Control2Seq

Control2Seq (FB)

FUNCTION_BLOCK Control2Seq

Short description

Sequence control with switch-on / switch-off threshold for an analog input signal The action sense (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	Switch-off threshold
rSwitchOnPoint	REAL		7.0	Switch-on threshold
eAction	eControlMode		eControlMode.Direct	Action sense of the sequence control (Inverted = Heating, Direct = Cooling)

Function description

Digital output xY

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

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