ABB ControlMaster CM15 User Manual page 43

ControlMaster CM15
Universal process indicator
...Process Alarm / ... Alarm 1 (8)
Hysteresis
Time Hysteresis
Display Enable
Acknowledge
Source
Enable Source
IM/CM/I–EN Rev. D
1
/ DIN
8
Hysteresis trip level in engineering units. Activated at the alarm trip level but deactivated only
when the process variable has moved into the safe region by an amount equal to the hysteresis
value – see Process Alarm examples on page 39.
If an alarm trip value is exceeded, the alarm does not become active until the Time Hysteresis value
has expired. If the signal goes out of the alarm condition before the Time Hysteresis has expired,
the hysteresis timer is reset.
Enables an alarm to be used for control purposes without it appearing as an active alarm state in
the Operator level or Diagnostic view.
The source required to acknowledge all active alarms.
Acknowledge occurs on rising edge of the digital signal – see
Appendix A.1, page 76 for description of sources.
The source required to enable alarms. If the source is None, alarms are always enabled –see
Appendix A, page 76 for description of sources.
7 Advanced Level
Acknowledge
41