Specifications

Configuring Alarms for Points
PlantScape Server and Client Configuration Guide 161
Alarm Deadband for Analog Points
On the Alarm property sheet for an analog point you can specify an alarm
deadband so that an analog value (moving in and out of the alarm limit) will not
generate unwanted alarms.
To define a deadband, select a percentage value from the Alarm Deadband list.
Control Fail Alarms for Analog Points
When an analog point control is issued, the server tests for control failure as
follows:
• After an OP, SP, MD, or auxiliary parameter control is issued, a demand scan
on the source address is performed by the server. If the scanned value does
not match the controlled value, a control fail alarm is generated.
• If a control timeout and control deadband value have been defined on the
Control property sheet, a PV Fail Alarm will be generated when the PV fails
to match the SP. (See the description of “Control Deadband for Analog
Points” on page 151 and “Control Timeout for Analog Points” on page 152.)
You select an alarm priority and sub-priority for the control fail alarm on the
Alarms tab.
External Change Alarms for Analog Points
For analog points, you can configure alarms for external changes in PV, OP, MD,
and SP. For a detailed description of external changes and when alarms are
triggered, see “External Change Alarms for Status Points” on page 157.
Alarm Properties for Accumulator Points
Property See…
Alarm Type “Accumulator Point Alarm Types” on page 162.
Priority and Sub Priority “Defining Events, Alarms, and Alarm Priorities” on
page 162.
Limit “Accumulator Point Alarm Types” on page 162.
Disable Alarming “Disabling Alarming” on page 165.
plscpcg.book Page 161 Monday, May 28, 2001 10:11 AM