| 摘要 |
<P>PROBLEM TO BE SOLVED: To perform synchronization between units with high accuracy without increasing bundled cords by bringing common time managed by respective units into line by a data communication line, in a distributed controller controlled by the distributed units. <P>SOLUTION: A serial communication means connected to a CPU is connected to both of an interrupt control terminal and a reception terminal of the CPU on a control unit side performing reception. It is selectively changed over whether the serial communication means is used for serial communication using the reception terminal or for an interrupt using the interrupt control terminal for bringing the time of a time management means into line, so as to allow use. According as the control unit receives a predetermined command, the serial communication means is changed over to the means for the interrupt, and time data managed by the time management means of the control unit are rewritten to prescribed time. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
