Yokogawa Button Operated MV2000 - Manual (Page 17)

1-8
IM MV1000-01E
• Reflash
This function enables a single alarm output relay with multiple alarms assigned to it to
indicate all alarm occurrences. After the first alarm, subsequent alarms are indicated
by the brief release (approximately 500 ms) of the output relay.
The reflash function affects the first three output relays.*
* I01 to I03 or I11 to I13. With the /A1 option, I01 and I02.
Note
When reflash is enabled, the first three output relays are used exclusively as reflash relays.
The first three output relays are set to OR logic and to the Nonhold operation regardless of the
AND/OR or Nonhold/Hold settings explained below.
• AND/OR
When multiple alarms are assigned to one output relay, you can choose to activate the
alarm in one of the following ways (you can also use AND/OR with internal switches):
• AND: Activate the relay when all of the alarms assigned to it occur simultaneously.
• OR: Activate the relay when any of the alarms assigned to it occur.
• Energze or De-energze Operaton
You can choose whether to energize or de-energize alarm output relays when an
alarm occurs. If you select de-energize, the alarm output relays will be in the same
state when the power is shut off as they are when an alarm occurs. This setting
applies to all alarm output relays.
• Nonhold/Hold
When an alarm condition is no longer met, alarm relays can be set to:
• Turn OFF immediately (Nonhold).
• Remain ON until the execution of an alarm output release (AlarmACK) operation (Hold).
This setting applies to all alarm output relays.
• Alarm Output Release Operaton
The alarm output release operation (AlarmACK) stops the display and the relay output
of all alarms. For information about how alarm display and output relay operations
respond to an AlarmACK operation, see the previous page.
Note
When you enter Basic Setting Mode, the alarm output relay remains at its current active/
released state. In Basic Setting Mode, alarms are not detected and the AlarmACK operation is
invalid.
Internal Swtch
The MV can transmit the alarm status to software switches (30 internal switches).
Internal switch values are shown below. As with AlarmACK, you can apply an AND or OR
operation (see the previous page).
Alarm
Alarm occurrence
Alarm release
Internal switch
1
0
Internal switches can be used as events with the event action function (for details, see
section 1.7). Internal switches can also be written into computation channel (/M1 and
/PM1 options) expressions.
1.3 Alarms