Sending device, receiving device, communication control device, communication system, and communication control method

a communication control device and receiving device technology, applied in the field of communication control devices, can solve the problems of insufficient attention to the demand for high safety, limitations on the improvement of safety, and insufficient attention to the need for high safety, so as to reduce the missed error detection rate, reduce the missed error correction rate, and high safety

Inactive Publication Date: 2007-01-04
HITACHI LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a system and method for improving safety and reliability in data communication. The system includes a sending device, a receiving device, and communication control devices that can match and compare data to detect errors and masquerading. The system also allows for high safety and reliability in functional safety systems. The system can be used in various communication control devices and can be configured to provide both high safety and availability. The technical effects of the invention include reducing missed error detection rates, improving safety levels, and detecting masquerading.

Problems solved by technology

Since the aforementioned prior art does not perform a matching comparison of the body of the data, there are limitations on improvements in safety.
Specifically, the demand for high safety is not sufficiently addressed.
Since the aforementioned prior art does not carry out a matching comparison at the data sender, there are limitations on improvements in safety.
Because of this, the device did not only increase in size, but the duplication and increased complication of the work of putting into operation and maintenance brought about a reduction in the reliability of the human element.

Method used

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  • Sending device, receiving device, communication control device, communication system, and communication control method
  • Sending device, receiving device, communication control device, communication system, and communication control method
  • Sending device, receiving device, communication control device, communication system, and communication control method

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Embodiment Construction

[0042] Below, embodiments of the present invention will be explained.

[0043] A system using a communication control device of an embodiment of the present invention is shown in FIG. 1.

[0044] The inventive system consists of a sending device 1, a first-type communication line 21, a second-type communication line 22, a receiving device 3, an output circuit A 41, an output circuit B 42, and a control object 5.

[0045] Sending device 1 consists of a CPU (Central Processing Unit) 11, a memory 12, a DMAC (Direct Memory Access Controller) 13, a first-type sending circuit 141, a second-type sending circuit 142, and a sending sequencer 15.

[0046] The details of memory 12 will be explained using FIG. 2.

[0047] In memory 12, there is allocated an output area A 121, an area for carrying out control of output circuit A 41.

[0048] Output area A 121 consists of output data 1211, a safety flag 1212 indicating whether the output data are a safety function, a data error detection code 1213, and a val...

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Abstract

The system has, provided in a sending device, a generator generating transmission data including data, a data error detection code generated from the data and a safety flag indicating a degree of reliability, and transmission data; has, provided in a receiving device, a plurality of components of extracting transmission data, a safety flag, and a data error detection code from a received frame, and detecting a data error, a comparator comparing the matching of a plurality of received frames, and a selector selecting one received frame, from the frame error detection result, the safety flag, the data error detection result, and the matching comparison result; and determines the validity of transmitted data by the detection corresponding to the degree of reliability set with the safety flag.

Description

FIELD OF THE INVENTION [0001] The present invention pertains to a sending device, a receiving device, a communication control device, a communication system, and a communication control method. BACKGROUND OF THE INVENTION [0002] In recent years, the demand for using, in process control systems, programmable electronically controlling devices which are not only limited to the control of primary plant functions (general functions) but also encompass control with respect to safety functions regarding human life and the environment has intensified. In the control of safety functions, safety is demanded, so for that reason, for one safety indicator with respect to data communication between devices, error detection matching is used and error correction is performed. [0003] However, there is demanded an improvement in the missed error detection rate, the probability of not detecting an error even with error detection, so in order to implement safety, technology has been devised in which t...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): G06F11/00
CPCH04L1/0046
InventorONOZUKA, AKIHIROISHIKAWA, MASAKAZUKOBAYASHI, MASAMITSUUMEHARA, TAKASHIKOKURA, SHINENDOH, HIROMICHIFUNAKI, SATORUNAGAYAMA, HISAOSHIRAISHI, MASAHIROBANDO, AKIRAKOBAYASHI, EIJIFURUTA, YASUYUKIMASHIKO, NAOYA
OwnerHITACHI LTD