Yokogawa Button Operated MV2000 - Manual (Page 82)

3-8 M-4660
• Basic settings > Rate of change
• Decrease
Set the interval for the rate-of-change calculation of the low limit on rate-of-change
alarm by the number of sampled data points (1 to 32). The actual interval is
obtained by multiplying the value specified here by the scan interval.
• Increase
Set the interval for the rate-of-change calculation of the high limit on rate-of-change
alarm in the same manner as the interval for the low limit on rate-of-change alarm.
• Basic settings > Indicator
You can choose to make the alarm displays behave in the following ways.
Setting Description
Nonhold Stop when the alarm condition is released (return to normal condition).
Hold Continue until an alarm output release (AlarmACK) operation is performed.
• Switch, Relay
• Internal Switch > AND
Select the internal switches you want to set to AND logic. Select how many
switches after and including the first switch will be set to AND logic. All other
switches will be set to OR logic.
• Relay > AND
Select the relays you want to set to AND logic. Select how many relays after and
including the first alarm output relay will be set to AND logic. All relays after the
selected last relay 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 to energize or de-energize the alarm output relay when an alarm
occurs. This 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.
Setting Description
Nonhold Stop when the alarm condition is released (return to normal condition).
Hold Stay ON until an alarm output release (AlarmACK) operation is performed
Note
When reflash is turned ON, the operation of the first three output relays is fixed 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.
Setting Description
Normal The relay output is deactivated when the AlarmACK operation is executed. If the
condition for activating the alarm output relay is met in the next scan interval, the
relay output is activated.
The operation only applies when the alarm output relay is set to Hold.
Reset The relay output is deactivated when the AlarmACK operation is executed. If a
new condition for activating the alarm output relay is met, the relay is activated.
3.5 Setting the Auxiliary Alarm Function