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Communication system

A communication system and field device technology, applied in the field of communication systems, can solve problems such as large number of transmission lines, difficult to handle, and complexity, and achieve the effect of reducing costs

Inactive Publication Date: 2010-12-08
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, every time a new device is added and the devices are connected with the best communication, the number of transmission lines becomes large due to the mixture of various communication forms in the whole, making it a complicated and difficult system

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] exist Figure 1 to Figure 8 In , the first embodiment of the communication system related to the present invention is shown.

[0035] figure 1 Shows the structure of the communication system related to the present invention.

[0036] exist figure 1 In the communication system, the communication system is composed of the field device 100 , the control device 160 , the graphical user interface device 190 and the gateway 195 .

[0037] The field device 100 is composed of i measurement components of the measurement components 111 to 11i, j drive components of the drive components 121 to 12j, and a measurement collection component 130 that collects the measurement components 111 to 11i, and drives the drive components 121 to 12j. The unit 12j, the drive control unit 140 that acquires data from the drive unit 121 to the drive unit 12j, and the switch hub (Switch Hub) 150 that controls the switching between the measurement collection unit 130 and the drive control unit 140 ...

Embodiment 2

[0081] exist Figure 9 Among them, 901~904 are the period of sending periodic frame respectively, the value of timer 249 and Figure 5 Similarly, as in 911 to 914 , the periodic frame transmitted from the periodic frame transmission unit 230 to the controller 181 is periodically transmitted at the beginning of the period. In cycle 901, a request from the controller 181 of the control device 160 to the drive control part 140 of the field device 100 is intended to be sent, but because there is not enough cycle remaining time for the sending status requests 921 to 923, it cannot be sent. Timer 249 value. At this time, through Figure 7 Calculate the amount that can be sent in the remaining time of the cycle by a straight line in the figure, divide it by its size, send the divided frame 921, and postpone the remainder to the next cycle 902.

[0082] In the cycle 902, the response 932 to the split frame 921 is sent from the drive control part 140 of the field device 100 to the c...

Embodiment 3

[0085] exist Figure 10 Among them, 1001-1004 represent the period of sending the periodic frame respectively, and 1011-1014 represent the sending periodic frame. Figure 10 The third exemplary embodiment shown shows an example in which the timer 249 of the controller 181 of the control device 160 and the timer 249 of the measurement collection unit 130 of the field device 100 deviate.

[0086] So, in Figure 10 In the third embodiment shown, when the transmission of the normal frame 1022 of the synchronization request sent from the controller 181 of the control device 160 to the measurement integration unit 130 of the field device 100 ends, the communication with the controller 181 of the control device 160 is completed. The value of the timer 249 of the measurement collection unit 130 of the field device 100 is changed so that the value of the timer 249 is consistent. The condition of the change can be every cycle, or the difference between the value of the timer 249 of th...

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PUM

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Abstract

The invention provides a communication system which can transmit a periodic frame and a normal frame on a same transmission line without deteriorating a transmitting efficiency. In a communication system connecting a plurality of devices having a transmission function and a reception function, a transmission data frame is classified into a periodic frame and a normal frame. The periodic frame is a frame transmitted periodically with a fixed time interval without requesting a reception device to transmit a reception confirmation response. The normal frame is a frame requesting the reception device to transmit the reception confirmation response by a non-periodic transmission, and transmits the periodic frame with a fixed period. When the normal frame is transmitted after a driving request response based on a driving request, and when the normal frame can not be transmitted within the concerned period, it is transmitted after the transmission of the periodic frame of a subsequent periodand is transmitted on the same transmission line.

Description

technical field [0001] The present invention relates to a communication system, and more particularly, to a communication system that controls a communication frame that transmits data used when controlling various devices. Background technique [0002] In a large-scale system in which various control devices are used to control many devices in existing substations, railways, factories, etc., each device is controlled by a communication system. Therefore, in such a large-scale system, a communication system that connects devices constituting the system plays an important role. [0003] As the communication of the devices connected to the communication system connecting the devices constituting the system, serial communication, fieldbus, bus-type LAN, and other special communication dedicated to control, etc. different communication. However, every time a new device is added and the devices are connected with the best communication, the number of transmission lines becomes ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L5/16
Inventor 吉田昌司齐藤雅彦城戶三安大西欣四郎
Owner HITACHI LTD