1.3 Alarms

Non-Hold/Hold Operation of Alarm Output Relays

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 output until the alarm ACK operation is executed (hold). The setting applies to all alarm output relays.

The default setting is non-hold.

Non-hold

Alarm occurrence

Alarm Alarm release

Activated

Alarm output

relay Released

 

 

 

 

Hold

 

 

Alarm

 

 

Alarm Alarm

 

 

ACK

 

 

ACK ACK

 

 

 

 

or

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

or

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Note

If the reflash alarm is enabled, I01 to I03 are fixed to non-hold operation. Specifying Hold produces no effect.

If diagnosis output is enabled, I01 is fixed to non-hold operation. Specifying Hold produces no effect.

<Related Topics>

Setting the non-hold/hold operation of alarm output relays: Section 7.1

Alarm ACK Operation

The alarm acknowledge (alarm ACK) operation releases all alarm indications and relay outputs (/A1, /A2, and /A3 options) that are activated when the alarm indication or alarm output relay is set to hold operation. This operation can be executed from the front panel key.

<Related Topics>

Alarm ACK operation: Section 3.12

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Omega RD100B manual Alarm ACK Operation, Alarms Non-Hold/Hold Operation of Alarm Output Relays