Structure Data Type Definitions

Structure Data Type Definitions - CompSpFlow

Overview

Structure data types serve as the major input and output data carriers between different function blocks, configuration, and parameterization data.

The following section lists the names of structures (data types) that are used in this function block, followed by a table that describes the elements of structure.

NOTE: For the structure data types that are used from this function block and others, refer to the Common Structure Data Type Definitions chapter.

Structure: stCompFlowInit

The stCompFlowInit structure data type contains the initialization data for the CompSpFlow function block.

Structure: stSwcAlrm

The stSwcAlrm structure is used to indicate the detected alarm states.

Element of stSwcAlrm	Data Type	Description
rSpMax	REAL	Defines the maximum value allowed for the calculated pressure setpoint.
siNbPnt	SINT	Defines the number of measuring points (stPntn) used (pressure setpoint values together with the respective flow values). At least 2 measuring points are required to use this function. Range: 2...6
esiCompTyp	enumeration SINT	Defines whether the setpoint values are relative or absolute values. Range: orelative (= 1) oabsolute (= 2)
stPnt1	stPnt	Structure defining the flow and pressure value for the measuring points. Refer to the structure data type stPnt.
stPnt2	stPnt
stPnt3	stPnt
stPnt4	stPnt
stPnt5	stPnt
stPnt6	stPnt

Structure: stPnt

The stPnt structure data type contains a flow and a pressure value. These values define one measuring point.

Element of stPnt	Data Type	Description
rX_Flow	REAL	Defines the flow value for the measuring point (iq_stCompFlowInit.stPnt(n)).
rY_Pres	REAL	Defines the pressure value for the measuring point. Range: oIf relative: 0...100% oIf absolute: i_rSp <=rY_Pres <=rSpMax

Element of stPnt

Data Type

Description

rX_Flow

REAL

Defines the flow value for the measuring point (iq_stCompFlowInit.stPnt(n)).

rY_Pres

REAL

Defines the pressure value for the measuring point. Range:

oIf relative: 0...100%

oIf absolute: i_rSp <=rY_Pres <=rSpMax

Structure: stCompFlowErr

The stCompFlowErr structure data type is used to indicate alarms or alerts.

Element of stCompFlowErr	Data Type	Description
stCompFlowAlrm	stCompFlowAlrm	Structure data type for detected alarms.
stCompFlowAlrt	stCompFlowAlrt	Structure data type for detected alerts.

Structure: stCompFlowAlrm

The stCompFlowAlrm structure data type is used to indicate a detected alarm:

Element of stCompFlowAlrm	Data Type	Description
xNuAlrm	BOOL	When TRUE, the value of the parameter defining the number of measuring points (stCompFlowInit.siNbPnt) is not within the allowed range (2...6).
xPntXValAlrm	BOOL	When TRUE, the same flow value has been detected more than once.
xPntXSeqAlrm	BOOL	When TRUE, it has been detected that the flow values in stPnt structure are not monotonically increasing.
xPntYSeqAlrm	BOOL	When TRUE, it has been detected that the pressure values in stPnt structure are not monotonically increasing.
xPntYHighLimAlrm	BOOL	When TRUE, it has been detected that the adjusted pressure setpoint has exceeded the maximum value. This parameter is available if relative values are used and if the Y value of the measuring point is greater than 100.0%. rY_Pres > 100.0%
xPntYLowLimAlrm	BOOL	When TRUE, it has been detected that the adjusted pressure setpoint is below the minimum value. This parameter is available if absolute values are used and if the Y value of the measuring point is less than the pressure setpoint. rY_Pres > pressure setpoint (i_rSp)

Structure: stCompFlowAlrt

The stCompFlowAlrt structure data type is used to indicate a detected alert.

Element of stCompFlowAlrt	Data Type	Description
xCalSpLimMaxAlrt	BOOL	When TRUE, it has been detected that the adjusted setpoint has exceeded the limit. Adjusted setpoint > value defined for stCompFlowInit.rSpMax.
xCalSpLimMinAlrt	BOOL	When TRUE, it has been detected that the adjusted setpoint is below the setpoint value. Adjusted setpoint < pressure setpoint (i_rSP).

Element of stCompFlowAlrt

Data Type

Description

xCalSpLimMaxAlrt

BOOL

When TRUE, it has been detected that the adjusted setpoint has exceeded the limit.

Adjusted setpoint > value defined for stCompFlowInit.rSpMax.

xCalSpLimMinAlrt

BOOL

When TRUE, it has been detected that the adjusted setpoint is below the setpoint value.

Adjusted setpoint < pressure setpoint (i_rSP).