| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a control network management system which avoids tampering attempted by a third party and allows a signal of process control wireless communication of which the real-time responsiveness is required and a signal of which the real-time responsiveness is not required to coexist on the same network. <P>SOLUTION: The control network management system relays a first wireless communication in conformity with IP (Internet Protocol) and a process control wireless communication standard and a second wireless communication in conformity with IP and a wireless communication standard different from the standard. The system includes: a first repeater for writing priority information in a header of a packet of the first wireless communication, as received and transmitting the packet with a hash value of the header, added thereto; a second repeater for zero-clearing priority information in a header of communication packet data of the second wireless communication, as received, or changing the priority information to a predetermined value, adding a hash value of the header and transmitting the packet; and a third repeater for performing priority control on the basis of priority information of the header of each packet received from the first repeater or the second repeater, thereby transmitting the packet data to a control system. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
