Yokogawa Removable Chassis DX1000N - Manual (Page 18)

1-7
IM 04L41B01-01E
Overview of Functions
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App
Index
• Energize or De-energize Operation
You can select whether the alarm output relay is energized or de-energized when an
alarm occurs. If de-energized is selected, the status of the alarm output relay when an
alarm occurs is the same as the status that results when the DX power is shut down.
The setting applies to all alarm output relays.
• Non-Hold/Hold
The alarm output relay can be set to operate in the following fashion when the alarm
condition is no longer met.
• Turn OFF the relay output (non-hold).
• Hold the relay at ON until the alarm ACK operation is executed (hold).
The setting applies to all alarm output relays.
• Alarm ACK Operation
The alarm acknowledge (alarm ACK) operation releases all alarm indications and
relay outputs. For the action of alarm indication and alarm output relay when you
carried out the alarm ACK operation, see the previous page.
• Individual Alarm ACK Operation (Only on DXs with the /AS1 advanced
security option)
This operation releases the relay output of individual alarms. This operation is referred
to as “individual alarm ACK.” For information about how alarm display and output
relay operations respond to an individual alarm ACK, see the previous page. You can
perform individual alarm ACK from the overview display.
For operating instructions, see section 4.4.
Note
When you enter the basic setting mode, the hold/non-hold condition of the alarm output relay
immediately before is retained. In the basic setting mode, alarms are not detected, and you
cannot acknowledge alarms.
Internal Switch
The alarm status can be output to software switches (30 internal switches). The values of
the internal switch are shown below. Like the alarm output relay, you can specify AND/
OR operation (see the previous page). The internal switches cannot be operated other
than for alarm output.
Alarm
Alarm occurrence
Alarm release
Internal switch
1
0
The internal switches can be used events of the event action function (see section 1.6).
In addition, the internal switches can be written in calculation expressions of computation
channels (/M1 or /PM1 option).
1.2 Alarms