• Alarms – DCS have sophisticated alarming conventions
• Alarm Hi HiHi, Lo, LoLo, etc, as well as rate of change.
• Alarms should have dead band to prevent chatter, on and off at the same point due to noise.
• Configured in a priority manor with different sounds colored schemes
• Can be suppressed, example during a startup, shutdown sequence.
• Acknowledge in the console display where the variable is configured, forces the operator to pay attention to the variable's operation
• Alarm history file can be analyzed by an off line software program to sort by various attributes.