Communication apparatus, synchronous communication system, communication interference suppress method and computer-readable recording medium recorded with communication interference suppress program to suppress interference between plurality of synchronous communication systems in same space

A communication interference suppress method to suppress interference of communication in each of a plurality of adjacent synchronous communication systems including one control apparatus and at least one controlled apparatus carrying out synchronous communication with said control apparatus under control of said control apparatus in a predetermined order, said method comprising in said control apparatus:

• a transmission step of transmitting a packet stored with control information to said at least one controlled apparatus,
• a reception step of receiving at least a packet stored with response corresponding to contents of the packet transmitted by said transmission step from said at least one controlled apparatus,
• an error count step of counting the number of said synchronous communication errors occurred and the number of times a packet from said at least one controlled apparatus was not received in said reception step within a constant period carrying out said synchronous communication with said at least one controlled apparatus,
• a packet count step counting how many of packets transferred in another said synchronous communication system is received in said reception step in said constant period, and
• a communication timing adjust step of adjusting timing of said synchronous communication according to a predetermined procedure based on count results of said error count step and said packet count step.

A communication apparatus provided at each of a plurality of adjacent synchronous communication systems,

• each of said plurality of synchronous communication systems including one said communication apparatus, and at least one controlled apparatus carrying out synchronous communication with said communication apparatus and controlled,
• wherein said communication apparatus comprises
• a transmission unit transmitting a packet stored with control information to said at least one controlled apparatus,
• a reception unit receiving at least a packet stored with response corresponding to contents of the packet transmitted by said transmission unit from said at least one controlled apparatus,
• an error count unit counting the number of synchronous communication errors occurred and the number of times a packet from said at least one controlled apparatus was not received by said reception unit within a constant period carrying out said synchronous communication with said at least one controlled apparatus,
• a packet count unit counting how many of packets transferred in another said synchronous communication system is received by said reception unit in said constant period, and
• a communication timing adjust unit adjusting timing of said synchronous communication according to a predetermined procedure based on count results of said error count unit and said packet count unit.

A computer-readable recording medium recorded with a communication interference suppress program to be executed with a computer of a communication interference suppress method to suppress interference of communication in each of a plurality of adjacent synchronous communication systems including one control apparatus and at least one controlled apparatus carrying out synchronous communication with said control apparatus under control of said control apparatus in a predetermined order, said communication interference suppress method comprising in said control apparatus:

• a transmission step of transmitting a packet stored with control information to said at least one controlled apparatus,
• a reception step of receiving at least a packet stored with response corresponding to contents of the packet transmitted by said transmission step from said at least one controlled apparatus,
• an error count step of counting the number of synchronous communication errors occurred and the number of times a packet was not received from said at least one controlled apparatus in said reception step within a constant period carrying out said synchronous communication with said at least one controlled apparatus,
• a packet count step counting how many of packets transferred in another said synchronous communication system is received in said reception step in said constant period, and
• a communication timing adjust step of adjusting timing of said synchronous communication according to a predetermined procedure based on count results of s aid error count step and said packet count step.

Synchronous communication systems including one control apparatus and at least one controlled apparatus carrying out synchronous communication with said control apparatus under control of said control apparatus in a predetermined order, each of a plurality of said synchronous communication systems is located adjacently, said synchronous communication system comprising in said control apparatus:

• a transmission means for transmitting a packet stored with control information to said at least one controlled apparatus,
• a reception means for receiving at least a packet stored with response corresponding to contents of the packet transmitted by said transmission means from said at least one controlled apparatus,
• an error count means for counting the numbers of synchronous communication errors occurred and the number of times a packet from said at least one controlled apparatus was not received by said reception means within a constant period carrying out said synchronous communication with said at least one controlled apparatus,
• a packet count means for counting how many of packets transferred in another said synchronous communication system is received by said reception means in said constant period, and
• a communication timing adjust means for adjusting timing of said synchronous communication according to a predetermined procedure based on count results of said error count means and said packet count means.

A communication apparatus provided at each of a plurality of adjacent synchronous communication systems,

• each of said plurality of synchronous communication systems including one said communication apparatus, and at least one controlled apparatus carrying out synchronous communication with said communication apparatus and controlled,
• wherein said communication apparatus comprises
• a transmission means for transmitting a packet stored with control information to said at least one controlled apparatus,
• a reception means for receiving at least a packet stored with response corresponding to contents of the packet transmitted by said transmission means from said at least one controlled apparatus,
• an error count means for counting the number of synchronous communication errors occurred and the number of times a packet from said at least one controlled apparatus was not received by said reception means within a constant period carrying out said synchronous communication with said at least one controlled apparatus,
• a packet count means for counting how many of packets transferred in another said synchronous communication system is received by said reception means in said constant period, and
• a communication timing adjust means for adjusting timing of said synchronous communication according to a predetermined procedure based on count results of said error count means and said packet count means.