| 摘要 |
<P>PROBLEM TO BE SOLVED: To allow each control terminal to shift into a halt state by its own determination in a distribution system wherein each control terminal has hierarchic structure. <P>SOLUTION: Control terminals 1-4 transmit "halt requests" to control terminals 5, 6, 7 of high order when shifting into the halt state, and the control terminals 5, 6, 7 receiving the "halt requests" return "NG" when processing depending on the terminals 1-4 that transmitted the "halt requests" is under execution, and return "OK" otherwise. <P>COPYRIGHT: (C)2008,JPO&INPIT |
