Control2Seq (FB)¶

FUNCTION_BLOCK Control2Seq

Short Descritpion¶

Sequence control with switch-on/switch-off threshold for an analog input signal

The direction of the action (inverted / direct) is also adjustable.

Portrayal¶

Interfaces¶

Inputs¶

Name
Datatype

Range

Init-Value

Function

rIn REAL
Analog input value

Outputs¶

Name
Datatype

Range

Init-Value

Function

xY BOOL
Binary output signal

Setpoints / Parameters¶

Name
Datatype

Range

Init-Value

Function

rSwitchOffPoint REAL 3.0
Switch-off threshold

rSwitchOnPoint REAL 7.0
Switch-on threshold

eAction eControlMode eControlMode.Direct
Direction of action of sequence control (inverted = heating, direct = cooling)

Functional Description¶

Digital output xY¶

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

eAction rIn xY
Notes

eControlMode.Direct rIn < rSwitchOnPoint und rIn* > rSwitchOffPoint
unchanged

Direction of action = Direct: actual value doesn’t exceed thresholds

eControlMode.Inverted rIn > rSwitchOnPoint und rIn* < rSwitchOffPoint
unchanged

Direction of action = Inverted: actual value doesn’t exceed thresholds

eControlMode.Direct rIn >= rSwitchOnPoint TRUE
Direction of action = Direct: actual value exceed switch-on thresholds

eControlMode.Direct rIn <= rSwitchOffPoint FALSE
Direction of action = Direct: actual value fallen below switch-off thresholds

eControlMode.Inverted rIn <= rSwitchOnPoint TRUE
Direction of action = Inverted: actual value fallen below switch-on thresholds

eControlMode.Inverted rIn >= rSwitchOffPoint FALSE
Direction of action = Inverted: actual value exceed switch-on thresholds

Visualization¶

Information¶

Element
Authors

Date
Version
Notes

Function
Alexander Halter 08.2016 1.0
Initial version

Programming
Alexander Halter 08.2016 1.0
Initial version

Test Jochen Reu 11.2017 1.0
Initial version

Documentation
Jochen Reu 11.2017 1.0
Initial version

Codesys¶

InOut:

Scope	Name	Type	Initial	Comment
Input	rIn	REAL		Analog input value
	rSwitchOffPoint	REAL	3	Switch-off threshold
	rSwitchOnPoint	REAL	7	Switch-on threshold
	eAction	eControlMode	eControlMode.Direct	Direction of action of sequence control (inverted = heating, direct = cooling)
Output	xY	BOOL		Binary output signal