| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve the problem of a delay in the transmission timing of a control command in a communication control device and a control device connected by a network, because of the transmission timing to retransmit a non-control command to the control device, such as the acquisition of management information and operating information, or a control command. <P>SOLUTION: The communication control device for communicating with one or a plurality of control devices through the network includes: a non-constant period transmission unit which generates a transmission request at an arbitrary time; a constant period transmission unit which generates a transmission request at a constant period; a communication unit which exchanges transmission data in the non-constant period transmission unit and the constant period transmission unit with the network; and a schedule unit which transmits the transmission content of the constant period transmission unit to the communication unit, calculates a communication processing time required for communication processing by the non-constant period transmission unit requesting transmission, obtains a residual time of the constant period in the constant period transmission unit, and compares the communication processing time with the residual time of the constant period, so as to transmit the transmission content of the non-constant period transmission unit to the communication unit. <P>COPYRIGHT: (C)2012,JPO&INPIT |
