| 摘要 |
<p>A communications and control network includes a remote operations centre and a plurality of local control centres each interfacing with apparatuses in specified locations. Each apparatus is arranged to communicate through the electricity supply line (6) or by other means to its respective local control centre for permissions to operate. Operational circuits (17) and process control (15) are responsive to data defining capability sets (19) to determine whether a function selected is permitted.</p> |
