| 摘要 |
The distributed process control system has a number of geographically located zones (12,14)and bidirectional communication is made using satellite link (18) channels (20,22). Each zone has an inter zone server computer (32,56) and this together with data bases (30,54) and user interfaces (28,52) connect over LAN networks (34,58) with process controllers (24,26,50). |
