| 摘要 |
PROBLEM TO BE SOLVED: To provide a plant monitoring control device for improving the using efficiency of a system bus without giving any hindrance to the operation of a master card, and for reducing the load of the master card.SOLUTION: A master card 1 includes a bus use permission signal generation part 14 and a bus use permission signal transmission part 15, and each of sub-cards 2 includes a bus use permission signal reception part 24 and a bus use permission signal detection part 25, so that it is possible to notify the sub-card 2 of a time zone when a first CPU 11 of the master card 1 does not use a system bus 3 in accordance with a bus use permission signal Sand a bus use stop signal S, and to transmit plant data among the sub-cards 2 in the time zone. Thus, it is possible to validly use the spare time of the system bus 3, improve the using efficiency of the system bus 3, and reduce the load of the master card 1. |
