Yokogawa Button Operated DX2000 - Manual (Page 104)

3-8
IM 04L42B01-01E
• Switch, Relay
• Internal Switch > AND
Select the internal switches that are to operate using AND logic. Set the range
of internal switches (from the first internal switch) to take the AND logic. All
subsequent switches will be set to OR logic.
• Relay > AND
Select the relays that are to operate using AND logic. Set the range of relays (from
the first alarm relay) to take the AND logic. All subsequent relays will be set to OR
logic. Available settings are
None, I01 (I01 only), I01-I02 (I01 and I02), I01-I03 (I01
to I03), etc. Only alarm output relays that are installed are valid.
Note
When reflash is turned ON, the operation of the first three output relays is fixed to OR logic.
Specifying
AND produces no effect.
• Relay > Action
Select whether the alarm output relay is energized or de-energized when an alarm
occurs. The setting applies to all alarm output relays.
• Relay > Hold
You can choose to make the alarm output relays behave in the following ways. This
setting applies to all relays. When you use the alarm annunciator function (release
number 3 or later), the setting follows the annunciator sequence.
Settings Description
Nonhold Turns the output relay OFF when the alarm condition is released (returns to
normal condition).
Hold Holds the output relay at ON until an alarm acknowledge operation is performed.
Note
When reflash is turned ON, the operation of the first three output relays is set to nonhold.
Specifying
Hold produces no effect.
• Relay > Relay Action on Ack
You can select the relay output status that is enabled after the AlarmACK operation
from the following two settings. When you use the alarm annunciator function
(release number 3 or later), the setting follows the annunciator sequence.
Settings Description
Normal The relay is deactivated when the alarm ACK operation is executed. If the
condition for activating the alarm output relay is met in the next scan interval, the
relay is activated.
This operation is valid only when the alarm output relay is set to Hold.
Reset The relay is deactivated when the alarm ACK operation is executed. If a new
condition for activating the alarm output relay is met, the relay is activated.
An example of the relay action when alarm ACK is executed is shown below. This
example is for the case when the output relay AND item is set to None.
Normal
Alarm ACK
Alarm output relay
Alarm 2
Alarm 1
Relay is activated in the next scan interval
Activated
Alarm
occurrence
Alarm
occurrence
Deactivated
3.5 Setting the Auxiliary Alarm Function