The Analog Alarm Module provides a mechanism to dynamically reconfigure alarm priorities and trip limits for analog points during process upsets, start-ups and shutdowns. Only significant alarms are annunciated allowing the operator to focus on the current situation.
- Manage individual trip points / priorities
- Manual / semi-automatic / automatic selector
- Periodic case enforcement
- Area access security
- Interface schematic displays
Alarm management is accomplished by modifying individual alarm parameters. Logically related alarm point parameters are grouped into analog alarm modules with a defi ned priority or trip point for each.
Modules are then linked together to provide the final application. These modules are dynamically activated through a selector that operates in manual, semi-automatic or automatic mode. The selector logic
determines which modules to activate in semi-automatic or automatic mode. The selector can also be configured to periodically enforce a module.
Built-in security prevents accidental use from other areas. Operator interface schematic displays provide module details, execution status and easy-to-use access to both selectors and analog alarm modules. These displays are accessed through a target subpicture that allows seamless integration with client schematic displays. Advanced features include time delays, links to other alarm and confi guration modules and event initiated processing.
Distributed control systems provide multiple alarm functions for virtually every input, many of which are alarmed. Many alarm points provide valuable precursor alarm information to help the operator contain
minor disturbances and prevent them from growing in severity. However, alarm points are only important when the associated equipment or process is in service.
- Equipment Failures: When a major piece of process equipment like a charge pump, compressor, or fired heater shuts down, most alarms become unnecessary. They indicate secondary, non-critical eff ects and no longer provide the operator with important information.
- Unit Start-ups and Shutdowns: During operating mode changes, many meaningless alarms are annunciated. The operator must search displays and determine which alarms are signifi cant. This wastes valuable time when the operator needs to make important operating decisions and take action.
With the intelligence of the Selector and the capabilities of the Analog Alarm Module, these situations can be better managed.