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8-3. Alarm Settings “Alarm”
Various alarm points can be set for measured value of each channel. Up to four alarm points per channel can be set and
the type of alarm (upper/lower, diff upper/lower, or rate-of-change upper/lower) can be set to each alarm point arbitrarily.
Using the alarm settings, alarm printing, alarm display, status LED indication and relay output can be performed.
Alarm output (relay output) provides up to 12 points when option is used.
1. Display and print at alarm activation/reset
When alarm is activated, the “ALM” status LED and measured value of the channel generating the alarm will start
flashing.
Pressing the
key displays details of the alarm and a list of active alarms.
Also, “alarm type”, “alarm level” and “alarm activation time” of the alarm generating channel are printed at the far
right of chart, and “alarm level” and “alarm reset time” are printed when the alarm is reset.
The maximum number of printing tasks of alarm activation/reset held by the unit is 48. Further printing tasks of
alarm activation/reset cannot be accumulated. When 48 is exceeded,
▲
mark is printed right at the level.
Reset
(1) Time (2) CH (3) – (hyphen) (4) Level
Activated
(1) Time (2) CH (3) Alarm type (4) Level
2. Alarm setting parameters
The alarm function does not work initially since it is not set prior to shipment.
1) Alarm point (alarm type and alarm value)
Alarm type (upper/lower, diff upper/lower or rate-of-change upper/lower) and alarm point can be set for up
to four levels per channel at arbitrary points.
2) Alarm
deadband
Alarm is activated when a measured value
reaches an alarm value (see right figure).
Alarm reset point can be set at a point toward
the normal range, and the area between the
alarm activation and reset points is called
alarm deadband.
The setting range is the same as the scale
setting.
3) Compared CH (for diff upper/lower alarm only)
Specify a comparison target CH when using diff upper/lower alarm.
4) Reference period (for rate-of-change upper/lower alarm only)
Specify a period for comparing the amount of change.
(See the next section for alarm type.)
5) Delay
Output delay time (Delay) can be set for each channel and level. Alarm is activated when a specified delay
time passes after alarm condition is detected. If the alarm condition is cleared during the delay period,
alarm will not be activated.
Example:
Lower alarm
Deadband
(Activated)
(Reset)
Alarm value
MIN
MAX
Upper alarm
ON
OFF
Deadband
(Activated)
(Reset)
Alarm value
MIN MAX
ON
OFF
(1) (2) (3) (4)
Example of chart printing at alarm
activation
