Yokogawa Removable Chassis DX1000N - Manual (Page 108)

3-14 IM 04L41B01-01E
• Alarm > Relay
Select whether to turn On or Off the relay output.
• Alarm > No.
Set the output relay number or internal switch number when performing relay output.
• Alarm > Detect
This item appears when the alarm hide function (see section 3.6) is turned On. 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,
and alarms are not displayed by the alarm annunciator (release number 3 or later).
• Alarm delay > Time (for delay high/low limit alarms)
Set the alarm delay time using an integer in the range of 1 to 3600 s.
On DXs with the /AS1 advanced security option, you can set the delay time to a value
within the range of 1 to 3600 seconds or 1 to 24 hours.
Note
• 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.
• Alarm delay > Unit (For delay high/low limit alarms)
This setting is only available on DXs with the /AS1 advanced security option. Set the
unit of the alarm delay time. You can select seconds or hours.
• Alarm display > Level (Release number 3 or later)
When multiple alarms occur, the display of alarms with higher levels is given higher
priority. This setting applies to all channels.
Setting Description
1>2>3>4 The order of alarm level preference, from highest to lowest preference, is 1,
2, 3, 4.
1>4>2>3 The order of alarm level preference, from highest to lowest preference, is 1,
4, 2, 3.
1>4>3>2 The order of alarm level preference, from highest to lowest preference, is 1,
4, 3, 2.
• Alarm display > Color (Release number 3 or later)
Determines the alarm color for each alarm level. This setting applies to all channels.
Item Setting
1 Sets the alarm level 1 color to red, orange, yellow, or pink.
2 Sets the alarm level 2 color.
3 Sets the alarm level 3 color.
4 Sets the alarm level 4 color.
3.7 Setting Alarms on Channels