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All Rights Reserved. Copyright © 2000, Yokogawa Electric Corporation
TI 04L01A01-02E
3.2
Alarm Function
Number of alarm levels
: Up to four alarm levels for each channel.
Alarm Types
H High limit alarm
: Generated when the measured value is higher than, or equal
to, the alarm setting.
L Low limit alarm
: Generated when the measured value is lower than, or equal
to, the alarm setting.
R Rate-of-change limit on increase
: Generated when the measured value variation in the
ascending direction during a selected interval is greater than,
or equal to, the alarm setting.
r Rate-of-change limit on decrease
: Generated when the measured value variation in the
descending direction during a selected interval is greater than,
or equal to, the alarm setting.
h Difference upper limit alarm
: Generated when the difference between two channels is equal
to or greater than the alarm setting.
l Difference lower limit alarm
: Generated when the difference between two channels is equal
to or less than the alarm setting.
T Delayed high limit alarm : Generated when the measured value is higher than, or equal
to the alarm setting and spend specified time.
t Delayed low limit alarm : Generated when the measured value is lower than, or equal
to the alarm setting and spend specified time.
Hysteresis
: On (0.5% of span, effective for high and low limit alarms) / off switchable,
common for all channels.
Alarm indication
Status indicator section
: Displayed in the status display area (upper section of the screen)
Trend display
: Displayed in the numeric display section.
Numeric display
: Displays the measured values of the channel on which the alarm is being
generated in red.
Bar graph display
: Displays the alarm condition of the channel on which the alarm is being
generated. Also displays the alarm point marker. Displays the measured values
In red.
Indication behavior
Indication hold
: When alarm occurs, red box keeps blinking until Alarm Ack is executed.
If Alarm Ack is executed during alarm in effect, red box changes from red blink
to red light on.
When alarm is released before Alarm Ack is executed, green box blinks.
Indication non-hold
: Red light turns on during alarm in effect.
Display does not change by Alarm Ack.
Output contacts
: When the alarm output relay option is installed, the alarm can be output to the
relay.
off
Blink in
red
Turn on
red
off
Blink in
green
Blink in
red
off
Alarm
Alarm ACK
Indication on
status section
Indication hold
Alarm
off
Blink in
red
Turn on red
off
off
Indication non-hold
Indication on
status section