GE 845 Instruction Manual page 192

DEVICE
4–64
Path:
Setpoints > Device > Front Panel > Annunciator > Indicator 1 (36)
ALARM TYPE
Range: Off, Self-Reset, Latched
Default: Off
This setting specifies the alarm type. Self-Reset alarms track the state of the
corresponding input operand. Latched alarms can be reset using Reset pushbutton or
through Acknowledgement via graphical front panel.
The alarm type of each annunciator indicator may be configured as Off, Self-Reset, or
Latched. The default mode is Off. In this mode, the indicator is greyed out without any
text. In self-reset mode (Figure: Self-Reset Mode), the indicator's inactive state is by
default in black background with dark grey color text. When the associated operand
becomes active (i.e. the assigned FlexOperand is triggered), the configured background
color and foreground text color appears. In latched mode (Figure: Latched), the
configured operand causes the background to flash when it becomes active. If the
alarm is then acknowledged or reset, the background stops flashing. If the operand
becomes inactive, the indicator returns to its default colors. The behavior of these modes
conforms to ISA-18.1-1979 (R2004) standard - A-4-5-6 (self-reset), and M-6 (latched).
Figure 4-16: Self-Reset Mode
Figure 4-17: Latched Mode
Reset PB to
Acknowledge
AND
Operand ON
When any annunciator page is displayed with an alarm condition, the navigation keys
can be used to select an indicator. Once selected, the alarm condition can be
acknowledged by pressing the reset pushbutton or by pressing the enter key. A
confirmation message is displayed for acknowledging the alarm. Pressing the Reset or
Enter key again acknowledges the alarm and pressing the Escape button discards the
message. When the alarms are active under latched mode, a power loss retains the
previous state of the alarm as the alarm states are stored in non-volatile memory.
State: Normal
Visual: OFF
Reset PB to
Acknowledge
State: Abnormal
Visual: ON
State: Normal
Visual: OFF
Operand O N
Reset PB to
Acknowledge
AND
Operand OFF
Reset PB to
Acknowledge
AND
State: Abnormal
Operand O N
Visual: ON
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 4: SETPOINTS
State: Alarm
Visual: Fast-Flash