| 摘要 |
<p>PROBLEM TO BE SOLVED: To evade malfunction when operation commands from a plurality of portable operation terminals to the same plant equipment collide against each other. SOLUTION: A plant control system is equipped with a controller 2 which controls plant equipment and a portable operation terminal 1 which sends an operation command signal for the plant equipment to the controller 2 by radio, and the controller 2 gives control right to one of the plurality of portable operation terminals 1 and responds to only an operation command signal from the portable operation terminal 1 having the control right to control the plant equipment. Consequently, even if the plurality of operation commands collide against each other, the operation command from a terminal 1 which does not have the control right is ignored, so malfunction of the plant equipment is evaded.</p> |
