SgxCalibration (FB)

FUNCTION_BLOCK SgxCalibration EXTENDS AbbLConC3

SgxCalibration function block is utilized to calibrate “ZERO”, “TARE” and “TWO_POINTS_CALIBRATION” to increase the precision of weighting

CalibrationType = “ZERO”, the rising edge of “Execute” signal will set the current weight as “ZERO”, an offset subtraction before export

CalibrationType = “TARE”, the rising edge of “Execute” signal will store the current weight(eg. packaging) to convert between “Gross” and “Net” weights

CalibrationType = “TWO_POINTS_CALIBRATION”, below three steps implements two-point calibration of the weight factor to boost measurement accuracy

Step 1: Use standard or calibrated object 1, then set “ReferenceWeight” as the first reference weight and “Index” = 0, with rising edge of “Execute” to get and return the actual measurement of reference point 1

Step 2: Replace with standard or calibrated object 2, then set “ReferenceWeight” as the second reference weight and “Index” = 1, with rising edge of “Execute” to get and return the actual measurement of reference point 2

Step 3: Finally, set “Index” = 2, with rising edge of “Execute”, the calibration data “scale” and “offset” will be calculated and stored internally

“Eeprom” is selectable between temporary storage and non-volatile data retention

A new calibration cycle is initiated by the rising edge of “Execute” signal

InOut:

Scope	Name	Type	Initial	Comment	Inherited from
Input	Enable	BOOL	FALSE	A rising edge (Enable = TRUE) starts the operation, the output Busy goes to TRUE. All other inputs are read and considered continuously. Execution will continue forever until a falling edge (Enable = FALSE) aborts the operation. During Aborting the Busy is still TRUE. Afterward all outputs are reset.	AbbLConC3
Output	Busy	BOOL	FALSE	Operation is running (while output Error is FALSE)	AbbLConC3
	Error	BOOL	FALSE	Operation is stopped with error (while output Busy is FALSE). This output is TRUE for at least one cycle or until Enable is set to FALSE. The output ErrorID gives more details about the error.	AbbLConC3
Input	Set	BOOL	FALSE	A rising edge starts a single operation of “ZERO”, “TARE” or a step of “TWO_POINTS_CALIBRATION”
	ChannelInputBase	POINTER TO ARRAY [0..3] OF WORD		Base address of strain gauge channel, mapped address of state
	ChannelOutputBase	POINTER TO ARRAY [0..3] OF WORD		Base address of strain gauge channel, mapped address of command
	Eeprom	BOOL	FALSE	Calibration data to be stored in data flash memory
	CalibrationType	Sgx_CALIBRATION_TYPE	Sgx_CALIBRATION_TYPE.NONE	Option of “ZERO”, “TARE” or “TWO_POINTS_CALIBRATION” calibration
	DigitalOutput	BOOL	FALSE	Imaged digital output field when “general digital output” is configured
	Index	Sgx_CALIBRATION_INDEX	Sgx_CALIBRATION_INDEX.REFERENCE_WEIGHT_1	Parameter ID or index of parameter of calibration data
	ReferenceWeight	DINT	0	Input reference weight
Output	CarryOut	BOOL	FALSE	Calibration state, 0 => calibration in progress; 1 => calibration is carried out
	ErrorID	ERROR_ID	ERROR_ID.NO_ERROR	Error code returned
	StateReturn	WORD	0	State returned, [0] => digital output state;[1] => Done; [8:10] => calibration type, 1 = ZERO, 2 = TARE, 4 = TWO_POINTS_CALIBRATION; [11] => Eeprom; [12:15] = 2
	IndexReturn	WORD	0	Index returned, valid as CalibrationType = “TWO_POINTS_CALIBRATION”
	DataCalibration	SgxParameterData		CalibrationData returned