Yokogawa Button Operated DX2000 - Manual (Page 17)

1-6
IM 04L42B01-01E
• Alarm Hide Function
The alarm setting is displayed, but no indication is made when an alarm occurs. The
alarm is also not recorded in the alarm summary. The alarm is output to the relay
(/A[ ] option) or internal switch. This function can be set for each channel and each
alarm.
For the setting procedure, see section 3.6.
Alarm Output Relay Operation
Contact signals can be generated from alarm output relays (/A_ option) when alarms
occur. The alarm output relay operation can be changed.
For the setting procedure, see section 3.5.
Alarm
Alarm output relay
(Reflash on)
Alarm output relay
(Reflash off)
Channel 1
Channel 3
Channel 2
Energize or De-energize
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 an alarm
is occurring
Alarm
Normal
Alarm
Normal
Reflash
(You can set AND/OR for the alarm output relay and internal
switch. For details about the internal switch, see the next
page.)
(when a relay is set to OR logic)
Normal
Reset
Relay
Action on
ACK
Relay
Action on
ACK
Occurrence
Activated
Deactivated
Activated
Deactivated
Activated
Deactivated
Release
or
Activated
Deactivated
or
Display
Alarm
Hold
Non-hold
Alarm output relay
Hold
Non-hold
Hold
Non-hold
Non-hold/Hold
Relay is activated
at the next scan
interval.
Relay is activated
when the next
alarm occurs.
Alarm ACK Alarm ACK
500 ms, 1 s, or 2 s
1.2 Alarms