorded in the memory card 8 without erroneously recognizing the power failure.

The various data transferred to the control unit 23 are stored in the data storage circuit 24 and also given to the arithmetic unit 25. The arithmetic unit 25 is also provided with time data from the internal clock 26. In the calculation unit 25, the input data and the time data are connected to each other, and the year, month, day,
Time data of hours, minutes, and seconds can be added. The calculation result of the calculation unit 25 is given and displayed on the display units 3, 4, and 5. Further, the calculation result of the calculation unit 25 is recorded in the memory card 8 via the memory card interface 27.

On the other hand, an input signal from the input key 6 is given to the control section 23, and various input key processings such as switching the display on the display sections 3, 4 and 5 are performed according to the input signal. Next, the control operation of the control unit 23 will be described based on the flowcharts of FIGS. First, in step S1, the read pointer P _r indicating the read address of the ring buffer 22 and the write pointer P _w indicating the write address are both set to the head address A _s (= 1).
And a power failure flag Fl described later is reset to "0".

In step S2, it is determined whether or not the input key group 6 has been operated. If it is determined that the input key group 6 has been operated, the process proceeds to step S3, and the input key processing corresponding to the operated input key group 6 is performed. If no key is input, the process proceeds to step S4. Step S
At 4, other processing as a normal operation is executed. If a 3-msec timer interrupt is input during this main processing, the routine proceeds to the interrupt processing routine shown in FIG.

In step S5 of FIG. 6, of the data input to the data input circuit 21, the input signals DA to DG excluding the power failure monitoring input signal DH are written to the position indicated by the write pointer P _w . First, the write pointer P _w
Because is initially set to "1", the start address A _s
Input data is written in. In step S6, the write pointer P _w is incremented. Step S
In 7, the write pointer P _w incremented
Is equal to the end point address A _e (= 102). Until the data is written at the end of the ring buffer 22, the determination here is NO, and the process proceeds to step S8.

In step S8, the power failure monitoring input signal DH
It is determined whether or not a power failure has occurred by turning on and off. If there is no power failure, the process proceeds to step S9. In step S9, the read pointer P _r
And write pointer P _w are equal to each other. The determination here is NO for 100 times (300 msec) from the start of data collection, and the process returns to step S2 only by writing the data in the ring buffer 22. Step S
The processing from 5 to S9 is repeated 101 times, and the write pointer P _w is incremented by “10” in step S6.
When it becomes "2", the determination in step S7 becomes YES and the process proceeds to step S10.

In step S10, the write pointer
P_wIs the start address A_sIs set to. That is, 10
When 1 byte has been written, write pointer
P_wTo the top. Write poi in step S10
Center P_wIs the start address A _sSet to
If it is determined in step S8 that there is no power outage, step S
The determination in 9 is YES. At this time, the read point
Tar P_rAnd write pointer P_wTogether with "A_s=
1 ”. Every 3 msec thereafter, pointer P_rAnd point
Tar P_wAnd are 2, 3, 4 ... Format in step S9
If the determination is YES, the process proceeds to step S11.

In step S11, it is determined whether or not the power failure flag Fl is set. This power failure flag Fl
Is reset to "0" at the initial setting and is set to "1" when a power failure occurs. If it is not a power failure, the determination here is NO, and the routine goes to Step S12. In step S12, the data written in the ring buffer 22 is read out, and the data storage circuit 24 and the arithmetic unit 25 are read.
Output to. In step S13, the read pointer P _r is incremented. In this state, for example, P
_{Since w} = 1 and P _r = 2, P _r becomes a value larger by 1 than P _w . In step S13, the read pointer P _r
Is equal to the end point address A _e . That is, it is determined whether or not the data has been read up to the end address of the ring buffer 22. Until the data of 100 bytes is read, the determination here is NO and the process returns to the main routine. On the other hand, when the reading of the data of 100 bytes is completed, the determination here is YES, and the routine goes to Step S15. In step S15, the read pointer P
Set the value of _r in the value of the head address A _s returns to the main routine.

In the above processing, 10
Only writing to the ring buffer 22 is performed during 0 times (300 msec). After that, the values of the write pointer P _w and the read pointer P _r become the same value in step S9, and 300 m from the collection timing in step S12.
The data before the second is read. And the next step S
At 5, new collection data is written to that same address. In other words, the ring buffer 22 has the latest 300
Data for m seconds is stored.

Here, for example, the breaker 13 shown in FIG. 2 is turned off, or the main switch 15 is operated by the operator.
In case of disconnection, the fact is detected by the power failure monitoring input signal DH. Power failure monitoring input signal DH is O
If the state changes from N to OFF and it is determined in step S8 that there is a power outage, the process proceeds to step S16. Step S
In 16, the read pointer P _{r is set} to the start address A _s.
Set to (= 1). In step S17, the write pointer P _{w is set} to the head address A _s +1 (for example, “2”). In step S18, the power failure flag is set to "1". Here, the data is not stored in the ring buffer 22 by fixing the read pointer P _r to the head address A _s and the write pointer P _w to A _s + 1 during the power failure. During a power failure, steps S16-S1 are performed after steps S5-S8.
Only the 8 steps are repeated.

