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Cyclic data transmission method

  • US 5,068,849 A
  • Filed: 10/06/1989
  • Issued: 11/26/1991
  • Est. Priority Date: 03/09/1989
  • Status: Expired due to Fees
First Claim
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1. A cyclic data transfer method for controlling transmission and reception of control data in a loop shaped transfer line forming a network by means of a plurality of stations which are connected to the loop shaped transfer line and to each of the stations are connected outer control devices respectively, updating a synchronous data frame queued in a transmission buffer memory with data stored in a transmission area of a cyclic memory in each of said stations, and transmitting the synchronous data frame from said buffer memory to all of said plurality of stations, said cyclic data transfer method comprising the steps of:

  • producing a synchronous data frame of a fixed length in each of the stations from high speed cyclic data and a prescribed portion of low speed cyclic data so as to be transmitted by acquiring a token;

    sequentially loading said prescribed portion of said low speed cyclic data into the synchronous data frame so as to complete transmission of all said low speed cyclic data over several synchronous data frame transmissions; and

    transmitting the synchronous frame of said fixed length into which said high speed cyclic data and said low speed cyclic data are integrated, upon the acquisition of said token.

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