By Bill Hollifield, Eddie Habibi
During this moment version, Alarm administration: A finished consultant, a number of difficulties of alarm platforms are lined with unique information on how they arrive approximately and the way to successfully right them. it's written by means of people with substantial event within the diverse vegetation, procedures, and environments requiring powerful alarm administration. the second one version is full of sturdy examples and factors of approaches, with functional lists and pointers on how one should still continue. it truly is in line with countless numbers of profitable tasks.
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As an example, it is a common but poor practice to simply change the color of a process value on a graphic to indicate it has come into alarm. ) The indicator is multiply coded with fill color, a unique shape, and a text designation. 1 psi Suppressed Alarm Figure 4-1: Multiply Coded Alarm Indication Elements Chapter 4–Common DCS and SCADA Alarm Display Capabilities— and Their Misuse 31 Graphics should contain no gratuitous animation elements. It is proper, however, for the alarm indicator to blink for a new, unacknowledged alarm as an attention-getting device.
Absurd? Yes—in an airliner—because people have made intelligent rules about proper cockpit practices and procedures. A plant operator, when managing process upsets, has many similarities to this pilot. Unfortunately, a typical DCS alarm system has many alarms similar in uselessness, with as much negative and distractive effect as this interruption by the flight attendant! Remember, the Alarm Summary Screen is not the control engineer’s dumping ground for miscellaneous status information! In all of these cases, the important principles apply: • Alarms must require an operator response.
The best practice is to use three primary levels of annunciated DCS alarm priority. Your DCS may allow many more than that. Do not succumb to the temptation of using them! Humans are wonderfully able to put things in three categories and to understand items in three categories. Four or five categories are about the maximum; more than that will get cognitively blurred together and become confusing rather than helpful. (Quick! ) Alarm systems from different DCSs may have differing nomenclature for priority levels.