The Dynamic Management (DM) module provides the capability to manage the states and state transition of control system settings according to any set of logic. The DM module allows for both macro and micro configuration and provides a dynamic mechanism to reconfigure the system for start-ups, shutdowns and operating mode changes. Alarm and non-alarm parameters can be configured; therefore, the configuration of control and alarm points is always appropriate for the current operating state. Plant processes are dynamic by nature. The DM module gives you the capability to control your process and its alarms through every process state with accuracy and confidence.
DM is a powerful process management tool that allows the alarm configuration to change as the operating state changes. Therefore, it can effectively eliminate alarm floods during upset conditions, and operators can focus on stabilizing the plant rather than responding to unnecessary alarms. DM also includes transition management to help enable alarms to activate only as needed during a process mode change. This prevents critical alarms from being missed during a flood and insures alarms are available upon startup.
DM delivers the control you need to meet larger operational objectives like never before. The logic tools provided as a part of DM make logic implementation or changes simple, fast and easy to follow. Loop logic can be changed and implemented in a fraction of the time with greater robustness without the use of cumbersome proprietary code.
Every alarm in the Master Control System Database (MCSD) can be configured to change when the plant changes state (case). In order to determine which case the selected system is currently in, DM uses a variety of real-time readings from instruments, valve positions and other systems’ operating statuses. By using key parameters to determine the operating state for a system, alarm fl oods are minimized with no operator assistance required.
In addition to alarm suppression on case change, the DM module has intelligent enabling built-in. Without intelligent enabling present, minor alarm floods could occur on operating mode change due to some process variables responding slower or faster to a change in operating mode. As shown below, the clear-to-enable and delay timers allow alarms to follow their normal operating path without having an alarm sounding unless it’s an abnormal condition. With clear-to-enable and delay timers on parameters that are being changed from case to case, there will not be any more nuisance alarms annunciating before the process variable has time to adjust to the case change.
Dynamic management logic is configured through an easy-to-use drag and drop interface. Each case can be created using any of the parameters in the control system. Using the logic blocks given, the user can create any case determinacy logic required. The Dynamic Management module includes case transition logic as well. In order to prevent cases from chattering, the logic includes deadbands and indeterminacy rules.
From an operator’s perspective, everything has already been configured and implemented behind the screen. The operator will not have to perform any actions in order for DM to function. The DM module will follow key process parameters and suppress any alarms that will be irrelevant to the operator depending on which operating state he is in. The operator will be able to access helper screens to see the current status of the DM module and verify that all of the instruments are reading correctly. If the operator believes too many instruments are reading incorrect or are unreliable, he will have the ability to push a system into a ‘Default’ case which has no dynamic management enabled.
Engineers will be able to use the above interface to configure each system and their respective cases based upon the process conditions. They will also be able to change the alarm configuration based upon
the operating condition. Because the DM module has controlled access, it can be configured so that an engineer for unit A will not be able to edit the DM for unit B.