Function Block Description

Function Block Description - CompSpFlow

Pin Diagram

Brief Description

The CompSpFlow function block helps to maintain a constant pressure even at the highest and/or most distant points of the system. To achieve this, the pressure setpoint (i_rSP) is adapted according to the flow value provided by the flow meter to reduce friction loss.

I/O Variables Description

The table describes the input/output variables of the function block:

Input/Output	Data Type	Description
iq_stAlrmCtrl	stAlrmCtrl	Structure used for alarm handling. Refer to the structure data type description.
iq_stOpMode	stOpMode	Determines the operating modes. If the element xAuto of the structure data type stOpMode is set to TRUE, the function block executes its tasks automatically. With another status of this element, the outputs of this function block are set to their defined fallback (default) states. Refer to the structure data type description.
iq_stCompFlowInit	stCompFlowInit	Structure used for initialization data for the CompSpFlow function block. Refer to the structure data type description.

Input/Output

Data Type

Description

iq_stAlrmCtrl

stAlrmCtrl

Structure used for alarm handling. Refer to the structure data type description.

iq_stOpMode

stOpMode

Determines the operating modes.

If the element xAuto of the structure data type stOpMode is set to TRUE, the function block executes its tasks automatically. With another status of this element, the outputs of this function block are set to their defined fallback (default) states. Refer to the structure data type description.

iq_stCompFlowInit

stCompFlowInit

Structure used for initialization data for the CompSpFlow function block.

Refer to the structure data type description.

The table describes the input variables to the function block:

Input	Data Type	Description
i_xRele	BOOL	Activates (TRUE) or stops (FALSE) the execution of the function block.
i_rSp	REAL	Contains the user-defined pressure setpoint. This constant setpoint is considered during startup (pipe fill function) of the pumping process. It is adjusted by this compensation function and by other functions of this library. Range: 0.0...n
i_stAna_Flow	stAna	Structure for analog values, contains the flow input value and the state of this value. Refer to the structure data type description.

Input

Data Type

Description

i_xRele

BOOL

Activates (TRUE) or stops (FALSE) the execution of the function block.

i_rSp

REAL

Contains the user-defined pressure setpoint. This constant setpoint is considered during startup (pipe fill function) of the pumping process. It is adjusted by this compensation function and by other functions of this library.

Range: 0.0...n

i_stAna_Flow

stAna

Structure for analog values, contains the flow input value and the state of this value.

Refer to the structure data type description.

The table describes the output variables from the function block:

Output	Data Type	Description
q_stRef_Sp	stRef	Contains the adapted pressure setpoint and the state of this value. Refer to the structure data type description.
q_stCompFlowErr	stCompFlowErr	Structure that indicates the alarm and alert states detected by the CompSpFlow function block. Refer to the structure data type description of alarms.

Output

Data Type

Description

q_stRef_Sp

stRef

Contains the adapted pressure setpoint and the state of this value.

Refer to the structure data type description.

q_stCompFlowErr

stCompFlowErr

Structure that indicates the alarm and alert states detected by the CompSpFlow function block.

Refer to the structure data type description of alarms.