JP2000330625A - Event collecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To precisely collect event data without providing any high precise timer. SOLUTION: This event controlling device constituted so that the event data of an event signal can be collected is provided with plural event inputting parts 10 having counters 11, which respectively inputs an event signal, and obtains event data from the changing point of the event signal by adding the count value of the counter 11 to the changing point, and a reference preparing means 22 which inputs the count value of the counter 11 at the changing point of the time of a timer means 21, and calculates a unit count time from the number of counts between the changing points of the time, and obtains the time of the timer means 21 as a reference time, and obtains the count value as a reference count value, and an event time means 23 which obtains (the reference time) + (the count value of the event data) - (the reference count value)) × (a unit count time) as the event time of the event data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an event collection device used for a plant control device, for example, and more particularly to an event collection device capable of collecting event data with high accuracy without providing a high-precision timer.

[0002]

2. Description of the Related Art A plant control apparatus stores a state change of a field signal (event signal), for example, a change of a relay or the like, together with a time, and performs display. Such a device is shown in FIG. 4 and described.

In FIG. 1, a field control unit (FCU) 1 is connected to a local I / O bus.
The plurality of I / O cards 2 have a high-precision timer 3 and are connected to a local I / O bus.

[0004] The operation of such a device will be described below.
The I / O card 2 receives an event signal from a plant (field) and sets a change point of the event signal to event data by adding the time of the high-precision timer 3. And
The FCU 1 collects event data from the I / O card 2 and sends the event data to a server (not shown).
The event data is read out from the server and displayed and the like.

As shown in FIG. 5, a plurality of I / O cards 4 are connected to a local I / O bus. Then, the high-precision timer 5 connects to the local I / O bus,
The time is notified to the card 4.

The operation of such a device will be described below.
The I / O card 4 receives an event signal from a plant (field) and sets a change point of the event signal to event data by adding a time from the high-precision timer 5. The FCU 1 collects event data from the I / O card 4 and sends the event data to a server (not shown). The event data from this server is read and displayed.

[0007]

In such a device,
Since there are many event data collection points, the time cannot be added on the FCU 1 side, and the time is added to the event data on the I / O cards 2 and 4 using the high precision timers 3 and 5. As a result, the time can be accurately obtained, and I
The time error between the / O cards is suppressed. However, since the high-precision timers 2 and 5 are used, there is a problem that the apparatus becomes expensive.

An object of the present invention is to provide an event collecting apparatus capable of collecting event data with high accuracy without providing a high-precision timer.

[0009]

According to the present invention, there is provided an event collecting apparatus for collecting event data of an event signal, comprising a counter, inputting the event signal, determining a change point of the event signal, and determining a count value of the counter. In addition, a plurality of event input units which are used as event data, timer means, and a count value of the counter at a time change point of the timer means are input, and a unit count is calculated based on the number of counts between the time change points. The time is obtained, the time of the timer means is set as a reference time, and the reference value is set as a reference count value, and the unit count time, the reference time, the reference count value, and the event of the event input unit are set. Enter the data and (reference time) +
An event time means for setting ((count value of event data) − (reference count value)) × (unit count time) as the event time of the event data.

[0010] In the present invention as described above, the reference creating means includes:
At the time change point of the timer means, the count value of the counter is input, and the unit count time is obtained from the count number between the time change points. The reference creation unit sets the time of the timer unit as the reference time and sets the count value as the reference count value.

Then, the event input section inputs the event signal, and changes the event signal by adding the count value of the counter to event data. The event data is input to the event time means, and the unit time, reference time, and reference count value of the reference creation means are used to obtain (reference time) + ((event data count value).
− (Reference count value)) × (unit count time) is obtained and set as the event time of the event data.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram showing one embodiment of the present invention.

In FIG. 1, a plurality of I / O cards (event input units) 10 are connected to a plant (field) (not shown).
, An event signal is input to the local I / O bus B, and a change point of the event signal is used as event data.
The I / O card 10 has a high resolution, for example, 0.
25 msec resolution counter 11 and event capture unit 1
And 2.

The event fetching section 12 adds a count value of the counter 11 to a change point of the event signal to obtain event data.

