| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent operation commands from plural operator stations from overlapping to a field controls station. SOLUTION: When a field control station 11 receives an access right request from an operator station 31 with an operation unit (Tag No) of a controller, an auxiliary device, etc., it gives the access right of the Tag No only to the station 11 that makes the access request, gives the other operator stations a message showing that the Tag No is not accessible and performs exclusive control over the same Tag No.</p> |
