| 摘要 |
<p>A bus control system of CNC using a multi-master bus and having a back panel. The back panel is provided with sub-buses, and some of the printed boards (5, 10) are connected to the multi-master bus (1) through the sub-buses to constitute a hierarchical bus structure. The CPUs of printed boards (5, 10) having no frequent need for direct access to the multi-master bus (1) are arranged to access the multi-master bus via the sub-buses. Therefore, the processors on the printed boards (5, 10) are connected through the sub-buses to those on the printed boards (2, 9) directly connected to the multi-master bus (1), so that the abuse of the multi-master bus (1) is avoided.</p> |
