JPH09198323A - Data logger device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To unify the timing of data collection even when plural computers are provided. SOLUTION: The plural computers 4-1 , 4-2 and 4-3 of data collection/ accumulation are set to be a master 4-1 and slaves 4-2 and 4-3 . Data from a measuring instrument 2 and a controller 3 is logged in the master computer 4-1 through control LAN 11. The slave computers 42 and 43 collate to logging time of data on the master computer 4-1 through information LAN 12 and collect/accumulate latest data on the master computer 4-1 through information LAN 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data logger device in which one or more measuring instruments are connected to a plurality of data collecting / accumulating computers via a communication network.

[0002]

2. Description of the Related Art A conventional data logger device is shown in FIG.
Measuring instrument 2 connected to communication network 1
Is connected to the controller 3 and also to the communication network 1.
Multiple computers 4_-1, 4_-2, ..., 4_-nFrom
There is something. In this data logger device,
(Or the controller 3) regularly communicates with the network.
Send as broadcast communication (broadcast communication) to KU1
Computer 4 _-1, 4_-2, ..., 4_-nIs given
Capture / store in collection buffer at data logging timing
It is piled up.

Incidentally, the reason why the plurality of computers are configured in this way is that even if one computer fails, the data logging can be continued by the other computers, and the operating rate of the entire data logger device is increased. Is intended to improve.

[0004]

In the above-described conventional data logger device, since the delicate collection timing differs between computers, as a result, delicate differences in the logging data occur between computers. When performing the integration process in the controller, the computer had to instruct the controller to perform the reset process after collecting the data, but when there are multiple computers, it cannot be determined which computer's acquisition timing should be the reference. There was a problem.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a data logger device which can unify the timing of data collection even if it has a plurality of computers.

[0006]

In the data logger device of the present invention, a measuring device for measuring data is connected to a communication network, and the measured value measured by the measuring device is taken in and stored in a computer via the communication network. In, connecting multiple computers to the communication network,
The master computer collects and accumulates the measurement values of the measuring instrument while the master computer collects and accumulates the measurement values of the measuring instrument, and the slave computer collects and accumulates the measurement values of the master computer through the communication network. I am trying to capture and accumulate values.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to embodiments. FIG. 1 is a block diagram showing the configuration of a data logger device according to an embodiment of the present invention.
The data logger device of this embodiment includes a measuring instrument 2 connected to a control LAN 11, a controller 3, and a control L.
Computers 4 _-1 , 4 _-2 , 4 connected to the AN 11
_-3, and a printer 5 connected to these three computers 4 _-1 , 4 _-2 , 4 _-3 via the information LAN 12.

Three computers 4_-1, 4_-2, 4_-3Is 1
One is a master computer and the other two are slave computers.
Operates as a data server. Which computer is the master
It can be a computer, but initially, for example,
Computer with a small number 4 _-1The master computer
The master computer and its communication system
The next slave computer to the new master computer.
Switch to the data.

Master / slave switching is performed as follows.
It is done. Master computer 4_-1Then do it yourself
Have a program and a control LAN program
You. For a program that should be executed by itself,
Program is executed and there is no abnormality in its processing
Resets the timer each time. On the other hand, control LA
The N program performs general control LAN processing, and
Decrement the timer value by 1. And the timer value is 0
Is determined. Master computer 4_-1Is normal
If so, each time the above-mentioned program that should be executed by itself is executed
Since the timer is preset, if the timer value is 0
Therefore, the determination as to whether the above timer value is 0 is NO.
The master computer continues to operate as it is.
Master computer 4_-1If the processing of the
No preset is done, only the subtraction of the timer as it is
Since it can be continued, the value of the timer eventually becomes 0. That
Therefore, the judgment of whether the timer value is 0 is YES, and the master controller
Pewter 4 _-1Interrupts control LAN communication.

The slave computers 4 _-2 and 4 _-3 monitor the control LAN communication of the master computer 4 _-1 , and the communication abnormality is judged by the monitoring. When the master computer _4-1 interrupts the control LAN communication due to its own abnormality, the slave computers _4-2 and 4 which monitor this interrupt the control LAN communication.
_-3 is switched slave computer 4 _-2 master computer. For this switching, the slave computer 4 _-3 may be switched to the master computer by another determination method.

[0011] Then, the master computer _4-1, the logging operation of the above embodiment the data logger device if the slave computer 4 _-2, 4 _-3 explained. As shown in FIG. 2, logging of data from the measuring instrument 2 and the controller 3 via the control LAN 11 is performed only by the master computer 4 _-1 . Further, each slave computer 4 _-2, 4 _-3, as shown in FIG. 3, the information the last collection time and last collection time of logging data of the master computer 4 _-1 logging data owns the self-LA
N12 collated through, if there is the latest collected data to the master computer _4-1, the slave computer 4 _-2, 4 logging data not held _-3 via the information LAN12 from the master computer 4 _-1 Collect and accumulate.

When data logging is performed, the master computer 4 _-1 issues a totalizing reset command to the controller 3 after data collection, as shown in FIG.
Further, the collection result data logger, in the case of output printers on a regular basis as for example daily, etc., as shown in FIG. 5, via the information LAN12 from the master computer _4-1, and outputs to the printer 5.

[0013]

According to the present invention, a plurality of computers are connected to a communication network, and means for determining a master computer and a slave computer among the plurality of computers is provided, and the master computer collects measurement values of measuring instruments. Since the slave computer captures and accumulates the measurement values collected and accumulated by the master computer via the communication network while accumulating, logging data can be made the same among a plurality of computers. Moreover, by multiplexing the stored data with a plurality of computers, a data logger device that is resistant to failures is provided. Also,
By automatically switching the master computer, the operator can continue operation without being aware of the master computer and slave computers.

[Brief description of drawings]

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

FIG. 2 is a diagram for explaining data logging from a measuring instrument or the like in the data logger device according to the same embodiment.

FIG. 3 is a diagram for explaining data collection to a slave computer in the data logger device according to the first embodiment.

FIG. 4 is a diagram for explaining integration reset to a controller in the data logger device according to the same embodiment.

FIG. 5 is a diagram for explaining how data is dropped into a printer in the data logger device according to the first embodiment.

FIG. 6 is a block diagram for explaining a conventional data logger device.

[Explanation of symbols]

2 Measuring Instruments 3 Controller 4 _-1 Computer (Master) 4 _-2 4 _-3 Computer (Slave) 11 Control LAN 12 Information LAN

Claims (1)

[Claims] 1. A data logger device in which a measuring instrument for measuring data is connected to a communication network, and a measurement value measured by the measuring instrument is taken into and stored in a computer via the communication network, and a plurality of computers are connected to the communication network. The master computer collects and stores the measured values of the measuring instrument while the slave computer collects and stores the master computer via the communication network. A data logger device characterized in that the measured values are taken and accumulated.