An FCU (event collection unit) 20 connects to the local I / O bus B and collects event data from the I / O card 10. The FCU 20 has a timer unit 21, a reference creation unit 22, and an event time unit 23.

The timer means 21 generates time using a real-time clock having a lower resolution than the counter 11, for example, a resolution of 1 msec. Standard creation means 22
Input the count value of the counter 11 at the time change point of the timer means 21, obtain the unit count time from the count number between the time change points, use the time of the timer means 21 as the reference time, The value is used as the reference count value. The event time means 23 inputs the unit count time of the reference creation means 22, the reference time, the reference count value, and the event data of the event capturing unit 12, and (reference time)
+ ((Count value of event data) − (reference count value)) × (unit count time) is defined as the event time of the event data.

The operation of such a device is described below.
FIG. 2 is a flowchart showing the operation of the reference creating unit 22. FIG. 3 is a flowchart showing the operation of the event time means 23.

The reference creating means 22 uses the time of the timer means 21 as a reference point at a time change point of the timer means 21, for example, at regular intervals (S1, S2). Then, the reference creating unit 22 reads the current count value from the counter 11 via the local I / O bus B (S3). The reference creation unit 22 calculates (count number) = (reference count value)
-(Current count value) is obtained (S4). Here, the reference count value is the reference count value obtained last time.
Based on the count number, the reference creation unit 22 calculates (unit count time) = (reference time update time) / (count number)
(S5). Then, the reference creating unit 22 sets the current count value as the reference count value (S6). Such an operation is performed for each I / O card 10.

The event fetch unit 12 inputs an event signal from a plant (field), and sets a change point of the event signal by adding a count value of the counter 11 to event data.

The event time means 23 is a local I / O
Event data is collected from a plurality of event capturing units 12 via the bus B. Then, for each I / O card 10, the event time means 23 uses the unit count time, reference time, and reference count value of the reference
(Reference time) + ((event data count value)-
(Reference count value)) × (unit count time)
Event time.

The event time means 23 adds the event time to the event data instead of the count value, and sends the event data to a server (not shown).

As described above, the reference creating means 22 obtains the count number of the counter 11 between the time change points of the timer means 21, calculates the unit count time, and uses the unit count time to calculate the unit count time. The event time is obtained from the count value. Therefore, a time error due to the error of the counter 11 can be suppressed. Also, I /
Errors due to variations in the counters 10 between the O-cards 10 can also be suppressed. That is, the event time can be obtained with high accuracy without using a high-precision timer (counter).

[0023]

According to the present invention, the following effects can be obtained. The reference creation means calculates the count number of the counter between the time change points of the timer means, calculates a unit count time, and uses the unit count time to determine the event time from the count value of the counter. For this reason, a time error due to a counter error can be suppressed.
Further, it is possible to suppress an error due to a variation in the counter between the event input units. That is, the event time can be obtained with high accuracy without using a high-precision timer (counter).

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of the present invention.

FIG. 2 is a flowchart showing an operation of a reference creation unit 22.

FIG. 3 is a flowchart showing an operation of an event time means 23.

FIG. 4 is a configuration diagram of a conventional event collection device.

FIG. 5 is a configuration diagram of another conventional event collection device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 I / O card 11 Counter 12 Event taking part 20 FCU 21 Timer means 22 Reference creation means 23 Event time means

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] May 19, 1999 (1999.5.1
9)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

Claims (2)

[Claims] 1. An event collecting apparatus for collecting event data of an event signal, comprising a counter, inputting the event signal, and setting a change point of the event signal by adding a count value of the counter to the event data. A plurality of event input units; timer means; and a count value of the counter at a time change point of the timer means.
A reference creation unit that obtains a unit count time, uses the time of the timer unit as a reference time, and uses the count value as a reference count value, and a unit count time, a reference time, a reference count value, and the event input unit Event time means for inputting (reference time) + ((count value of event data) − (reference count value)) × (unit count time) as event time of event data. A featured event collection device. 2. The event collection device according to claim 1, wherein synchronization with another device is achieved by the time of the timer means.