10
High Output
Low Output
Control
Output
Trip Point
Alarm On
Alarm Off
Alarm On
Alarm Off
Hysteresis
Hysteresis
High
Process
Low
Process
Process Variable
Hysteresis
Trip Point
Alarm On
Alarm Off
Alarm On
Alarm Off
Hysteresis
3.4
Set Up Alarms
Information.
• Four alarms per channel – identified A1 to D1 (for channel 1) up to A4 to D4 (for channel 4).
• Three operator acknowledge options.
• Global alarm acknowledgment – by digital input, alarm, logic equation result or real time event (if option fitted).
• High/low process alarms.
• High/low output alarms.
• High/low deviation alarms.
• Fast/slow rate of change – of process variable alarms.
• Adjustable hysteresis value – to prevent oscillation of alarm state.
• Time hysteresis – to allow delayed triggering of alarms.
…3
BASIC CONFIGURATION LEVEL
Fig. 3.3 High and Low Process with Hysteresis
Fig. 3.4 High and Low Output with Hysteresis