Rockwell Automation T6200 Compressor Anti-Surge and Capacity Controller - Manual (Page 71)

HMI-6200 Operator Interface
6-5
Event Information Processing
The following describes the information structure for alarm and alert handling and for trend and
historical recording
Alarm and Alert Definition –
The T6200 includes comprehensive detection and notification of alarms and alerts. Alarms are defined
as conditions which require user acknowledgement; alerts are records of actions/conditions for which
operator acknowledgement may or may not be specified (Ack is configuration selectable).
Alarm and Alert Detection –
For reliability and speed-of-response alarm and alert detection and processing takes place in the control
module of the T6200. All alarms and alerts are time-stamped upon detection.
Deterministic Alarming –
Deterministic alarms/alerts are generated by comparing the performance of combinations of discretes
and/or variables against pre-defined limits of alarmable conditions of operations. Practically unlimited
logic/math/selection functions are provided in the control module of the T6200 to allow for simple or
sophisticated alarm/alert interlocking.
Deterministic alarm configurations serve basically two purposes - 1) they can be used to advise or take
action based on the nature of alarm combinations or 2) deterministic alarming can also be used to
disregard alarms/events that are merely further effects of a fault that has already been recognized. Two
examples of combinational alarms would be:
- Do not generate a low flow alarm if a corresponding pump is turned off.
- Alarm on deviation of a process signal from a trip-point only if the rate of change or another variable
exceeds specification at the same time that certain valves are fully open and a feed pump is off.
Alarm and Alert Suppression –
Alarm and alert processing can be suppressed at the control module level. The configured suppression
may be for specific alarm/alert points or groups and is normally process condition related. Notification
of suppression is provided via alarm “cutout” attributes.
Alarm and Alert Notification –
The HMI-6200 (operation interface) provides several features for notification of alerts and alarms.
These include: HMI display, audible annunciation and optional control triggering.