Yokogawa Value Series FX1000 - Manual (Page 23)

2-10
IM 04L21B01-64EN
Alarm
Four alarms (Alarm 1 to 4) can be specified on each channel.
Type
Select H, L, h, l, R, r, T or t. The selectable alarms vary depending on the input mode
and computation type. For details, see chapter 3 in the FX User’s Manual.
Alarm value and exponent
Alarm is generated using the specified value as the boundary. The selectable range of
alarm values vary depending on the input mode and range.
For channels that are set to [LogType1] or [LogType2], set the value by specifying the
mantissa and exponent. Enter the mantissa under [Value].
Alarm Relay
Specify the internal switch or output relay that will be used to generate alarms.
Otherwise, select [None].
Detect
This can be selected when [No Logging] is turned [ON] under [Alarm] - [Alarm action] in
the [Basic Setting] tab.
Select whether to show or hide the alarm indication when an alarm occurs. If set to [OFF],
a signal is output to the alarm output relay or internal switch when an alarm occurs, but it
is not indicated on the screen. The alarm is also not recorded in the alarm summary.
Alarm delay
Set the alarm delay time to an integer value from 1 to 3600 s. If the measured value
remains above or below the set alarm value for the set period of time (the delay time),
an alarm is activated.
Note
FX specifications
• The alarm delay time takes on a value that is an integer multiple of the scan interval. For
example, if the alarm delay time is set to 5 s when the scan interval is 2 s, the actual delay
time is 6 s.
• The delay alarm has the following special operations.
• If the computation is stopped in a condition in which the computed value is exceeding the
alarm setting when a delay alarm is set on a computation channel, the alarm is turned
On after the specified period (delay period) elapses.
• The alarm detection operation is reset if a power failure occurs. The operation restarts
after the power recovers.
• If the alarm setting of the delay high limit alarm is changed when an alarm is already
activated and the input is greater than or equal to the new setting, the alarm continues.
For all other cases, the alarm detection operation starts at the new setting. This is also
true for the delay lower limit alarm.
2.3 Setting the Measurement Channels