West Control Solutions 8700+ - Manual (Page 145)

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Glossary 59305, Issue 7 – March 2014
Exceed Condition Type: Limit Controller Definition
A state that occurs when the Process Variable exceeds the Limit Setpoint value. E.g. if the
PV is above the Limit SP when set for high limit action, or below the Limit SP for low limit
action. The Limit Controller will shut down the process when this condition occurs, and
cannot be reset until the Exceed Condition has passed.
Also refer to Annunciator, Exceed Time, Latching Relay, Limit Controller, Limit Hysteresis
and Limit Setpoint.
Exceed Time Type: Limit Controller Definition
The total accumulated time that a Limit Controller has been in the Exceed Condition since
this parameter was last reset.
Also refer to Elapsed Time, Exceed Condition and Limit Controller.
Indicator Type: Indicator Definition
An instrument that can display a Process Variable. Alarm outputs are available that will
activate at preset PV values. Relay outputs can be selected to have a Latching function
similar to a Limit Controller output, but indicators do not have the necessary approvals for
safety critical applications. Other options are PV retransmission and Serial Communications.
Process control functions are not available.
Also refer to Alarm Operation, Controller, Elapsed Time, Latching Relay, Limit Controller,
Multi-Point Scaling, Process Variable, Retransmit Output, Serial Communications, Tare.
Input Filter Time Constant Type: General Parameter
This parameter is used to filter out extraneous impulses on the process variable. The filtered
PV is used for all PV-dependent functions (display control, alarm etc). The time constant is
adjustable from 0.0 seconds (off) to 100.0 seconds in 0.5 second increments.
Display code =

, Default value = 2.0 seconds.
Also refer to Process Variable.
Input Range Type: General Definition
This is the overall process variable input range and type as selected by the

parameter
in Configuration Mode.
Also refer to Input Span.
Input Span Type: General Definition
The measuring limits, as defined by the Scale Range Lower and Scale Range Upper Limits.
The trimmed span value is also used as the basis for calculations that relate to the span of
the instrument (E.g. controller proportional bands)
Also refer to Input Range, Scale Range Lower Limit and Scale Range Upper Limit.
Integral Type: Controller Tuning Parameter
Refer to Automatic Reset.
Latching Relay Type: General Definition
A type of relay that, once it becomes active, requires a reset signal before it will deactivate.
This output is available on Limit controllers and indicator alarms. To successfully deactivate a
latched relay, the alarm or limit condition that caused the relay to become active must first be
removed, then a reset signal can be applied. This signal may be applied from the instrument
keypad, Digital Input or command via Serial Communication.
Also refer to Alarm Operation, Indicator, Limit Controller, Limit Hysteresis, Serial
Communications.