Control2Seq

Control2Seq (FB)

FUNCTION_BLOCK Control2Seq

Short description

Sequence control with on/off thresholds for an analog input signal The action direction (inverted / direct) is also adjustable.

Representation

Interfaces

Inputs

Name	Data type	Value range	Initial value	Function
rIn	REAL			Analog input value

Outputs

Name	Data type	Value range	Initial value	Function
xY	BOOL			Binary output signal

Setpoints / parameters

Name	Data type	Value range	Initial value	Function
rSwitchOffPoint	REAL		3.0	Off threshold
rSwitchOnPoint	REAL		7.0	On threshold
eAction	eControlMode		eControlMode.Direct	Action direction of the sequence control (Inverted = heating, Direct = cooling)

Function description

Digital output xY

The digital output xY is influenced by the action direction eAction, the analog input value rIn and the two switching thresholds rSwitchOffPoint and rSwitchOnPoint affected. If the action direction eControlMode.Direct is selected, then the on threshold rSwitchOnPoint must be greater than the off threshold rSwitchOffPoint be. If the action direction eControlMode.Inverted is selected, then the on threshold rSwitchOnPoint must be less than the off threshold rSwitchOffPoint be.

eAction	rIn	xY	Notes
eControlMode.Direct	rIn < rSwitchOnPoint and rIn* > rSwitchOffPoint	unchanged	Action direction = Direct: Actual value does not exceed any thresholds
eControlMode.Inverted	rIn > rSwitchOnPoint and rIn* < rSwitchOffPoint	unchanged	Action direction = Inverted: Actual value does not exceed any thresholds
eControlMode.Direct	rIn >= rSwitchOnPoint	TRUE	Action direction = Direct: Actual value exceeds on threshold
eControlMode.Direct	rIn <= rSwitchOffPoint	FALSE	Action direction = Direct: Actual value falls below off threshold
eControlMode.Inverted	rIn <= rSwitchOnPoint	TRUE	Action direction = Inverted: Actual value falls below on threshold
eControlMode.Inverted	rIn >= rSwitchOffPoint	FALSE	Action direction = Inverted: Actual value exceeds off threshold

CODESYS

InOut:

Scope	Name	Type	Initial
Input	rIn	REAL
Input Const	rSwitchOffPoint	REAL	2
Input Const	rSwitchOnPoint	REAL	6
Input Const	eAction	eControlMode	eControlMode.Direct
Output	xY	BOOL