4–62 889 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUALDEVICE CHAPTER 4: SETPOINTSALARM TYPERange: Off, Self-Reset, LatchedDefault: OffThis setting specifies the alarm type. Self-Reset alarms track the state of thecorresponding input operand. Latched alarms can be reset using Reset pushbutton orthrough Acknowledgement via graphical front panel.The alarm type of each annunciator indicator may be configured as Off, Self-Reset, orLatched. The default mode is Off. In this mode, the indicator is greyed out without anytext. In self-reset mode (Figure: Self-Reset Mode), the indicator’s inactive state is bydefault in black background with dark grey color text. When the associated operandbecomes active (i.e. the assigned FlexOperand is triggered), the configured backgroundcolor and foreground text color appears. In latched mode (Figure: Latched), theconfigured operand causes the background to flash when it becomes active. If thealarm is then acknowledged or reset, the background stops flashing. If the operandbecomes inactive, the indicator returns to its default colors. The behavior of these modesconforms to ISA-18.1-1979 (R2004) standard - A-4-5-6 (self-reset), and M-6 (latched).Figure 4-13: Self-Reset ModeFigure 4-14: Latched ModeWhen any annunciator page is displayed with an alarm condition, the navigation keyscan be used to select an indicator. Once selected, the alarm condition can beacknowledged by pressing the reset pushbutton or by pressing the enter key. Aconfirmation message is displayed for acknowledging the alarm. Pressing the Reset orEnter key again acknowledges the alarm and pressing the Escape button discards themessage. When the alarms are active under latched mode, a power loss retains theprevious state of the alarm as the alarm states are stored in non-volatile memory.State: NormalVisual: OFFState: AbnormalVisual: ONOperand ONOperand O FFReset PB toAcknowledgeState: NormalVisual: OFFState: AbnormalVisual: ONOperand ONOperand O FF State: AlarmVisual: Fast-FlashReset PB toAcknowledgeANDOperand ONReset PB toAcknowledgeANDOperand OFFReset PB toAcknowledgeANDOperand ON
