Yokogawa Value Series FX1000 - Manual (Page 17)

1-8
IM 04L21B01-01EN
• Energize or De-energize Operation
You can select whether the alarm output relay is energized or de-energized 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. 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.
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).
Internal switches can also be written into computation channel (/M1, /PM1, and /PWR1
options) equations.
1.2 Alarms