TFloatSignal, unit ObjectSignals.pas

 

Component that represent analog signal in system.

 

PROPERTIES

 

Alarm: TAlarmProperties

This property object that is used for signal alarm setup. It has next properties:

 

Property	Type	Predefined	Description
HiAlarmEnabled	Boolean	False	Defines either high alarm is active or not
HiAlarmMessage	String		Message that is shown when alarm occurs
HiAlarmWave	String		Path to wav file to be played when alarm occurs
HiLimit	Float	100	High limit value
LoAlarmEnabled	Boolean	False	Defines either low alarm is active or not
LoAlarmMessage	String		Message that is shown when alarm occurs
LoAlarmWave	String		Path to wav file to be played when alarm occurs
LoLimit	Float	0	Low limit value
Level	Integer	0	Alarm level
ShowDialog	Boolean	True	Defines either alarm message is to be shown or not
SaveToDataBase	Boolean	True	Enables or disables saving to data base
HiAlarmSignal	TBooleanSignal	False	Link to Boolean signal linked to High alarm event. True if  EUvalue>=HiLimit.
LoAlarmSignal	TBooleanSignal	False	Link to Boolean signal linked to High alarm event. True EUvalue<=LoLimit.

 

ConvertProperties: TConvertProperties

This property object that is used for signal conversion setup. It has next properties:

 

Property	Type	Predefined	Description
ConvertStatus	ConvertStatus	csNone	This property defines if and how conversion will be done. Possible values are: -csNone – no conversion -csLinear – convert value to EUvalue (and vice versa) by proportional function -csSquare – convert value to EUvalue (and vice versa) by square function -csSquareRoot – convert value to EUvalue (and vice versa) by square root  function -csUser – user type of conversion. It has two events: o   RawToEUEvent o   EUToRawEvent These functions are executed when ConvertStatus is set to csUser.
EUUnits	String		Engineer units name (L, m3, 0C, ...). It can be used by  visual components.
HighEU	Float	100	Upper EUvalue (maximal value if signal is clamped)
HighRawData	Float	100	Upper raw value
LowEU	Float	0	Lower EUvalue (minimal value if signal is clamped)
LowRawData	Float	0	Lower raw value

 

OnChangeRange: double

Defines amount of signal EUvalue change to trigger OnChange event. Its value can be from 0 to1 (for example: 0.15 represents 15% from EU range).

 

TagName: String

Auxiliary mark that is used for compatibility with standard marks that are used in process. It is used to label signal name in technological schemas.

 

Value: double

Variable that contains raw signal value that is taken from source (OPC server and other sources). In addition, this variable is used to proceed value to source (OPC server).

 

EUValue: double

Variable that contains EU signal value that is a result of RowToEU conversion function.. In addition, this variable is used to proceed value to source (OPC server).

 

Filter: double

Low band filter. Its value can be between 0 and 1, where zero means there is no filtration, and 1 means that there are no

changes.  Amount of filtration directly depends on speed of signal value refreshing (refresh rate depends on process timer that is used in module where signals are defined)

 

Clamp: booleanboolean

If this property is set to True, EUValue will be clamped to HighEU and LowEU when raw value overrides its limit values..

 

AsString: string

Returns Value of the signal as string value (formatted as it is defined by Format property)

 

AsInteger: integer

Returns Value of the signal as integer value.

 

AsFloat: double

Returns Value of the signal as float value.

 

EUAsString: string

Returns EUValue of the signal as string value (formatted as it is defined by Format property).

 

EUAsInteger: integer

Returns EUValue of the signal as integer value.

 

EUAsFloat: double

Returns EUValue of the signal as float value.

 

EVENTS

 

OnRawToEUConvert: TRawToEUEvent

This user function will be executed every time when raw value is changed and ConvertStatus is set to csUser. Programmer sets his own conversion function.

 

OnEUToRawConvert: TEUToRawEvent

This user function will be executed every time when EUValue is changed and ConvertStatus is set to csUser. Programmer sets his own conversion function.