Yokogawa Value Series FX1000 - Manual (Page 83)

3-10 IM 04L21B01-01EN
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
Reset
Alarm ACK
Relay is activated on the next alarm occurrence
Alarm output relay
Alarm 2
Alarm 1
Activated
Alarm
occurrence
Alarm
occurrence
Deactivated
• Hysteresis > Meas CH
• High/Low
Sets the hysteresis width of the alarm occurrence/release of the high/low limit alarm
specified on measurement channels.
Selectable range: 0.0% to 5.0% of the span or scaling width
If you set a limit to a channel that is set to log scale (/LG1 option), the alarm
hysteresis will be fixed to 0%.
• Delta High/Low
Sets the hysteresis width of the alarm occurrence/release of the difference high/low
limit alarm specified on measurement channels.
Selectable range: 0.0% to 5.0% of the span
• Hysteresis > Math CH (/M1, /PM1, and /PWR1 options)
Sets the hysteresis width of the alarm occurrence/release of the high/low limit alarm
specified on computation channels.
Selectable range: 0.0% to 5.0% of the measurement span
3.5 Setting the Auxiliary Alarm Function