Yokogawa Removable Chassis DX1000N - Manual (Page 121)

Measurement Channels and
Alarms
IM 04L41B01-01E
3-27
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App
Index
3.12 Using the Alarm Annunciator Function (Release number 3 or later)
ISA-A
Sequence diagram
Process
Sequence
Display
Relay output
Alarm icon
Normal
Normal
Normal
Deactivated
No display
Process
Sequence
Display
Relay output
Alarm icon
Deactivated
Process
Sequence
Display
Relay output
Alarm icon
Activated
Abnormal
Acknowledged
On
On (red) Blinking (red)
Flashing
Alarm
Abnormal or
normal
To abnormal
Return to normal
Alarm ACK
while abnormal
Alarm ACK
while normal
Sequence pattern
Alarm
Display
Relay output
Alarm ACK Alarm ACK
• If an alarm is released before the alarm ACK operation is performed, the annunciator blinks with the color that is displayed
when no alarms are activated.
• If an alarm is released before the alarm ACK operation is performed, the alarm icon blinks green.
When multiple alarms have been assigned to a single annunciator window
• If multiple alarms are occurring, the window is displayed using the color of the alarm with the highest priority.
When two alarms have been assigned to a single relay
When the relay is set to OR logic
ACK ACK
Relay hold
Alarm A
Occurrence
Alarm B
Occurrence
Release
Release
Relay
Activated
Deactivated
An alarm has occurred so the relay has been activated.