DCS alarm value setting issue
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The DCS alarm messages are numerous, complex, and chaotic; there is a lot of irrelevant information that interferes with the normal operations of DCS operators. Many useful alarms cannot be detected or resolved in a timely manner. I would like to ask for advice on how to set things up and organize these alerts.
It can be distinguished by the alarm sound and the font color of the alarm message:
Can’t detect it in time? For example.
Contact the process management personnel to redefine the upper and lower limits for the process parameters, and remove any unnecessary alarm parameters. DCS alarms should not occur frequently; if they do, it indicates that there is a problem……
If the device originally has upper and lower limits set, and it keeps emitting alarms after being disabled, how should these limits be set?
Turn off the alarm for this point directly on the DCS, or set it to a verification status to generate a false signal. But be sure to remember to reply in a timely manner when the device is activated.
In consultation with the process operators, and based on the urgency level, the DCS configuration makes use of the alarm suppression function to temporarily silence those that are \"not urgent\" for a certain period of time.
This can be achieved through logic; for example, the device being out of service can serve as a condition for suppressing alarms.
You can add a hand console! It’s sufficient to display the main alarms on the console and add audible and visual alerts! For other process value alarms, it’s necessary to carefully evaluate the process!
I work in process engineering and am not very familiar with instruments. Do you mean that parameters such as the temperature and liquid level of a distillation tower can be incorporated along with pump signals in the programming? For pumps A and B, if a low liquid level alarm is to be implemented, which one of them needs to be in operation? Will a low-level alarm be displayed only if the liquid level is below the low limit AND either pump A or pump B is running?
I think it can be done like this: 1. DCS has alarm priority levels; we use Honeywell systems, and three permission levels for emergencies—high, medium, and low—are set up for separate management. For important alarms, set the alarm level higher to enable operators to detect them promptly. 2. For alarms that require special attention, a separate photon card is set up for alarm confirmation. 3. For interlock-related functions, control can be achieved through logical or program configuration to reduce the occurrence of alarms. (Example: The setpoints for high and low level alarms are set at a wider range than the interlock action values; no interlock based on high/low level alarms is used, and control is achieved through logic.) 4. Meaningless alarm cancellation. 5. For cases where significant fluctuations cause repeated alarms at the upper and lower limits, a delay should be set. (Example: The wind pressure fluctuates greatly; occasionally it exceeds the alarm threshold, and the alarm is triggered after a 5-second delay, etc.)