Yokogawa Button Operated MV2000 - Manual (Page 14)

1-7 M-4660
Feature Overview
1
2
3
4
5
6
7
8
9
10
11
12
13
App
Index
Alarm display
Alarm conditions are indicated in operation windows (trend, digital, bar graph, overview,
etc.) and by icons in the status display section. The alarm summary displays detailed
alarm information.
• Hold/Nonhold of Indication
When alarm conditions cease, their indicators can be set to either:
• Stop as soon as the alarm condition ceases (Nonhold).
• Continue until the execution of an alarm output release (AlarmACK) operation (Hold).
The default setting is Nonhold.
For configuration instructions, see Section 3.5.
• Alarm Hide Function
If this function is enabled, the MV will not display alarm condition information or record
it in the alarm summary. However, the MV will output alarm information to a relay (/A
options) or internal switch. You can set this function for each channel and alarm.
For configuration instructions, see Section 3.6.
Alarm Output Relay Operation
The MV can generate a contact signal from an alarm output relay (/A options) when an
alarm occurs. The alarm output relay operation can be changed.
For configuration instructions, see Section 3.5.
Alarm
Alarm output relay
(reflash ON)
Alarm output relay
(reflash OFF)
Channel 1
Channel 3
Channel 2
Approx.
500 ms
Approx.
500 ms
Energize or De-energize
Non-Hold Hold
AND/OR
Alarm
Channel 1
AND
Channel 2
OR
Alarm output relay
or
Internal switch
NO
Energize
De-energize
C NC NO C NC NO C NC
NO C NC NO C NC NO C NC
When power is shut down
NO: Normally Opened
C: Common
NC: Normally Closed
Normal operation When alarm is occurring
Alarm
Alarm occurrence
Alarm occurrence
Alarm release
Alarm release
Alarm
output
relay
Alarm
Alarm
output
relay
AlarmACK
AlarmACK
or
or
or
Activated
Activated
Deactivated
Deactivated
Activated
Deactivated
AlarmACK
Activated
Deactivated
Activated
Deactivated
AlarmACK
Activated
Deactivated
AlarmACK
Activated
Deactivated
Reflash
(You can set the alarm output relay and internal
switch. For details on the internal switch, see the
next page.)
(when a relay is set to “OR” logic)
Relay is activated
at the next scan
interval
Relay is activated
at the next alarm
occurrence
Normal
Reset
Relay
Action on
AlarmACK
1.3 Alarms