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System Documentation
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Design Considerations - index
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Electrical Noise and Wiring Practices


DOE-HDBK-1132-99
DCSs offer a single, unified, system-wide global database and superior peer-to-
peer communications. By virtue of their configurations, PLCs require a third-
party, PC-based software package (which is generally included with the PLC) to
provide the user with a working operator interface.
DCS offers single source, system-wide support through available service
contracts with dedicated field service personnel. On the other hand, PLC
manufacturers generally do not provide total system service, especially when a
facility uses different PLC manufacturers. The user should support the system or
find a qualified system integrator to provide similar service and support.
Hybrid PLC-DCS control systems may be considered where DCS provides
analog control and operator interface, and PLC provides digital control for motor
and air operated valves, etc.
Alarm Management . The following guidelines for alarm selection strategy should be
4.4
considered:
Provide a systematic approach for identifying, verifying, prioritizing, and
documenting the requirements for process alarms.
Provide capability of alarm pattern recognition and suppression of alarms by
group, status, function, or mode.
Provide an alarm only when the operator is required to take action to avert an
abnormal event. Other information and status can be presented to the operator
in the form of an alert or advisory notice, but should not sound an alarm. Alarms
should be presented to the operator in an organized and optimized manner to
reduce the confusion caused by multiple alarms.
To prevent a single event from causing a cascading of alarms, report alarms
hierarchically to the operator.
Provide capability to advise the operator of the appropriate response to an alarm
or to trigger an automatic response.
II-45


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