FP4, FP4W
49
11.4.1 Alarm
Fig. 11.7 An example
view of the 'Channel’ setting window – Alarm 1.
Mode: Disabled
(Disabled, Low, High)
[1]
Type: Alarm
(Alarm, Control)
[2]
Level: [None]
(value)
[3]
Hysteresis: [None]
(value)
[4]
Colour: Disabled
(Disabled, Green, Yellow, Red)
[5]
Output: --
(--, RL1, .., RL4)
[6]
Log event: Disabled
(Disabled, Enabled)
[7]
Change the frequency of archiving: Disabled
(Disabled, Enabled)
[8]
[1]: The threshold can be set to
High
(active above a specific level) or
Low
(active below
a specific level) operation mode.
[2]: Setting of the
Type: Alarm
(or so called latched mode) allows to indicate the alarm
notification with confirmation procedure.
Type: Control
(or so called non-latched
mode) allows to indicate the threshold status or use relays outputs to set a simple
on/off control (e.g. heating or cooling).
[3]: The alarm threshold level value is entered in the measured value units assigned.
[4]: The hysteresis value is the difference between the threshold value exceedance and
return to normal. The threshold hysteresis value is entered in units of the measured
value assigned to a specific measurement channel. For example, for a threshold set
to
High
, 48 °C threshold level and 0.5 °C hysteresis means that the threshold will be
exceeded above 48 °C, and will return to normal below 47.5 °C (48-0.5). For
a threshold set to
Low
, -
15 °C threshold level and 0.2 °C hysteresis means the
threshold will be exceeded below -
15 °C, and will return to normal above -14.8 °C
( -(15-0.2)).
[5]: Each alarm/control threshold can have a colour assigned. If the threshold is
exceeded, the measurement result is displayed in a different colour:
Green
,
Yellow
or
Red
(assigned to this alarm).
[6]: The drop down list enables selecting a suitable relay output.
[7]: Enabling the option switches on the archiving of the thresholds exceeded to the
event file.
[8]: The recording of measurement results can be controlled by alarm/control thresholds.
Two different recording speeds can be set. The exceeded threshold can switch from
