| 摘要 |
A local logic solver operates with a local smart valve controller to control and test a local field-mounted emergency isolation valve device to which provide a local indication of trouble on the device, which is mounted in the field away from the facility's central control panel for the process. Accordingly, the operation of the overall system is simplified by eliminating the need for an external computer to diagnose any problems. A local control panel includes an indicator light substantially adjacent to or in close proximity to the device being monitored to alert personnel of detected faults. Detected faults are time-stamped locally to provide documentation and tracking of elapsed time, starting when the degraded state of the device was detected and first signaled as a problem.
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