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Control device, time stamp modification method and recording medium

A technology of control device and time stamp, applied in the direction of program control, computer control, general control system, etc., can solve the problems of heavy communication load, inability to calculate time stamp, and decreased efficiency.

Active Publication Date: 2018-11-23
ORMON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the number of devices in the system increases, the communication load increases and efficiency decreases.
In addition, in the process of integrating data (data mining) between multiple systems, the synchronization between data cannot be guaranteed
In addition, if the communication between the devices is not possible, the normalized timestamp cannot be calculated

Method used

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  • Control device, time stamp modification method and recording medium
  • Control device, time stamp modification method and recording medium
  • Control device, time stamp modification method and recording medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0052] figure 1 It is a diagram showing an example of a control system including the control device of the embodiment. The control system is installed in the base 1000, such as a factory and a distribution warehouse, for example. The control system is equipped with PLC100 which is an example of a control apparatus, and the computer (PC) 200 communicably connected to this PLC100 via LAN(Local Area Network: local area network) 3.

[0053] For example, a program for causing PC 200 to execute the procedure and method according to the embodiment can be installed in PC 200 from recording medium 30 such as a CD-ROM. The CD-ROM 30 is a medium that can optically record information such as programs and the like recorded in computers, other devices, machines, and the like so that the information of the programs and the like can be read. In addition to this, a medium capable of recording various data through electric, magnetic, mechanical, or chemical actions may also be used.

[0054]...

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PUM

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Abstract

The invention discloses a control device, a time stamp modification method and a recording medium, which can acquire data to which an accurate time stamp has been assigned. Data is recorded to a time-series database (102b) embedded in a PLC (100). Furthermore, a local clock of the PLC (100) is corrected by accessing a time server (400) such as an NTP server on a regular basis. At that time, a timecorrection amount and an NTP-ID for identifying each iteration of correction processing are recorded to an NTP log (102a) in association with each other. When a query arrives, the time stamp of a record corresponding to a designated time range is modified by proportionally distributing the time correction amount of the corresponding NTP-ID.

Description

technical field [0001] Embodiments of the present invention relate to, for example, a control device, a time stamp correction method, and a recording medium applicable to FA (Factory Automation). Background technique [0002] Many factories, distribution bases, and the like are equipped with control systems for controlling various facilities and machines. By properly using the control system and the control device, it is possible to save labor and improve work efficiency. A programmable logic controller (Programmable Logic Controller: PLC) is known as a control device that can withstand severe environments. [0003] A PLC has a processor and a memory, and is a computer that operates according to a program. The research related to PLC programming language is led by IEC SC65B / WG7 / TF3. In 1993, the international standard "IEC 61131-3" was released. This standard defines "four languages ​​+ one element" including the conventional ladder language, and recent PLCs have been dev...

Claims

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Application Information

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IPC IPC(8): G05B19/042
CPCG05B19/0423G05B2219/25257G06F17/40G06F16/2474G06F16/2365G06F16/2282G06F16/2477G06F1/14
Inventor 川之上真辅
Owner ORMON CORP
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