When the power failure is restored, the determination in step S8 becomes NO and the process proceeds to step S9. Immediately after the power failure is restored, since P _r = 1 and P _w = 3 in step S9 (because the pointer P _w is incremented in step S6), the determination in step S9 is NO,
Return to the main routine. When this loop is repeated 100 times, the value of the pointer P _w becomes “102”, the determination in step S7 becomes YES, and the value of the pointer P _w is set to “1” in step S10. Then,
The determination in step S9 is YES, and step S11
Move to. At this time, since the value of the power failure flag Fl is "1", the determination in step S11 is YES, and the process proceeds to step S19.

In step S19, the value of the power failure flag Fl is reset to "0". In other words, this power failure flag is
It is set to "1" when there is a power outage, and reset to "0" when 300 msec has elapsed after restoration. Blackout flag F
When l is reset, it returns to the main routine. Since the pointer P _w is incremented in the next step S6, the determination in step S9 becomes NO, and the loop of steps S2 to S9 is repeated until the data is written 100 more times in the ring buffer 22. As a result, the collected data for 300 msec after 300 msec after the power failure is restored is stored in the ring buffer 22. In other words, the data up to 300 msec after the restoration of the power failure is invalidated by overwriting.

When the determination in step S9 is YES again, the process proceeds to step S11. Here, since the power failure flag Fl is reset to "0", the determination is NO, and the process proceeds to step S12. As a result, in step S12, only the data written after 300 msec has elapsed from the power recovery is read. Thus, in this embodiment, the power failure monitoring input is turned off 300
Since the data from m seconds ago is invalidated, even if it is not possible to predict which of the data collection input and the power failure monitoring input will turn OFF first, when the equipment has a power failure, it is possible to collect incorrect data. Can be prevented. Further, even after the power failure is restored, unreliable data in a transitional period until the data is stabilized is invalidated for 300 msec after the power failure is restored, so that only highly reliable data can be collected.

The data input circuit 21 collects all the collected data including the power failure monitoring input only when the data is the same three times consecutively. Even if the input signal DH is momentarily turned off, correct data will not be invalidated. Also, for other input signals, only correct data can be collected without being disturbed by noise.

[Other Embodiments] (a) Although the monitor 1 is connected to the sequencer 16 in the above embodiment, the present invention is not limited to this, and the signals of the switch panel 17 and the control panel are not limited thereto. Alternatively, the signal of 18 and the sensor signal of the processing machine 2 may be directly input to the monitor 1. (B) In the above embodiment, the same power source 12 is supplied to the monitor 1, the sequencer 16 and the processing machine 2, but the monitor 1, the sequencer 16 and the facility 2 may be powered separately. (C) Although the ring buffer 22 is provided as the invalidating means in the above-described embodiment, the present invention is not limited to this, and the data stored in the data storage circuit 24 may be erased for a predetermined time when a power failure occurs. ..

[0032]

In the operating condition monitoring apparatus according to the present invention, since the power failure detecting means is newly provided, it is possible to easily discriminate erroneous data due to various transient phenomena occurring when the power failure of the equipment, and to improve the structure and internal processing of the apparatus. Can be easy.
Along with this, while the target equipment is out of power, it can be accurately recorded as a power outage.

Further, when the invalidation means is provided, when the power failure detection means detects a power failure of the equipment, a part of the operating state near the detection timing is disabled, so that unreliable data generated at the time of power failure is collected. Without doing so, only accurate data can be collected and normal monitoring operation can be performed.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of an operating condition monitoring system to which an embodiment of the present invention is applied.

FIG. 2 is a block configuration diagram thereof.

FIG. 3 is a block diagram of a monitor.

FIG. 4 is a diagram showing a storage area of a ring buffer.

FIG. 5 is a flowchart showing a control operation of a control unit.

FIG. 6 is a flowchart showing a control operation of a control unit.

[Explanation of symbols]

 1 monitor 2 processing machine 12 power supply 21 data input circuit 22 ring buffer 23 control unit 25 arithmetic unit 27 memory card interface

Claims (2)

[Claims] 1. An operating state monitoring device for monitoring the operating state of equipment to be monitored, for detecting whether or not the equipment is out of power by directly detecting the voltage of the power supply section of the equipment. A power failure detecting means, a data collecting means for sequentially collecting the working status as working status data, and an output means for outputting the working status data according to a detection result of the power failure detecting means. Monitoring equipment. 2. The operating status monitoring device according to claim 1, further comprising invalidating means for invalidating a part of the operating status data near the detection timing when the power failure detecting means detects the power failure. ..